Official Journal of the Italian Society of Orthopaedics and Traumatology
Table 1 Modified Brooker staging system
Class | Radiographic findings |
|---|---|
Grade 0 | No sign of heterotopic ossification |
Grade I | Bony islands in the soft tissue around the hip |
Grade II | Exophytes in the pelvis or proximal end of the femur with at least 1Â cm between opposing bone surfaces |
Grade III | Exophytes in the pelvis or proximal end of the femur with less than 1Â cm between opposing bone surfaces |
Grade IV | Bony ankylosis between proximal femur and pelvis |