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Knee injury is one of the most common reasons people see their doctors. Your knee is a complex joint with many components, making it vulnerable to a variety of injuries. Many knee injuries can be successfully treated with simple measures, such as bracing and rehabilitation exercises.
Standing with your knees locked back in hyperextension can cause a host of problems in your knees and also in your legs, hips, and spine. In addition to overstretching the ligaments, hyperextension stresses the front of the knee joint surfaces and weakens the quadriceps muscles.