cam impingement
Hip impingement caused by abnormal bony prominence on the femoral head-neck junction creating mechanical conflict.
Full Definition
Cam impingement is a type of femoroacetabular impingement (FAI) characterized by an abnormal bony prominence or bump on the femoral head-neck junction. This morphological abnormality creates a cam-like mechanism where the aspherical portion of the femoral head abuts against the acetabular rim during hip flexion and internal rotation, particularly common in athletic activities. The repetitive contact can lead to labral tears, cartilage damage, and eventual osteoarthritis. Cam impingement is frequently seen in young athletes, particularly those involved in sports requiring repetitive hip flexion such as hockey, soccer, and martial arts. The condition is typically diagnosed through specialized radiographic views and MRI, with treatment ranging from activity modification to arthroscopic or open surgical correction.
Usage
Usage note: Part of FAI classification; distinguish from pincer-type impingement which affects acetabular side.
In Context
- "Alpha angle measurement on MRI confirmed the presence of cam impingement morphology." — Radiological assessment
- "Arthroscopic femoroplasty was performed to address the cam impingement and restore normal hip mechanics." — Operative procedure note