英语语法分析

Patellar tracking is affected by a combination of static and dynamic factors.

髌骨的运行轨迹受到静态的和动态的多重因素的影响。

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

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。

Patellar joint disorder, with knee anterior pain as the main symptom, is a common knee joint disease occurring in clinic and exercise.

髌股关节紊乱，以膝前痛为主要症状，是临床和体育运动中常见的膝关节疾患。