Lengthening of the humerus for upper extremity limb length discrepancy.

We present a case of humeral lengthening for a limb length discrepancy of 7.7 cm due to proximal humeral growth arrest in a 12-year-old boy. Lengthening of 69 mm was achieved using the Wagner technique. Bone grafting was not required. Humeral lengthening may be performed for upper extremity limb length discrepancy with good results. Objectives of treatment must include protection of the radial nerve from traction injury and from entrapment in the osteotomy site. Elbow extension may be lost during lengthening, but in the adolescent age group, full return of elbow motion can be expected.