- Decreased neck-shaft angle that is associated with an ossification defect in inferior femoral neck
- Etiology : Developmental, Congenital Acquired, Dysplasia, Cretinism
- Presents with altered gait, short limb, excessive lumbar lordosis
- X rays : Varus neck shaft angle <120 degrees, Short femoral neck, vertical physis, Triangular metaphyseal fragment in inferior femoral neck, Increased Hilgenreiner’s epiphyseal angle (normal <25 degrees), Decreased femoral anteversion
- Operative: indications are Hilgenreiner’s physeal angle > 60°, Hilgenreiner’s physeal angle between 45-60° if symptomatic (e.g. limp & progression of varus), Progressive decrease in neck shaft angle < 110 °
- Surgerical options : Corrective valgus derotation osteotomy, Greater trochanter epiphysiodesis, Greater trochanter transfer
- Valgus osteotomy corrects severe deformity in CCV with improved clinical and radiographic outcomes
- Hilgenreiner-epiphyseal angle should be closed to 38-40 degree or less after surgery
- Complications are Loss of correction and Premature closure of the proximal femoral physis
