The deep head provides DRUJ compression, a function analogous to the rotator cuff at the shoulder. AIN palsy denervates PQ, producing subtle pronation weakness.
| Origin | Distal anterior ulna, deep surface, medial quarter |
|---|---|
| Insertion | Distal anterior radius, deep surface, lateral quarter |
| Nerve Supply | Anterior interosseous nerve (C7, C8, T1) |
| Blood Supply | Anterior interosseous artery |
| Actions |
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|---|
It assists pronation of the forearm and helps compress the radius and ulna together at the distal radioulnar joint.
In distal radius fractures, PQ is elevated for volar plate fixation and must be repaired at closure to restore DRUJ stability. AIN palsy assessment includes specific PQ testing.
Tested by resisted pronation with elbow at 90 degrees to eliminate pronator teres.
Detachment of PQ deep layer compromising DRUJ stability, requiring repair at the time of volar plate fixation.
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