Fibrous tether of the distal femur produced unilateral genu valgus with subsequent patellar dislocation: case report and review of the literature.

Fibrous tether at the distal femur is a rare condition that causes angular deformity of the lower extremity; only 18 cases have been reported previously. We report the case of a 2-year-old boy presenting with unilateral genu valgus. The patient had a subsequent lateral patellar dislocation, 1 year after surgical correction.