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The brachioradialis is a stronger elbow flexor when the forearm is in a midposition between supination and pronation at the [[Proximal radioulnar articulation|radioulnar joint]]. When pronated, the brachioradialis is more active during elbow flexion since the biceps brachii is in a mechanical disadvantage.
With the insertion of the muscle so far from the fulcrum of the elbow, the brachioradialis does not generate as much joint torque as the [[brachialis]] or the biceps. It is effective mainly when those muscles have already partially flexed at the elbow. The brachioradialis
The muscle is used to stabilize the elbow during rapid flexion and extension while in a midposition, such as in hammering. The brachioradialis is synergistic with the brachialis and biceps brachii; the triceps brachii and [[anconeus muscle|anconeus]] are antagonistic.<ref>Bowden, Bradley S. Bowden, Joan M. An Illustrated Atlas of Skeletal Muscles. 2nd ed. 2002</ref><ref>Saladin, Kenneth S. Anatomy & Physiology. 4th ed. 2007</ref>
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