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tendon rupture of quadriceps femoris

The knee extension device consists of quadriceps femoris, patella and patellar tendon. When the peak contraction force of quadriceps femoris exceeds the mechanical load limit of a weak part of the knee extension device, it will lead to the fracture of the knee extension device, including patellar fracture. The fracture of knee extension device can be incomplete fracture, that is, the microscopic tear of some collagen fibers...

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