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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.
What causes it? The most common causes of knee weakness are osteoarthritis, sprain or strain, and chronic knee pain. Within all the people who go to their doctor with knee weakness, 89% report having knee pain, 47% report having knee swelling, and 20% report having leg weakness.