Heterotopic ossificaiton最常使用的分類為Brooker classificaiton:
Class I: Islands of bone within the soft tissue about the hip.
Class II: Bone spurs from the pelvis or proximal end of the femur, leaving at least 1 centimeter between opposing bone surfaces.
Class III: Bone spurs from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than one centimeter.
Class IV: Apparent bone ankylosis of the hip.
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