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Brooker classification of heterotopic ossification [20]
| Degree | Description |
|---|---|
| I | Islands of bone within the soft tissue about the hip |
| II | Bone spurs from the pelvis or proximal end of the femur, leaving at least 1 cm between opposing bone surfaces |
| III | Bone spurs from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than 1 cm |
| IV | Apparent bone ankylosis of the hip |
