Which of the following methods is correct for detecting weakness in the brachioradialis muscle?

To detect weakness in the brachioradialis muscle, you should test elbow flexion with the forearm positioned midway between pronation and supination. This position isolates the brachioradialis by minimizing the contribution of the biceps brachii, which is more effective in full supination. During this test, you should observe and feel the brachioradialis muscle. If it remains soft or fails to contract when the elbow flexion is resisted, it indicates weakness in the brachioradialis.