Morton's Extension
An orthotic modification involving a rigid plate that extends under the first metatarsophalangeal joint to limit its dorsiflexion and reduce pain.
Full Definition
A Morton's extension is an insole or footwear modification in which a rigid or semi-rigid plate is incorporated beneath the first metatarsophalangeal joint to prevent dorsiflexion, primarily used in the management of hallux rigidus and turf toe. The term derives from Dr Dudley Joy Morton, and the apostrophe and capital M must be preserved in editorial use. Editors must distinguish this from Morton's neuroma, an entirely different condition affecting the intermetatarsal nerve. The two 'Morton's' terms are a known confusable pair in orthotic and podiatric copy.
Usage
Usage note: Retain apostrophe and capital M (Morton's). Do not confuse with Morton's neuroma, which is an interdigital nerve entrapment condition, not an orthotic device feature.
In Context
- "A Morton's extension was incorporated into the carbon-fibre orthosis to reduce first MTP joint loading." — Orthotic workshop fabrication note
- "Copy editors must ensure 'Morton's extension' and 'Morton's neuroma' are not conflated, as they describe entirely different structures." — Editorial training note