Motion analysis after total knee arthroplasty
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The aim of this study is to evaluate the functional performance after total knee replacement (TKR). Two groups of patients, one with mobile (n=9) and one with fixed bearing (n=8) total knee prosthesis, were compared by means of motion analysis. A group of healthy subjects (n=8), matched by age, were used as controls. Kinematics, kinetics and electromyography data were collected during physiological daily activities such as walking and squatting. During walking, both groups of patients showed a speed of progression, a maximum knee extension moment (stance phase) and a maximum knee flexion (swing phase) significantly lower than the control group. Moreover, during the swing phase a co-contraction of the antagonistic muscles of the inferior limb was present. During squatting, both groups of patients showed a peak of knee flexion significantly lower than the control group. Motion pattern after TKR is unphysiological but the abnormalities seem to be independent from the differences in the implant designs.
Key wordsMobile bearing prosthesis Fixed bearing prosthesis Gait analysis Squat Total knee arthroplasty
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