MALUNITED PAEDIATRIC MONTEGGIA FRACTURES

Abstract

Osteotomy of ulna with fractional distraction maintains ulnar length and reduced position of radial head via interrosseous membrane.

We reviewed 9 patients, 5:M, 4:F, aged 2–14 years. Interval between injury and surgery ranged 2–36months but in seven patients the repositioning was performed within 6 months. All had elbow deformity with radial head prominence. 6 patients had restricted movements of elbow. 3 had pain on movements.

2 x 2mm k-wires each, proximal and distal to ulnar osteotomy. Distal k-wires were transfixed in radius in complete supination (during distraction of ulna, radius is pulled down). ‘Z’/‘Transverse’ osteotomy was then performed subperiosteally. Ulna lengthened by fractional distraction. Axial k-wire in ulna was used in selected patients to prevent any angular deformity from developing at osteotomy site during distraction. Latency period was 7 days, Distraction rate was 0.8mm/day. Radial head position was monitored by weekly x-rays. Static fixator time was 2 x (distraction time) so as to allow time for consolidation of new-bone. Total fixator time was 6weeks followed by fixator removal and brace for 2weeks with elbow-joint physiotherapy.

Distraction corrected ulnar deformity, restored ulnar length and repositioned radial head in anatomical position. Average ulnar length gained was 14mm. Duration of distraction was 17 days. Average follow-up was 2 years (1.5 – 4years). We achieved full, painless, stable elbow flexion, extension, pronation and supination movements in eight but one patient. Pronosupination movement did not deteriorate over four years of our study. No patient developed myositis ossificans or neurodeficit. 2 patients had minor pin-tract infection, which responded to basic treatment.

Safe, effective and fully controlled method. This technique may be considered before open procedures for radial head is undertaken.