Instruct the patient to elevate the knee, with the foot resting on the bed. Place your left hand under the knee. Ask the patient to straighten the leg against the resistance of your right hand, which is placed on the patient's shin. This procedure tests extension of the knee by the femoral nerve from roots L2 to L4. This test is illustrated in Figure 21-33.
Figure 21-31 Technique for testing hip abduction.
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