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Brooker classification.
| Grade | 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 1 cm between opposing bone surfaces |
| Grade III | Bone spurs from the pelvis or proximal end of the femur, reducing the space between opposing bone surfaces to less than one centimeter |
| Grade IV | Apparent bone ankylosis of the hip |
