[Purpose] Knee osteoarthritis can alter gait variability; however, few studies have investigated the associating factors with gait cycle time variability. The first objective was to compare gait cycle variability between female patients with knee osteoarthritis and healthy elderly females and to determine gait characteristics in patients with knee osteoarthritis. The second objective was to identify the associating factors with gait cycle time variability. [Participants and Methods] The participants included 24 female patients diagnosed with knee osteoarthritis and 12 healthy elderly females. Gait cycle variability (coefficient of variation of gait cycle time), knee extension range of motion, knee extension strength, 5-m walk test, Timed Up & Go Test, and Western Ontario and McMaster Universities Osteoarthritis Index were measured. All assessment results were compared between the knee osteoarthritis and healthy groups. [Results] Gait cycle time variability was significantly higher in the knee osteoarthritis group than in the healthy group. Further, it showed a significant positive correlation with the 5-m walk test and the Western Ontario and McMaster Universities Osteoarthritis Index. [Conclusion] Patients with knee osteoarthritis presented greater gait cycle variability than that of healthy individuals. Therefore, rehabilitation to improve gait variability might enhance the quality of life of patients with knee osteoarthritis.
The purpose of this study was to investigate whether joint function and physical ability differ according to the presence of pain during knee joint extension in knee osteoarthritis (knee OA). [Participants and Methods] Thirty-one female patients with knee OA were included. The presence of pain during knee extension was assessed under three conditions: (1) active knee extension, (2) stepping, and (3) one-legged squatting. In addition, knee extension range of motion (ROM), knee extension strength, 5-meter walking distance (5MWT), Timed Up & Go Test (TUG) and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) were evaluated. [Results] The WOMAC score was significantly higher, knee extension strength and ROM were significantly lower, and 5MWT (maximum speed) and TUG were significantly slower in the group with pain during active knee extension. Moreover, the group with pain during stepping had a significantly slower 5MWT (comfortable speed). [Conclusion] In patients with knee OA, pain during knee extension was associated with poorer knee joint function and lower gait speed.
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