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Table 1 Brooker classification of heterotopic ossification [6]

From: Prophylaxis of heterotopic ossification – an updated review

Grade 1 Islands of bone within the soft tissues about the hip
Grade 2 Bone spurs from the pelvis or proximal end of the femur, leaving at least one centimeter between opposing bone surfaces
Grade 3 Bone spurs from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than one centimeter
Grade 4 Apparent bone ankylosis of the hip