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Table 1 The Criteria Define of Stulberg Classifications

From: Monobloc implants in cementless total hip arthroplasty in patients with Legg-Calve-Perthes disease: a long-term follow-up

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