Table 1 The Criteria Define of Stulberg Classifications
Classification | Criteria Define |
|---|---|
Class I | A completely normal hip joint |
Class II | A spherical femoral head (same concentric circle on anteroposterior and frog-leg lateral radiographs), but with one or more of the following abnormal characteristics of the femoral head, neck, or acetabulum: |
(1) Larger than normal (although spherical) femoral head (coxa magna); | |
(2) Shorter-than-normal femoral neck; | |
(3) Abnormally steep acetabulum | |
Class III | A non-spherical (ovoid, mushroom-shaped, or umbrella-shaped) but not flat femoral head. Abnormal characteristics of the femoral head, neck, and acetabulum (as described for Class II) are present also. |
Class IV | A flat femoral head and abnormalities of the femoral head, femoral neck, and acetabulum |
Class V | A flat femoral head and a normal femoral neck and normal acetabulum |