Kyushu University Academic Staff Educational and Research Activities Database
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Kenji Kitamura Last modified date:2022.06.09

Graduate School

Country of degree conferring institution (Overseas)
Field of Specialization
Total Priod of education and research career in the foreign country
Research Interests
  • hip
    keyword : hip dysplasia, periacetabular osteotomy, finite-element analysis
Academic Activities
1. Kitamura Kenji, Masanori Fujii, Satoshi Ikemura, Satoshi Hamai, Goro Motomura, Yasuharu Nakashima, Does Patient-specific Functional Pelvic Tilt Affect Joint Contact Pressure in Hip Dysplasia? A Finite-element Analysis Study., Clinical orthopaedics and related research, 10.1097/CORR.0000000000001737, 479, 8, 1712-1724, 2021.08, Background Although individual and postural variations in the physiologic pelvic tilt affect the acetabular orientation and coverage in patients with hip dysplasia, their effect on the mechanical environment in the hip has not been fully understood. Individual-specific, finite-element analyses that account for physiologic pelvic tilt may provide valuable insight into the contact mechanics of dysplastic hips, which can lead to further understanding of the pathogenesis and improved treatment of this patient population. Question/purpose We used finite-element analysis to ask whether there are differences between patients with hip dysplasia and patients without dysplasia in terms of (1) physiologic pelvic tilt, (2) the pelvic position and joint contact pressure, and (3) the morphologic factors associated with joint contact pressure. Methods Between 2016 and 2019, 82 patients underwent pelvic osteotomy to treat hip dysplasia. Seventy patients with hip dysplasia (lateral center-edge angle $ 0° and < 20° on supine AP pelvic radiographs) were included. Patients with advanced osteoarthritis, femoral head deformity, prior hip or supine surgery, or poor-quality imaging were excluded. Thirty- two patients (32 hips) were eligible to this finite-element analysis study. For control groups, we reviewed 33 female volunteers without a history of hip disease. Individuals with frank or borderline hip dysplasia (lateral center-edge angle < 25°) or poor-quality imaging were excluded. Sixteen individuals (16 hips) were eligible as controls. Two board-certified orthopaedic surgeons measured sagittal pelvic tilt (the angle between the anterior pelvic plane and vertical axis: anterior pelvic plane [APP] angle) and acetabular version and coverage using pelvic radiographs and CT images. Intra- and interobserver reliabilities, evaluated using the kappa value and intraclass correlation coefficient, were good or excellent. We developed individual-specific, finite-element models using pelvic CT images, and performed nonlinear contact analysis to calculate the joint contact pressure on the acetabular cartilage during the single-leg stance with respect to three pelvic positions: standardized (anterior pelvic plane), supine, and standing. We compared physiologic pelvic tilt between patients with and without dysplasia using a t-test or the Wilcoxon rank sum test. A paired t-test or the Wilcoxon signed rank test with a Bonferroni correction was used to compare joint contact pressure between the three pelvic positions. We correlated joint contact pressure with morphologic parameters and pelvic tilt using the Pearson or the Spearman correlation coefficients.
2. Kitamura Kenji, Masanori Fujii, Miho Iwamoto, Satoshi Ikemura, Satoshi Hamai, Goro Motomura, Yasuharu Nakashima, Is Anterior Rotation of the Acetabulum Necessary to Normalize Joint Contact Pressure in Periacetabular Osteotomy? A Finite-element Analysis Study., Clinical orthopaedics and related research, 10.1097/CORR.0000000000001893, 480, 1, 67-78, 2021.07.
3. Kitamura Kenji, Masanori Fujii, Satoshi Ikemura, Satoshi Hamai, Goro Motomura, Yasuharu Nakashima, Factors Associated with Abnormal Joint Contact Pressure after Periacetabular Osteotomy: A Finite-Element Analysis1., The Journal of arthroplasty, 10.1016/j.arth.2022.04.045, 2022.05.