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