With the patient supine on the examining table, ask her to lift her leg, with the knee extended, off the table (thigh flexion) as high as she can and then slowly put it down. Have her do this several times with one leg. Then ask her to repeat the movement with the other leg.
If one leg is weak or spastic or has an involuntary movement or a proprio-ceptive sensory defect, this simple leg-raising test will help you identify it. It is a useful lateralizer, if not a localizer, and is similar to, but less sensitive than, arm drift.
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