The lateral band (lateral cord) of the plantar aponeurosis is one of its three parts, alongside the large central part and the thin medial part. It runs along the lateral border of the sole from the lateral process of the calcaneal tuberosity to the base of the fifth metatarsal, covering abductor digiti minimi.
| Origin | Lateral process of the calcaneal tuberosity |
|---|---|
| Insertion | Base of the fifth metatarsal |
Supports the lateral longitudinal arch, distributes load along the lateral column during gait, and forms the plantar covering of the abductor digiti minimi compartment.
Lateral plantar fasciitis is less common than central (medial heel) plantar fasciitis but produces lateral heel and lateral sole pain, with ultrasound showing thickening of the lateral band. Its insertion lies close to the fifth metatarsal tuberosity, where avulsion fractures must be distinguished on radiographs. Excessive release of the plantar fascia in surgery for recalcitrant plantar fasciitis can overload the lateral column and cause lateral foot pain, so only the medial part is usually divided.
Lateral band plantar fascia degeneration producing lateral heel and plantar foot pain, managed by lateral arch support and targeted injection.
Lateral foot pain after extensive plantar fascia release, as load shifts to the lateral column when the aponeurosis is weakened.
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