Refractory Tibial Insufficiency Fracture Nonunion Healed with Parathyroid Hormone Level Correction: A Case Report

INTRODUCTION: Insufficiency fractures are uncommon injuries, but may occur in the lower extremity due to repetitive stress on abnormal bone tissue. Management of these injuries may include weight bearing restrictions, bracing, or even surgical intervention. In addition, a proper metabolic healing environment is required to encourage healthy bone growth following an injury. CASE PRESENTATION: This case report discusses a patient who underwent surgical repair of a closed nondisplaced proximal tibia insufficiency fracture. Several reoperations were required due to hardware failure and bone resorption following operative nonunion repair. It was determined that her elevated PTH due to end-stage renal disease (ESRD) likely inhibited bone regeneration during the course of her treatment. A successful kidney transplant rapidly normalized the patient’s PTH levels and permitted bony healing of her tibial stress fracture. CONCLUSION: Several studies have demonstrated a relationship between metabolic abnormalities and fracture healing. We are the first to present a case where bony union in an ESRD patient with secondary hyperparathyroidism was only achieved following a kidney transplant. Surgeons should be cognizant of the effect that metabolic abnormalities may have in the development of insufficiency fractures and subsequently achieving bony union following such fractures.