This study analysed the lower extremity muscle activity depending on the use of the Power Leg, a wearable knee aid, in elderly people with osteoarthritis. Eight participants who had osteoarthritis were asked to repeat sit-to-stand from a chair first without the knee aid, following which they were asked to repeat the same movement with the knee aid. Surface electromyography (EMG) was used to analyse muscle activities of the vastus medialis, rectus femoris, and vastus lateralis on the quadriceps femoris of the right leg while performing sit-to-stand motion. The result showed an 11.25% decrease in muscle activity of the vastus medialis, from 50.43% without the knee aid to 39.18% with the knee aid, which was significant (p < .05). Muscle activity of the rectus femoris decreased by 5.17%, from 29.49% without the knee aid down to 24.32% with the knee aid. However, the difference was not significant. The vastus lateralis had reduced muscle activity by 16.22%, from 57.15% without the knee aid to 40.93% with the knee aid, which was significant (p < .05). The results of this study showed that the Power Leg knee aid may decrease muscle activity by assisting lower extremity muscles during the sit-to-stand motion and effectively support the knee extensor during knee extension. Given these findings, as well as the ease of wearing and using the Power Leg knee aid, it is concluded that the wearable knee aid is very useful for the elderly with knee osteoarthritis.

中文翻译：

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老年骨关节炎患者使用膝关节辅助器对下肢肌肉活动的影响分析

这项研究分析了患有骨关节炎的老年人在使用 Power Leg（一种可穿戴的膝关节辅助装置）的情况下的下肢肌肉活动。八名患有骨关节炎的参与者首先被要求在没有护膝的情况下从椅子上重复从坐到站，然后他们被要求在使用护膝的情况下重复相同的动作。表面肌电图 (EMG) 用于分析右腿股四头肌上股内侧肌、股直肌和股外侧肌的肌肉活动，同时进行坐立运动。结果显示股内侧肌的肌肉活动减少了 11.25%，从没有使用护膝的 50.43% 下降到使用护膝的 39.18%，这是显着的 (p < .05)。股直肌的肌肉活动下降了 5.17%，从没有护膝的 29.49% 下降到 24%。32% 使用膝关节辅助装置。然而，差异并不显着。股外侧肌的肌肉活动减少了 16.22%，从没有使用护膝的 57.15% 减少到使用护膝的 40.93%，这是显着的 (p < .05)。这项研究的结果表明，Power Leg 护膝可以通过在坐到站运动过程中辅助下肢肌肉来减少肌肉活动，并在伸膝过程中有效地支撑膝伸肌。鉴于这些发现，以及 Power Leg 护膝的佩戴和使用方便，可以得出结论，可穿戴护膝对患有膝关节骨关节炎的老年人非常有用。这项研究的结果表明，Power Leg 护膝可以通过在坐到站运动过程中辅助下肢肌肉来减少肌肉活动，并在伸膝过程中有效地支撑膝伸肌。鉴于这些发现，以及 Power Leg 护膝的佩戴和使用方便，可以得出结论，可穿戴护膝对患有膝关节骨关节炎的老年人非常有用。这项研究的结果表明，Power Leg 护膝可以通过在坐到站运动过程中辅助下肢肌肉来减少肌肉活动，并在伸膝过程中有效地支撑膝伸肌。鉴于这些发现，以及 Power Leg 护膝的佩戴和使用方便，可以得出结论，可穿戴护膝对患有膝关节骨关节炎的老年人非常有用。