Similarities | |
| |
Distinguishing features | |
Primary OA | Acromegalic arthropathy |
Affects a sizable minority of population (35% of general population with radiographic OA of knee[1]) | 70 to 90% of patients with acromegaly have radiographic joint involvement |
Radiographic features: Joint space narrowing, osteophyte formation, and subchondral cysts | Radiographic features: In initial stages, joint space widening may occur; in later stages, osteophyte formation may predominate over joint space narrowing (only 1/3 of hip disease with cartilage narrowing[2]) |
Classic sites of involvement in OA: DIP joints, PIP joints, base of thumb, lumbar and cervical spine, hip, knee, 1st MTP joint | OA in joints that shouldn't get OA: Involvement of MCP joints, shoulder, elbow, and others can occur due to disruption in normal cartilage growth and metabolism |
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