The goal of this observational study is to describe the radiographic and kinematic features in patients with femoroacetabular impingement syndrome (FAI). The main questions it aims to answer are: * Is structural knee abnormalities associated with knee pain symptoms in FAI patients? * Does FAI patients with knee pain demonstrate unique kinematic characteristics？ Participants will receive routine preoperative radiographic examinations, which include ipsilateral knee MRI for the purpose of femoral version measurement. Participants will also receive markerless motion capture analysis. Researchers will compare preoperative radiographic and kinematic features based on knee pain status, which is routinely collected as part of clinical investigation procedures.
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Preoperative radiographic cartilage defect of ipsilateral knee
Timeframe: Knee MRI radiographs are evaluated at baseline.
Preoperative radiographic meniscal tear of ipsilateral knee
Timeframe: Knee MRI radiographs are evaluated at baseline.
Preoperative radiographic ligament ruptures of ipsilateral knee
Timeframe: Knee MRI radiographs are evaluated at baseline.
Foot progression angle during normal gait
Timeframe: Motion capture data are assessed at baseline.