History: 20 yo with right hip pain
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Case 27 Answer
Same hip here.
This one is a bit more advanced. Notice the shape of the femoral head or more specifically the femoral head/neck junction. It has a bulge/excrescence out laterally. This is what we see with a so called CAM deformity or pistol-grip deformity (https://radiopaedia.org/images/25707973) associated with Femoroacetabular impingement (FAI).
With extreme flexion, the bump can hit the acetabular lip tearing the acetabular labrum (so called CAM-type FAI).
This contrasts to a prominent spur off the acetabulum which “pinches” the labrum with a similar result (pincer-type FAI).
Ortho simple write-up: https://orthoinfo.aaos.org/en/diseases–conditions/femoroacetabular-impingement
Radiology write-up: https://radiopaedia.org/articles/femoro-acetabular-impingement