The medial head of FHB inserts via the medial sesamoid and is primarily responsible for the medial sesamoid position during push-off. The medial head is the component addressed in hallux valgus surgery when the medial sesamoid is displaced.
| Origin | Cuboid and medial cuneiform plantar surface |
|---|---|
| Insertion | Medial base of the hallux proximal phalanx via the medial sesamoid |
| Nerve Supply | Medial plantar nerve (S1, S2) |
| Blood Supply | Medial plantar artery |
| Actions | Flexes the hallux MTP joint — medial contribution; Stabilises the medial sesamoid during push-off |
|---|
Medial sesamoid instability from medial FHB head laxity contributes to hallux valgus deformity progression. In hallux valgus surgery, the medial capsule and medial FHB head are tightened as part of the medial soft tissue repair.
Palpated plantar-medial to the first MTP joint during hallux MTP flexion.
Medial sesamoid displacement from medial head FHB capsular laxity, addressed by medial capsulorrhaphy during hallux valgus correction.
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