[Purpose] In this study, we investigated whether prosthesis improves proprioception or not in patients with knee osteoarthritis (OA). We inspected knee proprioception among people with knee OA and age matched controls, and also examined knee proprioception in knee OA patients with or without prosthesis.[Subjects] Twenty knee OA patients and 20 controls participated in this study. [Methods] We measured knee proprioception with modified continuous passive motion.[Results] Knee OA patients had worse proprioception than controls. Prosthesis improved knee proprioception in knee OA patients. [Conclusion] From the point of view of proprioception, prosthesis was beneficial for knee OA patients.
Using three-dimensional analysis, we measured the knee joint angle in walking for gonarthrosis patients and healthy elderly people and performed chaos analysis on the knee joint angle data of 3 gait cycles. In the comparison of the patients and healthy people using the Lyapunov index, which is a chaos index, the Knee OA group showed a significantly lower value compared with healthy elderly people (healthy elderly people: 1.90 ± 0.59, knee OA group: 1.61 ± 0.40, p<0.05). In correlation analysis of the Lyanupuv index of knee OA and clinical data (time from onset; the Japanese Orthopaedic Association knee joint function evaluation, JOA score; femorotibial joint, FTA; knee joint ROM, gait speed), a significant correlation was only obtained for the JOA score (r=0.73, p<0.05). These results show that the more serious the osteoarthritis was, the smaller the Lyapunov index became, suggesting this chaos index is related to the knee joint function.
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