Treatment of Tibial and Femoral Bone Defects With Bone Transport Over an Intramedullary Nail.

OBJECTIVES: To evaluate the results of the bone transport over an intramedullary nail (BTON) technique for the treatment of segmental bone defects. DESIGN: Retrospective review of case series. SETTING: Level 1 trauma center. PATIENTS/PARTICIPANTS: We included 40 patients who underwent reconstruction of the lower limb with BTON technique between 2000 and 2018. The technique was performed in the tibial segments in 21 patients and in the femoral segments in 19 patients. INTERVENTION: The surgical technique was performed in 2 stages for patients with infected nonunion. Infection was eradicated in all patients at the first stage. For the BTON at the second stage, monolateral external fixators and circular external fixators were used for femoral and tibial defects, respectively. In cases of defects without any infection, debridement with a single-stage BTON was performed. MAIN OUTCOME MEASUREMENTS: Complications as well as radiological and clinical results were evaluated according to the criteria of Paley-Maar. RESULTS: Minor complications occurred in 11 patients: pin site problems (9), cellulitis (1), and skin detachment due to Schanz screw (1). Major complications occurred in 8 patients: docking site nonunion (4), early consolidation and Schanz screw failure (1), knee flexion contracture (1), and ankle equinus contracture (2). Four patients had osteomyelitis as residual sequelae. Bone score was excellent in 27 patients. Excellent functional results were obtained in 31 patients. CONCLUSIONS: The BTON technique is associated with low cost because of the short treatment period, low complication risk, and rapid rehabilitation and is not limited by the amount of bone transport. LEVEL OF EVIDENCE: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.