Infected nonunion of the upper extremity

Forearm Nonunions-From Masquelet to Free Vascularized Bone Grafting

Forearm fractures present a unique challenge due to the anatomic relationship of the radius relative to the ulna. Associated with the complexity of the treatment for these fractures is the management of nonunion and malunion of the radius and ulna. Evaluation and management of forearm nonunions require a critical evaluation of contributing factors prior to surgical intervention. Timely and precise treatment of nonunion and malunion is necessary to restore function of the forearm.

Induced Membrane Technique for the Treatment of Infected Forearm Nonunion: A Retrospective Study

PURPOSE

Infected forearm nonunion remains a challenge for the hand surgeon. Autologous bone grafting within an induced membrane following implantation of a cement spacer, also known as the Masquelet technique, is a procedure used for addressing segmental bone defects. This report summarized our experience using this technique to treat the infected forearm nonunion.

METHODS

We retrospectively reviewed a series of 32 patients treated for infected forearm nonunion by the 2-stage Masquelet technique between 2009 and 2018. There was an infected nonunion of the ulna in 28 patients and an infected nonunion of the radius in 4 patients. All patients had undergone an average of 2.7 procedures before presenting at our institution. Treatment involved a staged procedure in which an antibiotic-impregnated cement spacer was implanted into the bone defect following debridement without internal fixation. It was left in place for 4-6 weeks, during which time a membrane formed around the cement spacer. In the second stage, the induced membrane was incised, and the cement spacer was removed. The defect was then filled with cancellous autograft with the addition of internal fixation. Postoperative radiographs were taken for the evaluation of bone healing. The functional results of the affected forearm were evaluated for motion loss of elbow or wrist and rotation loss of forearm.

RESULTS

All nonunions healed without recurrent infection or loosening of internal fixation at the time of final follow-up. All the patients showed substantial functional improvement, with excellent results in 14 patients, satisfactory results in 13, and unsatisfactory results in 5.

CONCLUSIONS

The induced membrane technique is an effective solution for infected forearm nonunion.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Forearm Nonunion: Characterization and Management

Adult forearm nonunion should be investigated prior to developing a treatment strategy: "Why did the fracture not heal?" Optimizing the patient's biology and the stability at the nonunion site are critical for a successful outcome. This review concisely discusses the initial work-up, including history, physical examination, imaging, and laboratory testing, as well as available surgical techniques-irrigation and debridement with deep cultures, revision open reduction internal fixation with or without biological adjuvant therapies, cancellous autograft, tricortical iliac crest, reamer/irrigator/aspirator, allograft, vascularized free-fibula and induced-membrane technique.