To evaluate the outcome of intertrochanteric varus open wedge osteotomy in LCP in patients over 9 years old.

Thirty-three patients over 9 years old, who were diagnosed with LCP were treated by intertrochanteric varus open wedge osteotomies, from August 1989 to August 2002. The mean age of the patients was 10.2 years old (range, 9 to 14 years old), with a mean duration of follow-up of 7.7 years (range, 3.2 to 14.1 years). According to the Harring classification system, there were 3 group A, 21 group B, and 11 group C patients. There were thirty male and three female patient. There were 2 cases of female patients with bilateral extremity involvement of LCP. Radiographic outcome was assessed utilizing Stulberg's classification to grade residual deformities.

10 cases were Stulberg classes I and II (spherically congruent), 15 were classes III and IV (aspherically congruent), and 10 were class V (aspherically incongruent). Less involvement of the disease and treatment in the early stages produced better outcomes.

Intertrochanteric varus open wedge osteotomy is a reliable treatment for LCP after the age of 9 years old, if the disease is evaluated individually according to the extent and stage of its involvement.