Orthonotes
Orthonotes
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Heterotopic Ossification after Hip Arthroplasty

HO = abnormal bone formation in periarticular soft tissues after surgery or trauma. Incidence after THA: 20–50%; clinically significant in 5–10%. Risk factors: male sex, hypertrophic OA, ankylosing spondylitis, previous HO. Classification: Brooker I–IV (X-ray based). Prophylaxis: NSAIDs, radiotherapy; treatment = excision if severe functional limitation.