Executive Editor: Joseph Schatzker, Richard Buckley

Authors: Michael Castro, Richard Buckley, Andrew Sands, Christina Kabbash

Phalanges

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Glossary

Medial approach to the hallux
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Anatomy

The head of the first metatarsal bone receives its blood supply from an artery which enters the metatarsal head on the plantar aspect of the  distal metaphysis.
The dorsomedial (collateral) digital nerve (in the majority of cases branch of  the deep peroneal nerve) runs on the dorsal half of the medial side, and the medial plantar hallucal nerve runs along its plantar aspect.
The abductor hallucis muscle inserts into the capsule of the metatarso-phalangeal (MTP) joint.


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Skin incision

The skin incision starts at the mid point of the metatarsal head and runs distally towards the mid diaphysis of the distal phalanx.


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Capsulotomy

In order to expose the metatarsal head the capsule must be freed from the bone on both the dorsal and plantar aspect.
This allows visualization of the metatarso-phalangeal (MTP) joint, and of the metatarso-sesamoidal joint.
To expose fractures involving the base of the distal phalanx one must make an interphalangeal capsulotomy and arthrotomy.


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Extension of the approach

For diaphyseal fractures and diaphyseal osteotomies, one must extend the approach more proximally.
If necessary the approach can be extended along the medial aspect of the foot. The guide throughout is the abductor hallucis, which is retracted plantarwards.


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Visualization of the medial sesamoid

Visualize the medial aspect of the medial sesamoid by releasing the metatarsosesamoidal ligament.

v2.0 2017-03-23