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Quantitative gait analysis in unconstrained total knee arthroplasty patients

Clinical results as well as survivorship of knee joint endoprostheses have improved enormously during the last two decades. Key terms such as ‘minimal bone resection’, ‘reduced interface stress’ and ‘unconstrained bicondylar knees’ have been trendsetting for the change from hinged to bicondylar knee prostheses. Due to a tendency of reduced incidence of aseptic loosenings and infections, patellar complications represent the most frequent reason for revision operations (Ayers et al., 1997; SchroederBoersch, 1998). Quality of life has been markedly improved (Rissanen et al., 1995), although there are still some unsolved problems left. These complaints of unknown origin are often connected with the patella and are simply described as ‘anterior knee pain’ (Boyd et al. (1993). Evaluation of functional parameters that cannot be registered by clinical or radiological examinations has gained importance. These functional investigations comprise proprioceptive tests, isokinetic strength assessment as well as analysis of gait pattern. In this study, gait analysis as well as clinical and qualityof-life assessment were carried out on total knee arthroplasty patients, in order to identify possible causes of residual complaints after total knee arthroplasty. In contrast to previous studies, which were mainly aimed at improving gait velocity preand postoperatively, this study is the first to compare gait pattern at constant velocity with a healthy control group of the same age.