Femur Fracture Associated with Knee Brace Wear in the Motocross Athlete: A Report of Two Cases and Review of the Literature

Figure 4

Representative sketch of proposed mechanism of injury. (a) As the leg is subjected to an extension moment, the knee brace extends to its terminal extension point. At this point, further extension force is exerted primarily at the proximal and distal ends of the brace. This force is then absorbed, obligatorily, by the femur at the proximal end of the brace. When this force exceeds the femur’s ability to withstand this bending force, it (b) fractures.

(a)

(b)