Comparison of different kinematic methods for determining the hip joint center

Shuo-Suei Hung ； Ping-Lang Yen

《Formosan Journal of Musculoskeletal Disorders》 9卷4期 (2018/11) Pp. 131-136

https://doi.org/10.6492/FJMD.201811_9(4).0001

摘要

Introduction: Identification of the hip joint center (HJC) is crucial in determining the alignment and motion of the lower limb, which is important during biomechanical researches, or other clinical applications such as navigation surgeries. Purpose: The purpose of this study is to compare the accuracy of different kinematic methods for obtaining the center of hip joint, in order to find the optimal motion tract recommended during the kinematic assessment. Methods: In this cadaver study, the center of hip joint was calculated from kinematic data acquired by performing three different passive motions (flexion-extension [FE], adduction-abduction [AA], and circumduction [CIR]), and the data was compared to the actual position of femoral head determined via anterior arthrotomy of hip joint. The geometric sphere fitting method was used, and the motion arc zone was segmented into different intervals for analysis. Results: The results showed that with CIR motion of femur, the calculated HJC had the highest accuracy in relationship to the actual femoral head center, and abduction-adduction motion had the poorest accuracy. Regarding the best motion arc zone, a better accuracy was found when the motion range was from 10° to 40°. Conclusion: Different kinematic methods may have different results. In conclusion, when evaluating the HJC via kinematic method, CIR motion at a motion arc zone of 30° is recommended.

關鍵字

geometric sphere fitting ； hip joint center ； motion analysis