Orthosis
Pronunciation: or-THOH-sis
An externally applied device designed to modify the structural or functional characteristics of the neuromuscular and skeletal system.
Full Definition
An orthosis is a brace, splint, or support worn externally on the body to correct alignment, support weakened structures, or restrict unwanted movement, without replacing any body part. Common examples in rehabilitation include ankle-foot orthoses (AFOs), knee-ankle-foot orthoses (KAFOs), and spinal orthoses. The plural is 'orthoses'. Editors must distinguish between 'orthosis' (the device) and 'orthotics' (the clinical field or discipline) — a common source of error in rehabilitation manuscripts. The adjective form is 'orthotic', as in 'orthotic device'.
Usage
Usage note: Use 'orthosis' for the device and 'orthotics' for the discipline. 'Orthotic' is an adjective (e.g., 'orthotic insole'), never a standalone noun in formal copy.
In Context
- "A custom ankle-foot orthosis was fabricated to support the patient's foot drop during ambulation." — Prosthetics and orthotics prescription
- "The report described the orthosis design parameters in accordance with ISO 8549-1 nomenclature." — Technical product documentation