M24 with exertional hypogastric pain. Tender symphysis pubis on physical examination & provisional clinical diagnosis of osteitis pubis. Referred for groin ultrasound (a study which routinely includes imaging of the hip joints).
Acetabular labral tear with underlying cam-type femoro-acetabular impingement.
There is a strong association between pelvic instability and hip pathology. Ultrasound findings in this case included tenderness over the anterolateral-to-superior acetabular labrum where a prominent paralabral cyst (arrowheads) with underlying labral tear (solid arrow) could be seen. Also note changes of subcortical cyst (dashed arrow) and bony Ganz bump (asterisk) at the subcapital aspect of femoral neck, consistent with cam-type femoro-acetabular impingement.