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Stand-to-Sit Kinematics of the Pelvis Is Not Always as Expected: Hip and Spine Pathologies Can Have an Impact

Type
Articles dans des revues avec comité de lecture
Author
KIM, Youngwoo
521081 Graduate School of Medicine and Faculty of Medicine Kyoto University
541961 Service de chirurgie orthopédique et traumatologique [CHU Pitié-Salpêtrière]
466360 Institut de Biomecanique Humaine Georges Charpak
VERGARI, Claudio
466360 Institut de Biomecanique Humaine Georges Charpak
GIRINON, François
466360 Institut de Biomecanique Humaine Georges Charpak
LAZENNEC, Jean-Yves
353778 CHU Pitié-Salpêtrière [AP-HP]
SKALLI, Wafa
466360 Institut de Biomecanique Humaine Georges Charpak

URI
http://hdl.handle.net/10985/15601
DOI
10.1016/j.arth.2019.04.059
Date
2019
Journal
The Journal of Arthroplasty

Abstract

Introduction; Stand to sit pelvis kinematics is commonly considered as a rotation around the bicoxofemoral axis. However, abnormal kinematics could occur for patients with musculoskeletal disorders affecting the hip-spine complex. The aim of this study is to perform a quantitative analysis of the stand to sit pelvis kinematics using 3D reconstruction from bi-planar x-rays. Material & Methods; Thirty volunteers as a control group (C), 30 patients with hip pathology (Hip) and 30 patients with spine pathology (Spine) were evaluated. All subjects underwent standing and sitting full-body bi-planar x-rays. 3D reconstruction was performed in each configuration and then translated such as the middle of the line joining the center of each acetabulum corresponds to the origin. Rigid registration quantified the finite helical axis (FHA) describing the transition between standing and sitting with two specific parameters. The orientation angle (OA) is the signed 3D angle between FHA and bicoxofemoral axis and the rotation angle (RA) represents the signed angle around FHA. Results; Mean OA was -1.8° for C group, 0.3° for Hip group and -2.4° for Spine group. There was no significant difference in mean OA between groups. However, variability was higher for Spine group with a standard deviation of 16.4° compared to 10.8° in C group and 12.3° in Hip group. Mean RA in C group was 18.1° (SD 9.1°). There was significant difference in RA between Hip and Spine groups (21.1° SD 8.0°) and 16.4° (SD 10.8°), respectively) (p=0.04). Conclusion; Hip and spine pathologies affect stand to sit pelvic kinematics.

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