New Parameter for Modelling of Hip Motion at Patient with Coxarthritis

R.M. Kiss (Hungary)

Keywords

Biomechanics, gait analysis, kinematical gait parameters, osteoarthritis, hip

Abstract

It is difficult to identify objective parameters for assessing the joint function when evaluating the outcome of orthopaedic procedures, especially endoprosthetic replacement. Spatial-temporal and angular parameters of gait have clinical relevance in the assessment of motor pathologies, particularly in orthopaedics. These parameters did not model the motion of the femur with respect to the pelvis. The first aim of this study is to determine a new parameter (relative hip movement parameter) for modelling the motion of the bones forming the hip joint. The spatial-temporal, angular parameters and relative movement parameters are determined by a zebris ultrasound-based motion analyser at 20 healthy subjects and at 20 patients with unilateral hip disease (Kellgren-Lawrance radiographic index 4). The second aim of this study is to compare the gait parameters of patients to those of healthy subjects. Asymmetry was observed in spatial-temporal parameters, the range of hip motion, maximum hip flexion, maximum hip extension, as well as knee motion in patients. Therefore, it was suggested that the increased motion of the opposite hip and knee was a compensatory function. The study showed that increased pelvis obliquity and flexion-extension occurred as compensation. It seems that the range of pelvis rotation was not involved, even in our patients with unilateral osteoarthritis of the hip joint. The relative hip movement parameter of patients is significantly less compared to the parameter of healthy subjects, it means the motion of the femur with respect to the pelvis is small.

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