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Quadriceps weakness can be caused by various injuries to the knee or hips, acquired myopathies (diseases that affect muscle tissue) such as Lyme disease and poliomyelitis, inherited myopathies such as certain muscular dystrophies and stroke, or neurological diseases such as multiple sclerosis or Bellâs palsy.
The quadriceps tendon works with the muscles in the front of your thigh to straighten your leg. Small tears of the tendon can make it difficult to walk and participate in other daily activities. A large tear of the quadriceps tendon is a disabling injury. It usually requires surgery and physical therapy to regain full knee function. Quadriceps tendon tears are not common. They most often occur among middle-aged people who play running or jumping sports.