Degenerated acetabulum (A-B) undergoes remodelling, with severe osteophyte formation (blue arrowheads) at the cranial effective acetabular rim and caudal acetabular edge. Evidence of subchondral bone degradation was observed on the entire surface of the right (R) and left (L) acetabulum. A normal acetabulum (C) is characterized by smooth acetabular edge, surface and bone.