Lower limb alignment correction can improve knee stability in congenital absence of anterior cruciate ligament.

We report the 4-year postoperative outcome of a child with Manner Type I aplasia of the anterior cruciate ligament (ACL) in her left knee and severe genu valgum. The child was experiencing pain, reduced mobility, and frequent left knee locking and instability. The patient was successfully treated with hemiepiphysiodesis (guided growth procedure) of the left knee joint to treat genu valgum deformity using 8-plates, resulting in improvement of knee stability. This spared her major ligament reconstruction of the knee to treat the aplastic ACL, and the patient was able to fully participate in physical activities with peers with no symptoms.