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Major and minor risk factors for Heterotopic Ossification (HO).
| Major factor | Minor factors |
|---|---|
| Previous history of HO | Hypertrophic osteoarthritis |
| Diffuse idiopathic skeletal hyperostosis | |
| Ankylosing spondylitis | |
| Prior surgery | |
| Multiple injuries | |
| Fracture with dislocation | |
| Extent of surgical approach |
