Identify a common intraoperative fracture during knee arthroplasty and its typical management.

• A. Tibial plateau fracture; management always with cancellous screws.
• B. Fracture of the patella; management involves immediate prosthesis exchange.
• C. Fracture of the fibula near the knee; managed with casting.
• D. Supracondylar femoral fracture; management may involve cerclage wires or plate fixation depending on fracture pattern and fixation stability.

Answer: (D)

In knee arthroplasty, a supracondylar femoral fracture is the most common intraoperative injury, usually occurring in the distal femur during preparation or implant insertion when bone quality is poor or when there is forceful retractor use or varus/valgus stress. The way it’s treated depends on the fracture pattern and how stable the fixation will be with the prosthesis in place. If the fracture is simple and the implant remains stable, stabilization with cerclage wires or cables can hold the fragments while preserving the prosthesis. If the fracture is more unstable, comminuted, or bone quality is poor, adding plate fixation (often a locking plate) provides the necessary stability to restore alignment and allow early knee motion. This approach explains why the supracondylar femoral fracture is the best choice and why its management is tailored to fracture stability and pattern.