背景知识概要：髌股关节疼痛综合症是最常见的膝关节病变之一，可能和异常的髌骨轨迹有关。

Background: Patellofemoral pain syndrome is one of the most common knee problems and may be related to abnormal patellar tracking.

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背景知识概要：髌股关节疼痛综合症是最常见的膝关节病变之一，可能和异常的髌骨轨迹有关。

Background: Patellofemoral pain syndrome is one of the most common knee problems and may be related to abnormal patellar tracking.

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