A. Illyés, Z. Bejek, R. Paróczai, I. Szlávik, and R.M. Kiss (Hungary)
Biomechanics, Gait analysis, osteoarthritis, hip, total hip arthroplasty (THA)
In 20 patients with unilateral hip disease, who underwent total hip arthroplasty (THA), the gait was analyzed preoperatively and 12 months after unilateral THA using a zebris ultrasound-based three-dimensional motion analysis system. The constant gait speed was 2.5 km/h. The spatial-temporal and angular parameters are compared to the gait parameters of 20 elderly, healthy subjects. The aim of this study is to determine how selected gait parameters may change as a result of total hip arthoplasty at constant gait speed. Before THA asymmetry was observed in spatial-temporal parameters, in range of hip motion, maximum hip flexion, maximum hip extension, as well as in knee motion. Therefore, it was suggested that the increased motion of the opposite hip and knee was a compensatory function. The study showed that increased pelvic obliquity and flexion-extension as compensation. It seems that the range of pelvic rotation was not involved, even in our patients with unilateral osteoarthritis of the hip joint. At 12 months after THA, asymmetry of spatial-temporal parameters and of knee and hip joint motion could not be observed, the increased pelvic motion also became less significant. Therefore, this study suggested that THA could reverse the adverse influence on other joints prior to symmetrical normalization of hip motion.
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