The long-term prognosis of LCPD Catterall type 2 and 3 is relatively benign. However, more than 50% of the patients will develop signs of osteoarthritis between the 4th and 5th decades. At the latest follow-up a strong increase in the number of cases with osteoarthritis was seen. Sphericity of the femoral head is an important predicting factor in the development of osteoarthritis.
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