A Long-standing Monteggia Fracture in a Child who underwent Bone Lengthening and Annular Ligament Reconstruction: A Case Report

INTRODUCTION: Monteggia fractures are rare and account for 1% of all pediatric forearm fractures. Dislocation of the radial head with plastic deformation of the ulna is particularly rare and can be overlooked, thereby resulting in long effects. Here, we report the treatment of a case of a long-standing Monteggia fracture in a child. CASE REPORT: A 6-year-old girl who was injured by a fall was examined by a local physician. 4 weeks later, she was referred to our hospital. Plain X-ray and computed tomography revealed a long-standing Monteggia fracture. Ulnar osteotomy was performed; however, complete realignment was not achieved. Scar tissue and the annular ligament remained intact, thereby hindering complete reduction. The scar tissue surrounding the radial head was surgically removed, and subluxation was reduced. The annular ligament was reconstructed, and the ulna was lengthened by external fixation. 1 year postoperatively, the patient’s elbow range of motion is good, and there has been no recurrence of radial head dislocation. CONCLUSIONS: The patient achieved good progress through the use of annular ligament reconstruction and ulnar osteotomy to straighten and anatomically realign the ulna. Post-operative repeat dislocation was avoided by reducing radial head dislocation, removing the scar tissue, and reconstructing the annular ligament.