A bursa at the proximal rectus femoris reflected head, between the tendon and the anterior hip capsule at the acetabular rim. It reduces friction as the reflected tendon of rectus femoris slides over the anterior acetabular rim during hip flexion-extension.
Proximal rectus femoris bursitis produces anterior hip pain with hip flexion loading, reproduced by resisted straight leg raise and passive hip hyperextension. MRI demonstrates signal change around the reflected head at the anterior acetabular rim, often coexisting with FAI and labral tears. It is addressed as part of arthroscopic FAI surgery. Athletes in kicking sports (football, soccer) are particularly affected due to repetitive eccentric rectus femoris loading.
Anterior hip pain from reflected head rectus femoris bursitis producing anterior groin pain with hip flexion in athletes, identified on MRI and managed arthroscopically as part of FAI surgery.
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