Femoroacetabular Impingement

Femoroacetabular impingement (FAI) is a musculoskeletal disorder of the hip, referring to the repetitive contact of the femoral neck and the lateral rim of the acetabulum, and the subsequent trauma and injury that result. The symptoms may be mild, but FAI can progress, lead to other mechanical dysfunctions, and potentially create osteoarthritis significant enough to require hip replacement surgery.


Hip impingement occurs because of two primary mechanisms: (1) cam impingement and (2) pincer impingement. This can be visualized easier as a problem with the ...

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