In total knee arthroplasty (TKA), the knee femoral component replaces the bone surfaces and cartilage on the distal femur (thigh bone) that have been damaged due to injury or disease. While success rates are high with TKA, some fractures of the femoral component have occurred clinically (Fig. 1 and 2) [1]. Understanding the nature of these fractures is critical since the industry is moving towards bone conserving designs, minimally invasive approaches, new materials and new technologies for TKA. At the same time patient requirements are changing as patients are heavier, younger, and more active.

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