Distal Tarsal Tunnel Space

spatium canalis tarsi distalis

The distal tarsal tunnel is the continuation of the tarsal tunnel beneath the abductor hallucis muscle, where the medial and lateral plantar nerves and vessels run in separate fibrous channels toward the sole. Compression here, often by a tight abductor hallucis fascia, causes burning pain and numbness in the sole (distal tarsal tunnel syndrome).

Anatomical Data

Boundaries & Contents

Location	Inner side of the hindfoot, beneath abductor hallucis
Boundaries	Abductor hallucis and its deep fascia (roof and medial wall) Medial calcaneus and quadratus plantae (floor and lateral wall) Fibrous septum separating the medial and lateral plantar channels
Contents	Medial plantar nerve and vessels Lateral plantar nerve and vessels First branch of the lateral plantar nerve (inferior calcaneal nerve) nearby

Biomechanics

Function & Actions

Carries the plantar nerves and vessels from the tarsal tunnel into the sole in separate fibrous channels. Tight abductor hallucis fascia here can compress them.

Clinical Relevance

Clinical Notes

Tarsal tunnel syndrome produces medial ankle and plantar foot burning and numbness from tibial nerve compression under the flexor retinaculum. The proximal tarsal tunnel (at the medial malleolus) is the most common compression site, but distal compression at the master knot of Henry (where FDL and FHL cross) is also clinically significant. Tinel's sign at the medial ankle reproduces the symptoms. Surgical tarsal tunnel release must address all compartments of the tunnel.

Pathology

Common Injuries & Conditions

Tarsal Tunnel Syndrome

Tibial nerve compression in the tarsal tunnel producing plantar burning, numbness, and intrinsic foot muscle weakness, confirmed by nerve conduction studies and managed by tarsal tunnel surgical decompression.

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