Open Reduction and Treatment with Bone Morphogenetic Protein-2 for Correction of Closed Tibial Pseudoarthrosis in a 32-Year-Old Non-smoking Male with Osteoporosis and Hypogonadism: A Case Report.

INTRODUCTION: Bone morphogenetic protein-2 (BMP-2) is an osteoinductive growth factor approved for use in interbody spinal fusion and open tibial shaft fractures. Reports of its off-label application exist, but there is limited documentation regarding its use in closed tibial pseudoarthrosis. This case is notable as one of the first to describe the successful use of BMP-2 in a young male with osteoporosis and hypogonadism, conditions that further complicate fracture healing.

CASE REPORT: A 32-year-old non-smoking Caucasian male sustained a Gustilo-Anderson grade 1 open fracture of the left tibia and fibula, initially treated with intramedullary nailing. The proximal interlocking screw was later removed for dynamization to promote axial loading, but radiographs demonstrated inadequate tibial healing. He subsequently underwent exchange intramedullary nailing with proximal and distal interlocking, fibular osteotomy, preparation of the tibial non-union site, and bone grafting from the fibular osteotomy. Despite these interventions, progressive radiographs continued to demonstrate inadequate healing. Workup revealed osteoporosis (lumbar T-score -2.5) and hypogonadism (testosterone 200 ng/dL). Medical optimization was initiated with testosterone supplementation and teriparatide injections. Due to persistent pseudoarthrosis, the patient ultimately underwent open preparation of the tibial non-union site with eburnation, application of recombinant BMP-2, and iliac crest autograft. Subsequent radiographs demonstrated healing of both the tibia and fibula, with mild valgus alignment that was clinically insignificant. The patient was pleased with the results and is doing better overall.

CONCLUSION: Eleven months after surgery, the tibia demonstrated radiographic healing with no significant complications. This case highlights the potential role of BMP-2 as an adjunctive therapy for difficult-to-heal closed tibial pseudoarthrosis, particularly in the setting of metabolic bone disease. Its successful use in this patient suggests that it may expand treatment options for refractory non-union beyond currently approved indications, contributing to broader orthopedic practice.