Heterotopic Ossification of the Hip Wheeless

Description: Wheeless' Textbook of Orthopaedics
- typically develops on x-ray 3-8 wks postop in pericapsular area of the affected hip joint; - over all incidence is 50% (1/3 of these are clinically significant); - risk factors: - male gender (uncommon in females); - active AS; - DISH - post traumatic arthritis; - heterotrophic osteoarthritis - previous HO; - previous hip fusion; - Paget's disease - Parkinson's disease - excessive osteophytosis or enthesiopathic radiographic changes on AP of pelvis; - head injury and/or spinal cord injury;