The brachioradialis inserts via a flat tendinous band onto the radial styloid process at the wrist, the most distal insertion of any elbow flexor. This long tendon runs along the lateral forearm surface from mid-forearm to the wrist, where it is palpable and visible as the lateral boundary of the anatomical snuffbox.
The brachioradialis insertion at the radial styloid is released during radial styloidectomy and first extensor compartment decompression for de Quervain tenosynovitis. The tendon is the lateral boundary of the anatomical snuffbox and a key landmark for radial styloid identification. Brachioradialis tendinopathy at the wrist presents as radial wrist pain with resisted elbow flexion in mid-pronation.
Degenerative change at the radial styloid insertion producing radial wrist pain with resisted elbow flexion, managed with activity modification and targeted injection at the styloid.
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