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Table 1 Brooker classification of heterotopic ossification in the hip

From: Severity of heterotopic ossification in patients following surgery for hip fracture: a retrospective observational study

Class

Definition

1

Islands of bone within the soft tissues about the hip

2

Bone spurs from the pelvis or proximal end of the femur, leaving at least 1 cm between opposing bone surfaces

3

Bone spurs from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than 1 cm

4

Apparent bone ankylosis of the hip