Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Satoshi Hamai Last modified date:2020.06.29

Associate Professor / Faculty of Medical Sciences


Papers
1. Keisuke Komiyama, Satoshi Hamai, Satoru Ikebe, Kensei Yoshimoto, Hidehiko Higaki, Kyohei Shiomoto, Hirotaka Gondo, Daisuke Hara, Yifeng Wang, Yasuharu Nakashima, In vivo kinematic analysis of replaced hip during stationary cycling and computer simulation of optimal cup positioning against prosthetic impingement, Clinical Biomechanics, 10.1016/j.clinbiomech.2019.05.035, 68, 175-181, 2019.08, Background: Dynamic hip kinematics during stationary cycling after total hip arthroplasty (THA) have been unclear. Furthermore, no computer simulation of optimal cup position based on in vivo kinematics has yet been assessed. Methods: This study consisted of 7 patients who underwent unilateral primary THA for symptomatic osteoarthritis. Using a flat-panel X-ray detector, continuous radiographs were obtained during stationary cycling. We analyzed the three-dimensional replaced hip kinematics from the top to the bottom position of the crank using image-matching techniques and quantified minimum liner-to-stem neck distance. Simulation analyses with in vivo kinematics were performed to examine patient-specific optimal cup placement against prosthetic impingement. Findings: During stationary cycling, pelvis showed 27.1° of posterior tilt on average without significant change. Hip flexed by 59.4° and 19.3° on average at the top and bottom positions, respectively. Minimum liner-to-neck distance was 8.8 mm on average at the bottom position. Liner-to-neck, bone-to-bone, or bone-to-component impingement was not observed at any positions in any hips. Simulation analysis of cup placement showed that larger cup anteversion, inclination, and use of elevated liner significantly decreased the minimum distance between posterior liner and stem neck. Cup anteversion of more than 30° with elevated liner could cause posterior liner-to-neck impingement at bottom position. Interpretation: Stationary cycling after THA provides no excessive hip range of motion or liner-to-neck contact. Cup placement and use of elevated liner significantly influence the minimum liner-to-neck distance, in some cases simulating posterior prosthetic impingement..
2. Masato Kiyohara, Satoshi Hamai, Daisuke Hara, Daisuke Fujiyoshi, Satoru Harada, Kenichi Kawaguchi, Yasuharu Nakashima, Do component position and muscle strength affect the cup-head translation during gait after total hip arthroplasty?, European Journal of Orthopaedic Surgery and Traumatology, 10.1007/s00590-019-02443-1, 29, 6, 1263-1269, 2019.08, Introduction: This study examined whether the component position or muscle strength affects the cup-head translation under in vivo weight-bearing conditions after total hip arthroplasty (THA). We hypothesized that there was a correlation between the hip offset or abductor strength and cup-head translation during gait. Materials and methods: We prospectively evaluated 31 patients undergoing unilateral cementless primary THA. The cup height, cup/stem offset, and limb length discrepancy were measured on anterior–posterior bilateral hip radiographic images. The isometric muscle strength of the lower limbs was quantified using a handheld dynamometer. Continuous radiographic images were recorded during gait, and cup-head translation was analysed using a computer-assisted method. Results: The average cup height, cup/stem offset, and limb length discrepancy were − 3.8 ± 5.1 mm, 1.2 ± 5.2 mm/− 0.7 ± 7.7 mm, and − 2.1 ± 5.2 mm, respectively. The average hip abductor/flexor and knee extensor strength were 86% ± 18%/85% ± 17% and 88% ± 17% of the contralateral healthy hip, respectively. The average cup-head translation during swing phase of gait was − 0.003 ± 0.31 mm. Multiple regression analyses found no significant independent predictors of cup-head translation (p > 0.05). Conclusions: The component position or muscle strength did not significantly influence cup-head translation during gait after well-positioned primary THA..
3. Koichiro Kawano, Goro Motomura, Satoshi Ikemura, Yusuke Kubo, Junichi Fukushi, Satoshi Hamai, Masanori Fujii, Yasuharu Nakashima, Long-term hip survival and factors influencing patient-reported outcomes after transtrochanteric anterior rotational osteotomy for osteonecrosis of the femoral head
A minimum 10-year follow-up case series, Modern Rheumatology, 10.1080/14397595.2018.1558917, 30, 1, 184-190, 2020.01, Objectives: This retrospective study aimed to assess long-term hip survival after transtrochanteric anterior rotational osteotomy (ARO) for osteonecrosis of the femoral head (ONFH) and identify factors influencing patient-reported outcome measures (PROMs) in patients with preserved joints. Methods: Altogether, 95 consecutive hips in 85 ONFH patients who underwent ARO during 2000–2007 (86.7% follow-up) were studied. Controls were 35 patients with 41 hips with ONFH managed conservatively for >1 year after collapse. We analyzed hip survival using the Kaplan–Meier method, with the endpoint defined as any therapeutic surgery related to ONFH. We also evaluated PROMs for both groups in patients with surviving hips and available radiographs at the final follow-up. Results: The 10-year hip survival rate after ARO was 85.4%, which was significantly higher than the 5-year rate in the control group (50.4%). Multiple regression analyses showed that the presence of osteoarthritic change after ARO was significantly associated with poor scores for both the Oxford Hip Score and the Short Form-12 Health Survey Physical Component Summary. Conclusions: ARO could effectively preserve hip joints with post-collapse ONFH, although the presence of osteoarthritic change could lead to lower satisfaction even among patients with long-term hip survival after ARO..
4. Kensei Yoshimoto, Satoshi Hamai, Hidehiko Higaki, Hirotaka Gondoh, Kyohei Shiomoto, Satoru Ikebe, Daisuke Hara, Keisuke Komiyama, Yasuharu Nakashima, Dynamic hip kinematics before and after periacetabular osteotomy in patients with dysplasia, Journal of Orthopaedic Science, 10.1016/j.jos.2019.03.019, 25, 2, 247-254, 2020.03, Background: We prospectively analyzed the hip kinematics in patients with developmental dysplasia of the hip (DDH) before and after periacetabular osteotomy (PAO) and in healthy subjects while squatting to determine the influence of coverage of the femoral head on hip kinematics. Methods: 14 hips in 14 patients with DDH and 10 hips in 10 volunteers were included. Continuous radiographs while squatting and computed tomography images were obtained to assess the in vivo kinematics of the hip and the rim-neck distance using density-based 3D-to-2D model-to-image registration techniques. Results: The maximum hip flexion angles were 100.4° and 94.9° before and after PAO (p = 0.0863), respectively. The maximum hip flexion angles after PAO did not significantly differ from those of normal hips (102.2°; p = 0.2552). The hip abduction angles at maximum hip flexion were 31.7° and 26.2° before and after PAO (p = 0.1256), respectively. The rim-neck distance decreased from averaged 12.2 mm–8.9 mm (p = 0.0044) after PAO. The lateral center edge angle (LCEA) and anterior center edge angle (ACEA) significantly improved 14.7°–42.4° and 50.4°–54.0° after PAO (p < 0.0001, p = 0.0347), respectively; in particular, the ACEA after PAO did not significantly differ from that in the normal hips (p = 0.1917). The ACEA was not correlated with hip flexion, or the rim-neck distance (p = 0.9601, 0.8764). The LCEA was also not correlated with hip abduction (p = 0.1683). Conclusion: Patients after PAO showed no significant difference in maximum hip flexion while squatting compared to before PAO and normal hips. Horizontalized weight-bearing acetabulum with normalized ACEA could be adequate correction of the acetabular fragment to restore hip RoM without coxalgia that induce the inability to perform squats after PAO..
5. Kenji Kitamura, Masanori Fujii, Takeshi Utsunomiya, Miho Iwamoto, Satoshi Ikemura, Satoshi Hamai, Goro Motomura, Mitsugu Todo, Yasuharu Nakashima, Effect of sagittal pelvic tilt on joint stress distribution in hip dysplasia
A finite element analysis, Clinical Biomechanics, 10.1016/j.clinbiomech.2020.02.011, 74, 34-41, 2020.04, Background: Physiologic pelvic tilt can change acetabular orientation and coverage in patients with hip dysplasia. In this study, we aimed to clarify the impact of change in sagittal pelvic tilt on joint stress distribution in dysplastic hips. Methods: We developed patient-specific finite element models of 21 dysplastic hips and 21 normal hips. The joint contact area, contact pressure, and equivalent stress of the acetabular cartilage were assessed at three pelvic tilt positions relative to the functional pelvic plane: 10° anterior tilt, no tilt, and 10° posterior tilt. Findings: The mean contact area was 0.6–0.7 times smaller, the mean maximum contact pressure was 1.8–1.9 times higher, and the mean maximum equivalent stress was 1.3–2.8 times higher in dysplastic hips than in normal hips at all three pelvic positions. As the pelvis tilted from 10° anterior to 10° posterior, the mean contact area decreased, and the mean maximum contact pressure and median maximum equivalent stress increased. The latter two changes were more significant in dysplastic hips than in normal hips (total increment was 1.3 MPa vs. 0.4 MPa, P = 0.001, and 3.6 MPa vs. 0.4 MPa, P < 0.001, respectively). The mean equivalent stress increased in the anterosuperior acetabulum during posterior pelvic tilt in dysplastic and normal hips, while the change was not significant in the superior and posterosuperior acetabulum in both groups. Interpretation: Sagittal pelvic tilt alters the loading environment and joint stress distribution of the hip joint and may impact the degeneration process in dysplastic hips..
6. Tetsuya Tachibana, Masanori Fujii, Kenji Kitamura, Satoshi Ikemura, Satoshi Hamai, Goro Motomura, Jun ichi Fukushi, Yasuharu Nakashima, Modified lateralized head sign
An accurate marker in diagnosing adult hip dysplasia, Journal of Orthopaedic Science, 10.1016/j.jos.2019.05.015, 25, 3, 460-465, 2020.05, Background: Although lateralized head sign (LHS) is considered indicative of structural instability, it lacks reproducibility, and its usefulness in diagnosing adult hip dysplasia is unknown. In this study, we proposed a modified LHS and aimed to determine its reliability and accuracy in diagnosing adult hip dysplasia. Methods: We reviewed anteroposterior pelvic radiographs of 94 patients (134 hips) with hip dysplasia. As controls, 133 normal hips were evaluated. We defined the modified lateralization distance (LD) as the horizontal distance between the medial aspect of the femoral head to the acetabular fossa. The sensitivity, specificity, and cutoff value of modified LD in diagnosing hip dysplasia were calculated using receiver operating characteristic curve analysis. Results: The sensitivity and specificity of the modified LD (79% and 87%, respectively) were higher than those of the conventional LD (63% and 80%, respectively). Diagnostic accuracy was further improved when patients were divided on the basis of sex. The sensitivity and specificity of the modified LD in men were 89% and 97%, respectively, with a cutoff value of 12 mm, while in women, they were 80% and 96%, respectively, with a cutoff value of 9.7 mm. Therefore, we defined the modified LHS as presentation with a modified LD ≥ 12 mm in men and ≥10 mm in women. Between three observers, the kappa value for intraobserver reliability was ≥0.9, while that for interobserver reliability was >0.8. The mean sensitivity and specificity of the modified LHS in diagnosing hip dysplasia were 85% and 99%, respectively. Conclusions: Modified LHS—a horizontal distance between the medial aspect of the femoral head and the acetabular fossa ≥12 mm in men and ≥10 mm in women—is a clinically useful marker in detecting lateral femoral head subluxation indicative of hip dysplasia or structural hip instability..
7. Kyohei Shiomoto, Satoshi Hamai, Goro Motomura, Satoshi Ikemura, Masanori Fujii, Yasuharu Nakashima, Influencing Factors for Joint Perception After Total Hip Arthroplasty
Asian Cohort Study, Journal of Arthroplasty, 10.1016/j.arth.2019.12.039, 35, 5, 1307-1314, 2020.05, Background: Perceiving replaced joints as natural is one of the best scenario after total hip arthroplasty (THA). We investigated the distribution of and influencing factors for patient's joint perception after THA in Asian cohort, which is not well known. Methods: We mailed a questionnaire to Asian patients who had undergone THA in our institution between 2012 and 2016, and this study included 318 Asian patients. The questionnaire assessed patient's joint perception, Oxford Hip Score (OHS), Short Form-12 Health Survey (SF-12) physical, mental, and role component summaries, and satisfaction score. Leg length discrepancy and global femoral offset before and after THA were measured using radiographs. The patients were divided into 2 groups with patient's joint perception: natural and artificial perception groups. OHS, SF-12, satisfaction, leg length discrepancy, and global femoral offset were compared between natural and artificial perception groups, and which factors significantly influenced joint perception were determined. Results: Of the 318 patients, 165 patients (51.8%) perceived their replaced joint as a natural joint. OHS, SF-12 physical and role component summaries, and satisfaction score in natural perception group were significantly higher than those in artificial perception group, without significant difference in SF-12 mental component summary. Multivariate analysis showed that less of usual pain, easier to get in or out of a car, and osteoarthritis in the contralateral hip were positively associated with natural joint perception after THA. Conclusion: This study indicated to surgeons that pain relief and improvement in getting in or out of a car after THA could lead to even better patient's joint perception..
8. Kyohei Shiomoto, Satoshi Hamai, Daisuke Hara, Hidehiko Higaki, Hirotaka Gondo, Yifeng Wang, Satoru Ikebe, Kensei Yoshimoto, Keisuke Komiyama, Satoru Harada, Yasuharu Nakashima, In vivo kinematics, component alignment and hardware variables influence on the liner-to-neck clearance during chair-rising after total hip arthroplasty, Journal of Orthopaedic Science, 10.1016/j.jos.2019.05.012, 25, 3, 452-459, 2020.05, Background: There is an interest in quantifying dynamic hip kinematics before and after total hip arthroplasty (THA) during chair-rising: one of daily life activities. Methods: The study consisted of 21 patients who underwent unilateral total hip arthroplasty for symptomatic osteoarthritis. We obtained continuous radiographs using a flat-panel X-ray detector while the participants rose from chair. We assessed the pre and postoperative hip joint's movements using three-dimensional-to-two-dimensional model-to-image registration techniques. We also measured minimum liner-to-neck distances at maximum hip flexion and extension as anterior and posterior liner-to-neck distances, respectively. Multivariate analyses were applied to determine which factors were associated with liner-to-neck distances. Results: The cup inclination, cup anteversion, and stem anteversion averaged 37.4°, 23.1°, and 30.1°, respectively. Significantly larger maximum hip flexion angle (72°) was found during chair-rising after THA compared to that before THA (63°, P < 0.01). The anterior pelvic tilt at the maximum hip flexion after THA (3° of anterior tilt) was significantly (P < 0.05) anterior compared to that before THA (1° of posterior tilt). The anterior and posterior liner-to-neck distances averaged 12.3 mm and 8.1 mm, respectively, with a significant difference (P < 0.01). No liner-to-neck contact was found in any hips. In multivariate analysis, the hip flexion angle, cup inclination, stem anteversion and head diameter were significantly associated with the anterior liner-to-neck distance (P < 0.05), the hip extension angle, cup anteversion, neck length and with or without elevated rim were significantly associated with the posterior liner-to-neck distance (P < 0.05, 0.01, 0.05, 0.01, respectively). Conclusion: This study indicates that well-positioned THA provide increased range of hip flexion with sufficient anterior liner-to-neck clearance during chair-rising. Dynamic hip kinematics, component position, and hardware variables significantly influenced on the liner-to-neck clearance under weight-bearing conditions..
9. Norio Goto, Yukio Akasaki, Ken Okazaki, Umito Kuwashima, Kenyu Iwasaki, Hideya Kawamura, Hideki Mizu-uchi, Satoshi Hamai, Hidetoshi Tsushima, Shinya Kawahara, Yasuharu Nakashima, The influence of post-operative knee coronal alignment parameters on long-term patient-reported outcomes after closed-wedge high tibial osteotomy, Journal of Orthopaedics, 10.1016/j.jor.2020.01.042, 20, 177-180, 2020.07, Background: Both intra-articular and extra-articular knee alignment pathologies can affect clinical outcomes after high tibial osteotomy. The purpose of this study was to investigate post-operative knee coronal alignment parameters that affect long-term patient-reported outcomes after closed-wedge high tibial osteotomy (CW-HTO). Methods: This study included 105 osteoarthritic knees that underwent CW-HTO. Long-term patient-reported outcomes were defined by the 2011 Knee Society Score (KSS) and were collected at an average follow-up of 10.2 years. Post-operative knee coronal alignment parameters, consisting of the femoral tibial angle (FTA), lateral distal femoral angle (LDFA), medial proximal tibial angle (MPTA), tibial plateau inclination (TPI), and joint line convergence angle (JLCA), were measured using standing radiographs of the knee at an average follow-up of 11.0 months. The correlations between these parameters and KSS were then assessed by Spearman's correlation analysis. Comparisons of groups classified by MPTA and TPI cutoff values were performed by the Wilcoxon rank-sum test. Results: Post-operative JLCA showed a significant negative correlation with two KSS sub-scores: satisfaction (R = −0.2232, P = 0.022) and total function (R = −0.2059, P = 0.035). There was no significant difference in any KSS sub-score between the “low” groups (MPTA and TPI less than 95 and 5°, respectively) and the “high” groups (MPTA and TPI greater than 98 and 7°, respectively). Conclusions: Among knee coronal alignment parameters, a large post-operative residual JLCA, which is an intra-articular varus deformity, was independently associated with worsened long-term clinical outcomes after CW-HTO. Level of evidence: Level Ⅳ, Retrospective cohort study..
10. Masato Kiyohara, Satoshi Hamai, Hirotaka Gondo, Hidehiko Higaki, Satoru Ikebe, Tetsuro Ushio, Koji Murakami, Yasuharu Nakashima, Tibiofemoral kinematics in healthy and osteoarthritic knees during twisting, Journal of Orthopaedics, 10.1016/j.jor.2020.03.051, 21, 213-217, 2020.09, Purpose: The purpose of this study was to determine the in vivo kinematics of healthy knees and those with osteoarthritis (OA), during twisting using density-based image-matching techniques. Methods: Five healthy subjects and 26 patients with medial knee OA performed twisting under periodic X-ray imaging. Results: The tibiofemoral rotation at the ipsilateral/contralateral twist in healthy and OA knees were 11° ± 9.3° externally/9.5° ± 5.6° internally (p < 0.05) and 4.4° ± 7.2° externally/2.7° ± 8° internally (p < 0.05), respectively. Conclusions: The kinematic analysis of OA knees during twisting revealed significantly smaller tibiofemoral rotation than those of healthy knees..
11. Yukio Akasaki, Hideki Mizu-uchi, Satoshi Hamai, Hidetoshi Tsushima, Shinya Kawahara, Tomohiro Horikawa, Yasuharu Nakashima, Patient-specific prediction of joint line convergence angle after high tibial osteotomy using a whole-leg radiograph standing on lateral-wedge insole, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-019-05821-8, 2019.01, Purpose: To assess the usefulness of a whole-leg radiograph standing on lateral-wedge insole (LWI) for predicting the change in joint line convergence angle (JLCA) before vs. after high tibial osteotomy (HTO). Methods: Forty knees with medial osteoarthritis underwent open-wedge HTO. Pre-operatively, all patients had whole-leg radiographs taken in three different conditions: supine, standing, and standing on LWI inclined at 20°. A standing whole-leg radiograph was also obtained post-operatively. Radiological measurements including JLCA and percentage of mechanical axis (%MA) were compared. Using pre-operative radiographs, correction angles were calculated with the target %MA at 62.5%. Correlations between the difference in calculated correction angle among the three pre-operative conditions and the change in JLCA before vs. after HTO were assessed. Results: In the pre-operative standing conditions, the mean JLCA of 3.8° was significantly decreased to 3.2° using LWI, which did not differ from post-operative JLCA of 3.1°. Mean %MA significantly shifted laterally from 20.6 to 24.8% using LWI, and was strongly correlated with the change in JLCA (coefficient, 0.83). Calculated correction angles differed significantly among the three pre-operative conditions. The difference in calculated correction angle between standing with and without LWI was strongly correlated to the change in standing JLCA before vs. after HTO (coefficient, 0.73). Conclusion: Larger differences in calculated correction angles between pre-operative radiographs standing with and without LWI predicted larger changes in JLCA after HTO. Whole-leg radiograph standing on LWI is a promising modality for correct pre-operative planning considering patient-specific changes in JLCA before vs. after HTO. Level of evidence: IV..
12. Kenta Momii, Satoshi Hamai, Goro Motomura, Kensuke Kubota, Masato Kiyohara, Takuaki Yamamoto, Yasuharu Nakashima, Revascularization of the necrotic femoral head after traumatic open anterior hip dislocation in a child
A case report, Journal of Medical Case Reports, 10.1186/s13256-019-2192-7, 13, 1, 2019.08, Introduction: Avascular necrosis of the femoral capital epiphysis is the most serious complication after traumatic dislocation of the hip in children. This case report discusses the localization and revascularization of the necrotic femoral head following rarely experienced traumatic open anterior hip dislocation in children. Case presentation: Our patient was an 11-year-old Japanese boy who had open anterior hip dislocation sustained in a traffic accident. Reduction of the hip joint was performed in an emergency operation, and he was evaluated using serial gadolinium-enhanced magnetic resonance imaging. T1-weighted magnetic resonance images showed two bands with low signal intensity in the femoral capital epiphysis on coronal and oblique axial planes, indicating the existence of avascular osteonecrosis of the femoral head. We observed gadolinium enhancement in the central region of the epiphysis, where the area between the two bands with low signal intensity was located. Serial assessment with enhanced magnetic resonance images during a non-weight-bearing period of 1.5 years after injury showed revascularization starting from the central region and converging toward the peripheral region. Although the patient had leg-length discrepancy due to the early epiphyseal closure, non-weight-bearing treatment for the avascular osteonecrosis of the femoral head achieved a favorable outcome without any hip joint dysfunction, pain, or sign of secondary osteoarthritic change within 4.5 years after injury. Conclusion: We confirmed the revascularization process of the necrotic lesion in the femoral capital epiphysis in an 11-year-old boy using serial gadolinium-enhanced magnetic resonance imaging. Conservative non-weight-bearing treatment achieved a favorable outcome..
13. Toshifumi Fujiwara, Kenjiro Fujimura, Satoshi Hamai, Satoshi Kamura, Yasuharu Nakashima, Hisaaki Miyahara, Mid-term clinical outcome of constrained condylar knee prosthesis for patients with rheumatoid arthritis, Modern Rheumatology, 10.1080/14397595.2018.1486954, 2018.01.
14. Keisuke Komiyama, Jun-Ichi Fukushi, goro motomura, Satoshi Hamai, Satoshi Ikemura, Masanori Fujii, Yasuharu Nakashima, Does high hip centre affect dislocation after total hip arthroplasty for developmental dysplasia of the hip?, International Orthopaedics, 10.1007/s00264-018-4154-x, 2018.01.
15. Norio Goto, Ken Okazaki, Takenori Akiyama, Yukio Akasaki, Hideki Mizuuchi, Satoshi Hamai, Shunsuke Nakamura, Yasuharu Nakashima, Alignment factors affecting the medial meniscus extrusion increases the risk of osteoarthritis development, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-018-5286-7, 2018.01.
16. Yuan Ma, Hideki Mizuuchi, Tetsuro Ushio, Satoshi Hamai, Yukio Akasaki, Koji Murakami, Yasuharu Nakashima, Bony landmarks with tibial cutting surface are useful to avoid rotational mismatch in total knee arthroplasty, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-018-5052-x, 1-10, 2018.07.
17. Satoshi Hamai, Yusuke Kohno, Daisuke Hara, Kyohei Shiomoto, Mio Akiyama, Jun-Ichi Fukushi, goro motomura, Satoshi Ikemura, Masanori Fujii, Yasuharu Nakashima, Minimum 10-year clinical outcomes after periacetabular osteotomy for advanced osteoarthritis due to hip dysplasia, Orthopedics, 10.3928/01477447-20180806-04, 41, 5, 300-305, 2018.09, The purpose of this study was to examine the minimum 10-year clinical outcomes, including patient-reported and functional outcomes, of periacetabular osteotomy in patients with advanced osteoarthritis. A total of 46 hips in 44 patients with advanced osteoarthritis who underwent periacetabular osteotomy between 1992 and 2006 were retrospectively reviewed. Mean age at surgery was 47.5 years, and mean follow-up was 16.9±4.7 years. Survivorship was determined using the Kaplan-Meier method, and the associated risk factors for the endpoint-conversion to total hip arthroplasty less than 15 years after surgery-were evaluated. The Oxford Hip Score and the University of California, Los Angeles activity score were evaluated at final follow-up. The survival rates at 15 and 20 years after surgery were 80% and 59%, respectively. Multivariate analysis indicated that body mass index greater than 24 kg/m2 (P=.034; odds ratio, 1.72) was significantly associated with the endpoint as an independent risk factor. For 32 hips of 31 patients with preserved native joints at final follow-up, the Oxford Hip Score and the University of California, Los Angeles score averaged 41±5 and 5.2±1.8, respectively, equivalent (P=.28 and P=.215, respectively) to the scores of 14 hips of 13 patients with conversion to total hip arthroplasty (38±8.7 and 5.8±1.4, respectively). The results of this mid-term study may be useful for surgical decision-making among patients with advanced osteoarthritis who want to preserve native hip joints..
18. Yusuke Kubo, goro motomura, Satoshi Ikemura, Hiroyuki Hatanaka, Jun-Ichi Fukushi, Satoshi Hamai, Takuaki Yamamoto, Yasuharu Nakashima, Osteoclast-related markers in the hip joint fluid with subchondral insufficiency fracture of the femoral head, Journal of Orthopaedic Research, 10.1002/jor.24066, 36, 11, 2987-2995, 2018.11.
19. Keisuke Komiyama, Satoshi Hamai, Daisuke Hara, Satoru Ikebe, Hidehiko Higaki, Kensei Yoshimoto, Kyohei Shiomoto, Hirotaka Gondo, Yifeng Wang, Yasuharu Nakashima, Dynamic hip kinematics during squatting before and after total hip arthroplasty, Journal of Orthopaedic Surgery and Research, 10.1186/s13018-018-0873-3, 13, 1, 2018.07, [URL].
20. naoya kozono, Takamitsu Okada, Naohide Takeuchi, Satoshi Hamai, Hidehiko Higaki, Takeshi Shimoto, Satoru Ikebe, Hirotaka Gondo, Yoshitaka Nakanishi, Takahiro Senju, Yasuharu Nakashima, In vivo dynamic acromiohumeral distance in shoulders with rotator cuff tears, Clinical Biomechanics, 10.1016/j.clinbiomech.2018.07.017, 60, 95-99, 2018.12.
21. Jun-Ichi Fukushi, Ichiro Kawano, goro motomura, Satoshi Hamai, Kenichi Kawaguchi, Yasuharu Nakashima, Does hip center location affect the recovery of abductor moment after total hip arthroplasty?, Orthopaedics and Traumatology: Surgery and Research, 10.1016/j.otsr.2018.06.022, 104, 8, 1149-1153, 2018.12.
22. Yu Matsushita, Satoshi Hamai, Ken Okazaki, Koji Murakami, Yuan Ma, Masato Kiyohara, Hideki Mizuuchi, Yukio Akasaki, Yasuharu Nakashima, Recreational sports, workout and gym activities after total knee arthroplasty
Asian cohort study, Journal of Orthopaedics, 10.1016/j.jor.2018.12.002, 16, 1, 41-44, 2019.01.
23. Umito Kuwashima, Ken Okazaki, Kenyu Iwasaki, Yukio Akasaki, Hideya Kawamura, Hideki Mizuuchi, Satoshi Hamai, Yasuharu Nakashima, Patient reported outcomes after high tibial osteotomy show comparable results at different ages in the mid-term to long-term follow-up, Journal of Orthopaedic Science, 10.1016/j.jos.2018.12.022, 2019.01.
24. Daisuke Hara, Satoshi Hamai, Keisuke Komiyama, goro motomura, Kyohei Shiomoto, Yasuharu Nakashima, Sports Participation in Patients After Total Hip Arthroplasty vs Periacetabular Osteotomy
A Propensity Score-Matched Asian Cohort Study, Journal of Arthroplasty, 10.1016/j.arth.2017.08.035, 33, 2, 423-430, 2018.02.
25. Yusuke Kubo, goro motomura, Satoshi Ikemura, Hiroyuki Hatanaka, Takeshi Utsunomiya, Satoshi Hamai, Masanori Fujii, Jun-Ichi Fukushi, Yasuharu Nakashima, Effects of anterior boundary of the necrotic lesion on the progressive collapse after varus osteotomy for osteonecrosis of the femoral head, Journal of Orthopaedic Science, 10.1016/j.jos.2019.02.014, 2019.01.
26. Keisuke Komiyama, Satoshi Hamai, Daisuke Hara, Satoru Ikebe, Yifeng Wang, Hirotaka Gondo, Hidehiko Higaki, Yasuharu Nakashima, Dynamic hip kinematics during recreational classical ballet and hula dance after total hip arthroplasty
Two case reports, Journal of Medical Case Reports, 10.1186/s13256-018-1942-2, 13, 1, 2019.01, [URL].
27. Tetsuro Ushio, Ken Okazaki, Kanji Osaki, Yukihisa Takayama, Koji Sagiyama, Hideki Mizuuchi, Satoshi Hamai, Yukio Akasaki, Hiroshi Honda, Yasuharu Nakashima, Degenerative changes in cartilage likely occur in the medial compartment after anterior cruciate ligament reconstruction, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-019-05468-5, 2019.01.
28. Masaru Hada, Hideki Mizuuchi, Ken Okazaki, Takao Kaneko, Koji Murakami, Yuan Ma, Satoshi Hamai, Yasuharu Nakashima, Bi-cruciate stabilized total knee arthroplasty can reduce the risk of knee instability associated with posterior tibial slope, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-017-4718-0, 26, 6, 1709-1716, 2018.06.
29. Koji Murakami, Satoshi Hamai, Ken Okazaki, Hirotaka Gondo, Yifeng Wang, Satoru Ikebe, Hidehiko Higaki, Takeshi Shimoto, Hideki Mizuuchi, Yukio Akasaki, Yasuharu Nakashima, Knee kinematics in bi-cruciate stabilized total knee arthroplasty during squatting and stair-climbing activities, Journal of Orthopaedics, 10.1016/j.jor.2018.05.003, 15, 2, 650-654, 2018.06.
30. K. Murakami, Satoshi Hamai, T. Moro-oka, K. Okazaki, H. Higaki, T. Shimoto, S. Ikebe, Yasuharu Nakashima, Variable tibiofemoral articular contact stress in fixed-bearing total knee arthroplasties, Orthopaedics and Traumatology: Surgery and Research, 10.1016/j.otsr.2017.11.015, 104, 2, 177-183, 2018.04.
31. Koji Murakami, Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Hidehiko Higaki, Takeshi Shimoto, Yasuharu Nakashima, Preoperative tibial mechanical axis orientation and articular surface design influence on the coronal joint line orientation relative to the ground during gait after total knee arthroplasties, Knee Surgery, Sports Traumatology, Arthroscopy, 10.1007/s00167-018-4899-1, 1-9, 2018.03.
32. Koji Murakami, Satoshi Hamai, Ken Okazaki, Yifeng Wang, Satoru Ikebe, Hidehiko Higaki, Takeshi Shimoto, Hideki Mizuuchi, Yukio Akasaki, Yasuharu Nakashima, In vivo kinematics of gait in posterior-stabilized and bicruciate-stabilized total knee arthroplasties using image-matching techniques, International Orthopaedics, 10.1007/s00264-018-3921-z, 1-9, 2018.04.
33. Kensei Yoshimoto, Satoshi Hamai, Hidehiko Higaki, Hirotaka Gondo, Satoru Ikebe, Yasuharu Nakashima, Pre- and post-operative evaluation of pincer-type femoroacetabular impingement during squat using image-matching techniques
A case report, International Journal of Surgery Case Reports, 10.1016/j.ijscr.2017.12.007, 42, 121-127, 2018.01, [URL].
34. Kanji Osaki, Satoshi Hamai, Ken Okazaki, Yasutaka Tashiro, Yukihide Iwamoto, Preoperative 3-D MRI planning of tunnel placement in ACL reconstruction for a skeletally immature patient
A case report, Journal of Orthopaedic Science, 10.1016/j.jos.2017.05.011, 2018.01.
35. Kazuyuki Karasuyama, goro motomura, Satoshi Ikemura, Jun-Ichi Fukushi, Satoshi Hamai, Kazuhiko Sonoda, Yusuke Kubo, Takuaki Yamamoto, Yasuharu Nakashima, Risk factor analysis for postoperative complications requiring revision surgery after transtrochanteric rotational osteotomy for osteonecrosis of the femoral head, Journal of Orthopaedic Surgery and Research, 10.1186/s13018-018-0714-4, 13, 1, 2018.01.
36. Daisuke Abe, Satoshi Hamai, Ken Okazaki, Masato Yoshimoto, Takashi Komatsu, Yasuharu Nakashima, Inverted V-shaped high tibial osteotomy for severe tibia vara associated with Turner syndrome
A case report and review of literature, International Journal of Surgery Case Reports, 10.1016/j.ijscr.2017.12.008, 42, 128-132, 2018.01, [URL].
37. Yuan Ma, Hideki Mizuuchi, Ken Okazaki, Tetsuro Ushio, Koji Murakami, Satoshi Hamai, Yukio Akasaki, Yasuharu Nakashima, Effects of tibial baseplate shape on rotational alignment in total knee arthroplasty
three-dimensional surgical simulation using osteoarthritis knees, Archiv fur orthopadische und Unfall-Chirurgie, 10.1007/s00402-017-2828-2, 138, 1, 105-114, 2018.01.
38. Naoya Kozono, Takamitsu Okada, Naohide Takeuchi, Satoshi Hamai, Hidehiko Higaki, Takeshi Shimoto, Satoru Ikebe, Hirotaka Gondo, Yoshitaka Nakanishi, Takahiro Senju, Yasuharu Nakashima, Dynamic kinematics of the glenohumeral joint in shoulders with rotator cuff tears, Journal of Orthopaedic Surgery and Research, 10.1186/s13018-017-0709-6, 13, 1, 2018.01.
39. Tetsuro Ushio, Ken Okazaki, Hideki Mizuuchi, Satoshi Hamai, Yukio Akasaki, Yasuharu Nakashima, Anterior cruciate ligament reconstruction in a patient who has received systemic steroids for autoimmune disease, Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology, 10.1016/j.asmart.2017.11.003, 11, 12-14, 2018.01.
40. Umito Kuwashima, Hideki Mizuuchi, Ken Okazaki, Satoshi Hamai, Yukio Akasaki, Koji Murakami, Yasuharu Nakashima, Three-dimensional analysis of accuracy of patient-matched instrumentation in total knee arthroplasty
Evaluation of intraoperative techniques and postoperative alignment, Journal of Orthopaedic Science, 10.1016/j.jos.2017.08.010, 22, 6, 1077-1083, 2017.11.
41. Kensei Yoshimoto, Satoshi Hamai, Hidehiko Higaki, Hirotaka Gondoh, Yasuharu Nakashima, Visualization of a cam-type femoroacetabular impingement while squatting using image-matching techniques
a case report, Skeletal Radiology, 10.1007/s00256-017-2677-7, 46, 9, 1277-1282, 2017.09.
42. Hara D, Satoshi Hamai, Jun-ichi Fukushi, Ken-ichi Kawaguchi, Motomura Goro, Ikemura S, Komiyama K, Yasuharu Nakashima, Does participation in sports activities after periacetabular osteotomy degenerate the stage of osteoarthritis?, Am J Sports Med, 2017.06.
43. Utsunomiya T, Motomura Goro, Ikemura S, Satoshi Hamai, Jun-ichi Fukushi, Yasuharu Nakashima, The Results of Total Hip Arthroplasty After Sugioka Transtrochanteric Anterior Rotational Osteotomy for Osteonecrosis., J Arthroplasty, 2017.04.
44. Murakami K, Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Nakahara H, Hidehiko Higaki, Takeshi Shimoto, Hideki Mizu-uchi, Kuwashima U, Yukihide Iwamoto, Kinematic analysis of stair climbing in rotating platform cruciate-retaining and posterior-stabilized mobile-bearing total knee arthroplasties., Arch Orthop Trauma Surg, 137, 5, 701-711, 2017.05.
45. Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Murakami K, Hidehiko Higaki, Nakahara H, Takeshi Shimoto, Hideki Mizu-uchi, Yukio Akasaki, Yukihide Iwamoto, In vivo kinematics of healthy and osteoarthritic knees during stepping using density-based image-matching., J Appl Biomech, 32, 6, 586-592, 2016.01.
46. Yasuharu Nakashima, Masanori Fujii, Noguchi Y, Duenaga K, Takuaki Yamamoto, Jun-ichi Fukushi, Motomura Goro, Satoshi Hamai, Hara D, Yukihide Iwamoto, Arthroscopic validation of radiographic minimum joint space width associated with the subchondral bone exposure in symptomatic hip dysplasia., Mod Rheumatol, 27, 3, 524-528, 2016.03.
47. Kozono N, Takamitsu Okada, Naohide Takeuchi, Satoshi Hamai, Hidehiko Higaki, Satoru Ikebe, Takeshi Shimoto, Miake G, Nakanishi Y, Yukihide Iwamoto, In vivo kinematic analysis of glenohumeral joint during dynamic full axial rotation and scapular plane full abduction in healthy shoulders by 3D-to-2D model-to-image registration techniques., Knee Surg Sports Traumatol Arthrosc, 2016.08.
48. Yasuharu Nakashima, Takuaki Yamamoto, Jun-ichi Fukushi, Motomura Goro, Satoshi Hamai, Yusuke Kohno, Yukihide Iwamoto, Transtrochanteric rotational osteotomy for avascular necrosis of the femoral head after unstable slipped capital femoral epiphysis: 10-year clinical results., J Orthop Sci, 21, 6, 831-835, 2016.06.
49. Masanori Fujii, Yasuharu Nakashima, Noguchi Y, Takuaki Yamamoto, Motomura Goro, Satoshi Hamai, Yukihide Iwamoto, Factors associated with severity of intra-articular lesions in patients with severe hip dysplasia., Arthroscopy , 32, 8, 1581-1589, 2016.08.
50. Kuwashima U, Tashiro Y, Ken Okazaki, Hideki Mizu-uchi, Satoshi Hamai, Murakami K, Yukihide Iwamoto, Comparison of the impact of closing wedge versus opening wedge high tibial osteotomy on proximal tibial deformity and subsequent revision to total knee arthroplasty., Knee Surg Sports Traumatol Arthrosc, 25, 3, 869-875, 2016.03.
51. Hara D, Yasuharu Nakashima, Satoshi Hamai, Hidehiko Higaki, Satoru Ikebe, Takeshi Shimoto, Yoshimoto K, Yukihide Iwamoto, Three-Dimensional Hip Joint Kinematics during Golf swing after Total Hip Arthroplasty., Am J Sports Med, 44, 7, 1801-1809, 2016.07.
52. Kuwashima U, Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Hidehiko Higaki, Hideki Mizu-uchi, Yukio Akasaki, Murakami K, Yukihide Iwamoto, Contact stress analysis of the anterior tibial post in bi-cruciate stabilized and mobile-bearing posterior stabilized total knee arthroplasty designs., J Mech Behav Biomed Mater, 60, 460-467, 2016.01.
53. Satoshi Hamai, Yasuharu Nakashima, Mashima N, Takuaki Yamamoto, Kamada T, Motomura Goro, Imai H, Jun-ichi Fukushi, Miura H, Yukihide Iwamoto, Comparison of 10-year Follow-up Wear between Annealed and Remelted Highly Cross-Linked Polyethylenes: A Propensity-Matched Cohort Study., J Mech Behav Biomed Mater, 59, 99-107, 2016.01.
54. Murakami K, Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Takeshi Shimoto, Hara D, Hideki Mizu-uchi, Hidehiko Higaki, Yukihide Iwamoto, In vivo kinematics of healthy male knees during squat and golf swing using image-matching techniques., Knee, 23, 2, 221-226, 2016.02.
55. Hara D, Yasuharu Nakashima, Satoshi Hamai, Hidehiko Higaki, Satoru Ikebe, Takeshi Shimoto, Yoshimoto K, Yukihide Iwamoto, Dynamic Hip Kinematics in Patients with Osteoarthritis during Weight-Bearing Activities., Clin Biomech (Bristol, Avon), 32, 150-156, 2016.01.
56. Kanazawa M, Satoshi Hamai, Yasuharu Nakashima, Ohishi M, Motomura Goro, Takuaki Yamamoto, Jun-ichi Fukushi, Ushijim T, Hara D, Yukihide Iwamoto, Pelvic tilt and movement during total hip arthroplasty in the lateral decubitus position., Mod Rheumatol , 26, 3, 425-440, 2016.03.
57. Kanazawa M, Yasuharu Nakashima, Satoshi Hamai, Hirata M, Iwamoto Y, Is a Stem Version on the Crosstable Lateral Radiograph Accurate in Total Hip Arthroplasty?, J Arthroplasty, 36, 6, 1356-1360, 2016.06.
58. Yoshimoto K, Yasuharu Nakashima, Takuaki Yamamoto, Jun-ichi Fukushi, Motomura Goro, Ohishi M, Satoshi Hamai, Yukihide Iwamoto, Dislocation and its recurrence after revision total hip arthroplasty., Int Orthop, 40, 8, 1625-1630, 2016.08.
59. Ohishi M, Yasuharu Nakashima, Takuaki Yamamoto, Motomura Goro, Jun-ichi Fukushi, Satoshi Hamai, Yusuke Kohono, Yukihide Iwamoto, Cementless total hip arthroplasty for patients previously treated with femoral osteotomy for hip dysplasia: the incidence of periprosthetic fracture., Int Orthop, 40, 8, 1601-1606, 2016.08.
60. Matsubara H, Ken Okazaki, Osaki K, Tashiro Y, Hideki Mizu-uchi, Satoshi Hamai, Yukihide Iwamoto, Optimal entry position on the lateral femoral surface for outside-in drilling technique to restore the anatomical footprint of anterior cruciate ligament., Knee Surg Sports Traumatol Arthrosc, 24, 9, 2758-2766, 2016.06.
61. Okamoto S, Hideki Mizu-uchi, Ken Okazaki, Satoshi Hamai, Tashiro Y, Nakahara H, Iwamoto Y, Two-dimensional planning can result in internal rotation of the femoral component in total knee arthroplasty., Knee Surg Sports Traumatol Arthrosc, 24, 1, 229-235, 2016.01.
62. Ustunomiya T, Takuaki Yamamoto, Motomura Goro, Satoshi Hamai, Yukihide Iwamoto, The clinicopathologic findings of a subchondral insufficiency fracture of the femoral head in a male patient: a case report., Skeletal Radiol, 45, 10, 1425-1429, 2016.10.
63. Lee Y, Motomura Goro, Takuaki Yamamoto, Yasuharu Nakashima, Ohishi M, Satoshi Hamai, Iura K, Yukihide Iwamoto, Rapidly destructive arthrosis of the hip joint in a young adult with systemic lupus erythematosus., Rheumatol Int, 35, 10, 1753-1757, 2015.10.
64. Kuwashima U, Ken Okazaki, Tashiro Y, Hideki Mizu-uchi, Satoshi Hamai, Okamoto S, Murakami K, Yukihide Iwamoto, Correction of coronal alignment correlates with reconstruction of joint height in unicompartmental knee arthroplasty., Bone Joint Res, 4, 8, 128-133, 2015.08.
65. Okamoto S, Hideki Mizu-uchi, Ken Okazaki, Satoshi Hamai, Nakahara H, Iwamoto Y, Effect of tibial posterior slope on knee kinematics, quadriceps force, and patellofemoral contact force after posterior-stabilized total knee arthroplasty., J Arthroplasty, 30, 8, 1439-1443, 2015.08.
66. Nakahara H, Ken Okazaki, Satoshi Hamai, Okamoto S, Kuwashima U, Hidehiko Higaki, Yukihide Iwamoto, Does knee stability in the coronal plane in extension affect function and outcome after total knee arthroplasty?, Knee Surg Sports Traumatol, 23, 6, 1693-1698, 2015.06.
67. Satoshi Hamai, KEN OKAZAKI, Shimoto T, Nakahara H, Higaki H, Yukihide Iwamoto, Continuous sagittal radiologic evaluation of stair-climbing in cruciate-retaining and posterior-stabilized total knee arthroplasties., J Arthroplasty, 30, 5, 864-869, 2015.05.
68. Satoshi Hamai, Miyahara H, Esaki Y, Hirata G, Terada K, Kobara N, Miyazaki K, Senju T, Yukihide Iwamoto, Mid-term clinical results of primary total knee arthroplasty using metal block augmentation and stem extension in patients with rheumatoid arthritis., BMC Musculoskelet Disord, 16, 1, 225, 2015.01.
69. Nakahara H, Ken Okazaki, Satoshi Hamai, Kawahara S, Hidehiko Higaki, Hideki Mizu-uchi, Yukihide Iwamoto, Rotational alignment of the tibial component affects the kinematic rotation of a weight-bearing knee after total knee arthroplasty., Knee, 22, 3, 201-205, 2015.03.
70. Nakahara H, Ken Okazaki, Hideki Mizu-uchi, Satoshi Hamai, Yasutaka Tashiro, Shuichi Matsuda, Yukihide Iwamoto, Correlations between patient satisfaction and ability to perform daily activities after total knee arthroplasty: why aren't patients satisfied?, J Orthop Sci, 20, 1, 87-92, 2015.01.
71. Yamashita T, Wakata Y, Satoshi Hamai, Yasuharu Nakashima, Yukihide Iwamoto, Flanagan B, Nakashima N, Hirokawa S, Presumption model for postoperative hospital days from operation records., International Journal of Computer & Information Science, 16, 50-59, 2015.01.
72. Ken Okazaki, Yukihisa Takayama, Kanji Osaki, Yoshio Matsuo, Hideki Mizu-uchi, Satoshi Hamai, Hiroshi Honda, Yukihide Iwamoto, Subclinical cartilage degeneration in young athletes with posterior cruciate ligament injuries detected with T1ρ magnetic resonance imaging mapping., Knee Surg Sports Traumatol Arthrosc, 23, 10, 3094-3100, 2015.10.
73. Sonoda K, Yamamoto Takuaki, Motomura Goro, Satoshi Hamai, Karasuyama K, Kubo Y, Iwamoto Y, Bilateral corticosteroid-induced osteonecrosis of the femoral head detected at a 6-week interval., SpringerPlus, 4, 662, 2015.04.
74. Satoshi Hamai, Yasuharu Nakashima, Mio Akiyama, Umito Kuwashima, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Yukihide Iwamoto, Ischio-pubic stress fracture after periacetabular osteotomy in patients with hip dysplasia , Int Orthop, 2014.05.
75. Motomura Goro, Takuaki Yamamoto, K. Abe, Yasuharu Nakashima, Masanobu Ohishi, Satoshi Hamai, Toshio Doi, Hiroshi Honda, Yukihide Iwamoto, Scintigraphic assessments of the reparative process in osteonecrosis of the femoral head using SPECT/CT with 99mTc hydroxymethylene diphosphonate., Nucl Med Commun, 35, 10, 1047-1051, 2014.10.
76. Daisuke Hara, Yasuharu Nakashima, Satoshi Hamai, Hidehiko Higaki, Satoru Ikebe, Takeshi Shimoto, Makoto Hirata, Masayuki Kanazawa, Yusuke Kohno, Yukihide Iwamoto, Kinematic analysis of healthy hips during weight-bearing activities by 3D-to-2D model-to-image registration technique., Biomed Res Int, 457573, 2014.11.
77. Yusuke Kohno, Yasuharu Nakashima, Toshio Kitano, Tomoyuki Nakamura, Kazuyuki Takamura, Miho Akiyama, Daisuke Hara, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Yukihide Iwamoto, Subclinical bilateral involvement of the hip in patients with slipped capital femoral epiphysis-a multicentre study., Int Orthop, 37, 8, 477-482, 2014.03.
78. KEN OKAZAKI, Yasutaka Tashiro, Hideki Mizu-uchi, Satoshi Hamai, Yukihide Iwamoto, Influence of the posterior tibial slope on the flexion gap in total knee arthroplasty, Knee, 21, 4, 806-809, 2014.08.
79. KEN OKAZAKI, Hirokazu Matsubara, Kanji Osaki, Yasutaka Tashiro, Hideki Mizu-uchi, Satoshi Hamai, Toshio Doi, Yukihide Iwamoto, Femoral tunnel apertures on the lateral cortex in anterior cruciate ligament reconstruction: an analysis of cortical button fixation., Arthroscopy, 30, 7, 841-848, 2014.07.
80. Satoshi Hamai, KEN OKAZAKI, Hideki Mizu-uchi, Yasutaka Tashiro, Takeshi Shimoto, Hidehiko Higaki, Yukihide Iwamoto, Kinematic analysis of kneeling and stair-climbing in a posterior-stabilized total knee arthroplasty, Int J Comput Assist Radiol Surg, 9, Supple 1, S332, 2014.06.
81. Hiroyuki Nakahara, KEN OKAZAKI, Satoshi Hamai, Shigetoshi Okamoto, Umito Kuwashima, Hidehiko Higaki, Yukihide Iwamoto, Does knee stability in the coronal plane in extension affect function and outcome after total knee arthroplasty?, Knee Surg Sports Traumatol Arthrosc, 2014.06.
82. Shigetoshi Okamoto, KEN OKAZAKI, Hiroaki Mitsuyasu, Shuichi Matsuda, Hideki Mizu-uchi, Satoshi Hamai, Yasutaka Tashiro, Yukihide Iwamoto, Extension gap needs more than 1-mm laxity after implantation to avoid post-operative flexion contracture in total knee arthroplasty, Knee Surg Sports Traumatol Arthrosc, 2014.01.
83. Iida K, Satoshi Hamai, Takuaki Yamamoto, Yasuharu Nakashima, Motomura Goro, Ohishi M, Karasuyama K, Iwamoto Y, Subchondral fracture of the femoral head after acetabular fracture: a case report, J Med Case Rep, 81, 1, 447, 2014.01, [URL].
84. Yusuke Khono, Yasuharu Nakashima, T Kitano, T Nakamura, K Takamura, Mio Akiyama, Daisuke Hara, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Yukihide Iwamoto, Subclinical bilateral involvement of the hip in patients with slipped capital femoral epiphysis-a multicentre study., Int Orthop, 2013.12.
85. Yasuharu Nakashima, Masanobu Hirata, Mio Akiyama, Takahumi Itokawa, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Yukihide Iwamoto, Combined anteversion technique reduced the dislocation in cementless total hip arthroplasty., Int Orthop, 2013.09.
86. Mio Akiyama, Yasuharu Nakashima, T Kitano, K Takamura, Yusuke Kohno, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Remodelling of femoral head-neck junction in slipped capital femoral epiphysis: a multicentre study., Int Ortho, 2013.08.
87. Yasuharu Nakashima, Taishi Sato, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Mio Akiyama, Masanobu Hirata, Daisuke Hara, Yukihide Iwamoto, Results at a minimum of 10 years of follow-up for AMS and PerFix HA-coated cementless total hip arthroplasty: impact of cross-linked polyethylene on implant longevity., J Orthop Sci, 2013.07.
88. Satoshi Hamai, Nicholas J. Dunbar, Taka-aki Moro-oka, Hiromasa Miura, Yukihide Iwamoto, Scott A. Banks, Physiologic sagittal plane patellar kinematics during dynamic deep knee flexion, Int Orthop, Epub ahead of print, 2013.06.
89. Takahumi Itokawa, Yasuharu Nakashima, Takuaki Yamamoto, Motomura Goro, Masanobu Ohishi, Satoshi Hamai, Miho Akiyama, Masanobu Hirata, Daisuke Hara, Yukihide Iwamoto, Late dislocation is associated with recurrence after total hip arthroplasty, Int Orthop, Epub ahead of print, 2013.05.
90. Satoshi Hamai, Hiromasa Miura, KEN OKAZAKI, Takeshi Shimoto, Hidehiko Higaki, Yukihide Iwamoto, No influence of coronal laxity and alignment on lift-off after well-balanced and aligned total knee arthroplasty , Knee Surg Sports Traumatol Arthrosc, Epub ahead of print, 2013.04.
91. Masanobu Hirata, Yasuharu Nakashima, Masanobu Ohishi, Satoshi Hamai, Daisuke Hara, Yukihide Iwamoto, Surgeon Error in Performing Intraoperative Estimation of Stem Anteversion in Cementless Total Hip Arthroplasty, J Arthroplasty, Epub ahead of print, 2013.04.
92. Satoshi Hamai, Taka-aki Moro-oka, Nicholas J. Dunbar, Hiromasa Miura, Yukihide Iwamoto, Scott A. Banks, In vivo healthy knee kinematics during dynamic full flexion, Biomed Res Int, 10.1155/2013/717546, 2013.01, [URL].
93. Kuroyanagi Y, Mu S, Hamai S, Robb WJ, Banks SA, In vivo knee kinematics during stair and deep flexion activities in patients with bicruciate substituting total knee arthroplasty., J Arthroplasty, 2012.01.
94. Shang Mu, Taka-aki Moro-oka, P. Johal, Satoshi Hamai, M. A. R. Freeman, Scott A. Banks, Comparison of static and dynamic knee kinematics during squatting, Clin Biomech (Bristol, Avon), 26, 1, 106-108, 2011.01.
95. Hamai S, Miura H, Matsuda S, Shimoto T, Higaki H, Iwamoto Y, Contact stress at the anterior aspect of the tibial post in posterior-stabilized total knee replacement., J Bone Joint Surg Am, 92, 8, 1765-1773, 2010.08.
96. Satoshi Hamai, Taka-aki Moro-oka, Hiromasa Miura, Takeshi Shimoto, Hidehiko Higaki, B. J. Fregly, Yukihide Iwamoto, Scott A. Banks, Knee kinematics in medial osteoarthritis during in vivo weight-bearing activities., J Orthop Res, 27, 12, 1555-1561, 2009.12.
97. Satoshi Hamai, Three-dimensional knee joint kinematics during golf swing and stationary cycling after total knee arthroplasty., J Orthop Res, 26, 12, 1556-1561, 2008.12.
98. Mawatari T, Miura H, Hamai S, Shuto T, Nakashima Y, Okazaki K, Kinukawa N, Sakai S, Hoffmann P, Iwamoto Y, Keaveny T, Vertebral strength changes in rheumatoid arthritis patients treated with alendronate, as assessed by finite element analysis of clinical computed tomography scans: A prospective randomized clinical trial., Arthritis Rheum, 58, 11, 3340-3349, 2008.11.
99. Hamai S, Miura H, Higaki H, Shimoto T, Nakanishi Y, Iwamoto Y, Kinematic analysis of mobile-bearing total knee arthroplasty using a 6-DOF knee simulator., J Orthop Sci, 13, 6, 543-549, 2008.06.
100. Moro-oka TA, Hamai S, Miura H, Shimoto T, Higaki H, Fregly BJ, Iwamoto Y, Banks SA, Dynamic activity dependence of in vivo normal knee kinematics., J Orthop Res, 26, 4, 428-434, 2008.04.
101. Hamai S, Miura H, Higaki H, Matsuda S, Shimoto T, Sasaki K, Yoshizumi M, Okazaki K, Tsukamoto N, Iwamoto Y, Kinematic analysis of kneeling in cruciate-retaining and posterior-stabilized total knee arthroplasties., J Orthop Res, 26, 4, 435-442, 2008.04.
102. Moro-oka TA, Hamai S, Miura H, Shimoto T, Higaki H, Fregly BJ, Iwamoto Y, Banks SA, Can magnetic resonance imaging-derived bone models be used for accurate motion measurement with single-plane three-dimensional shape registration?, J Orthop Res, 25, 7, 867-872, 2007.07.
103. Mawatari, T.; Miura, H.; Hamai, S., et al., Evaluation of 3-D microarchitecture of human osteoporotic spine in vivo by using high-resolution computed tomography. , Calcified Tissue International , 72, 4, 406, 2003.04.
104. Hamai, S.; Mawatari, T.; Miura, H., et al., Evaluation of inhomogeneity of human vertebral cancellous bone by using high-resolution computed tomography in vivo. , Calcified Tissue International, 72, 4, 407, 2003.04.
105. Mawatari, T; Miura, H; Hamai, S, et al., Effect of alendronate on human osteoporotic spine induced by glucocorticoid-3D microarchitectural analyses in vivo. , J Bone Miner Res, 19, S373-S373, Supplement: 1 , 2004.10.
106. Hamai, S; Mawatari, T; Miura, H, et al., Localization of the cancellous bone inside the human lumber vertebra , J Bone Miner Res, 19, S432-S432, Supplement: 1, 2004.10.
107. Higaki H, Shimoto T, Yoshizumi M, Nakanishi Y, Kurata K, Hamai S, Miura H, Iwamoto Y, Motion analysis of kneeling in cruciate-retaining and posterior-substituting total knee arthroplasty, 5th World Congress of Biomechanics, 157-162, 2006.04.
108. Hamai S, Harimaya K, Maeda T, Hosokawa A, Shida J, Iwamoto Y, Traumatic Atlanto-occipital Dislocation with Atlantoaxial Subluxation., SPINE, 31, 13, E421-E424, 2006.04.
109. Mawatari, T; Miura, H; Hamai, S, et al., In vivo longitudinal evaluation of vertebral bone strength in patients with rheumatoid arthritis treated with alendronate by using finite element analysis of QCT scans., J Bone Miner Res, 21, S288-S289, Supplement: 1, 2006.09.