Management of Tibial Shaft Fractures Distal to TKA Prosthesis by Intramedullary Nail: A Report of Three Cases.

INTRODUCTION: Diaphyseal tibial fractures distal to a well-fixed tibial component although rare present a significant challenge and optimal treatment remains controversial. Displaced periprosthetic tibial shaft fractures are ideally treated with open reduction internal fixation with plate osteosynthesis. However, this treatment method is associated with weight-bearing restrictions, which can be difficult for elderly patients with multiple comorbidities and balance impairment. We present our experience of internal fixation with an intramedullary nail that uses an inferior entry point, standard intramedullary tibial nail, and conventional instrumentation.
MATERIALS AND METHODS: Between 2017 and 2018, three patients with acute tibial shaft fractures distal to a TKA (Felix Type 3A) were treated with an intramedullary nail. Preoperative planning involved assessing proximal tibia to ensure adequate room for implant and instrumentation. The average patient age was 66.3 years (range 59-72 years) and all patients were males. All the patients sustained fractures of distal tibial and fibula diaphysis, after a road traffic accident. There were no complications intraoperatively, and all procedures were completed uneventfully. One patient underwent additional fixation of the fibula.
RESULTS: All patients achieved a radiological fracture union after an average of 20.6 weeks. There were no fixation failures, or nonunions postoperatively. There were no new symptoms relative to the TKA that could be attributed to the tibial nailing procedure.
CONCLUSION: We recommend that this technique can be used primarily for this fracture pattern distal to a TKA, provided there is adequate space to accommodate the nail and instrumentation proximally anterior to the tibial tray. © Indian Orthopaedics Association 2020.