Table 1 Brooker's classification of HO after TKA in 1986
From: Heterotopic ossification after alloplastic temporomandibular joint replacement: a case cohort study
Classification | Description |
|---|---|
Grade I | Islands of bone within the soft tissues about the hip |
Grade II | Bone spurs from the pelvis or proximal end of the femur, leaving at least 1Â cm between opposing bone surfaces |
Grade III | Bone spurs originating from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than 1Â cm |
Grade IV | Apparent bone ankylosis of the hip |