weakness in thigh muscle
A physical therapist may recommend exercises to treat thigh weakness caused by a pinched sciatic nerve. Muscle weakness in the hips and thighs is a symptom of myositis. A charley horse is a painful cramp or muscle spasm that is associated with thigh weakness. Bed rest is a common cause of thigh weakness.
Thigh weakness has many causes, including a charley horse, sciatica and spinal stenosis. It can be a side effect of taking certain medications. Extended bed rest or having to wear a cast or other immobilizer for long periods also can lead to thigh weakness. The problem often is accompanied by other symptoms.