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Triangular Ligaments of Finger
Connective Tissue

Triangular Ligaments of Finger

Ligamentum triangulare digiti

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Anatomical Relations

The triangular ligaments sit on the dorsal aspect of the digital expansions, distal to the proximal interphalangeal joint (Colzani et al., 2016).

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The triangular ligaments connect the lateral tendinous bands across the middle phalanx (Colzani et al., 2016).


The ligament prevents separation and anterior displacement of the lateral bands during flexion of the proximal interphalangeal joint.

List of Clinical Correlates

—Boutonniere deformity


Colzani, G., Tos, P., Battiston, B., Merolla, G., Porcellini, G. and Artiaco, S. (2016) 'Traumatic Extensor Tendon Injuries to the Hand: Clinical Anatomy, Biomechanics, and Surgical Procedure Review', J Hand Microsurg, 8(1), pp. 2-12.

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Laxity of the TMJ ligaments → hypotonus of the temporal and masseter muscles → dropping of the jaw.

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