Upper limb

Quadrate ligament (Denucé's ligament)

Ligamentum quadratum (Denucé)

Origin

Inferior border of radial notch of ulna

Insertion

Medial surface of neck of radius

Function

Reinforces the inferior capsule of the superior radioulnar joint; limits spin rotation in full pronation and supination

Innervation

Posterior interosseous nerve (C5–C7)

Movement & chain

Taut at extreme ranges of pronation and supination

Palpation

Deep intra-articular, non-palpable

Clinical

Torn in radial head dislocations and complex proximal radioulnar joint instability.

Segmental innervation

C5–C7

In clinical practice

Restoration of terminal forearm pronosupination arc in physical therapy

Region in the model

Upper limb