flex knee joint
屈曲膝关节
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Patella instability is a kind of common patellofemora disease, it refers to the degree of patella extraversion or moving outward increases when the knee-joint extend and flex.
髌骨不稳是一种常见的髌股关节疾患，指膝关节伸曲活动时髌骨发生外倾或外移程度加大。
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