Figure 2.

A 9-year-old boy with Perthes' disease of the left hip. He had had pain in his left knee and limping for 2 months prior to diagnosis. A and B. At the time of diagnosis, showing Perthes' disease classified as Catterall group 4 and lateral pillar group C. C. At 5-year follow-up, showing poor radiographic outcome with flattened left femoral head.