Windlass Mechanism
Pronunciation: WIN-lass MEK-uh-niz-um
The biomechanical process by which dorsiflexion of the toes tightens the plantar fascia, raising the medial longitudinal arch and supinating the foot during propulsion.
Full Definition
First described by Hicks (1954), the windlass mechanism likens the plantar fascia to a cable wrapped around a windlass (capstan). When the hallux and lesser toes dorsiflex at toe-off, the plantar fascia is tensioned, shortening the distance between the calcaneus and metatarsal heads, thereby elevating the arch and converting the foot into a rigid lever. This stiffening is essential for efficient propulsion. Impaired windlass function — due to hallux rigidus, fascia pathology, or orthotic restriction — reduces propulsive efficiency. Editors should be aware this term is styled as a noun phrase and is not hyphenated.
Usage
Usage note: Always two words, no hyphen. Not to be confused generically with 'arch support mechanism'; the windlass mechanism is a specific anatomical and biomechanical concept.
In Context
- "Restricted dorsiflexion at the first metatarsophalangeal joint impaired the windlass mechanism, reducing propulsive force at late stance." — Biomechanical assessment report
- "The orthotic design incorporated a Morton's extension to restore windlass mechanism function in a patient with hallux rigidus." — Orthotic prescription documentation