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 | Primary forearm pronator at all speeds; Stabilises the DRUJ by compressing the radius against the ulna |
|---|
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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