orthosis
Pronunciation: or-THOH-sis (singular); or-THOH-seez (plural)
An externally applied device designed to support, align, correct, or compensate for a neuromuscular or musculoskeletal impairment.
Full Definition
An orthosis (plural: orthoses) is a custom-made or off-the-shelf external device applied to the body to modify structural or functional characteristics of the neuromusculoskeletal system. In geriatric rehabilitation, commonly prescribed orthoses include ankle–foot orthoses (AFOs) for foot drop following stroke, knee orthoses for osteoarthritic instability, and wrist orthoses following distal radius fracture. Editors must note the correct plural form 'orthoses' (not 'orthosises') and distinguish the term from 'prosthesis', which replaces an absent body part rather than supporting a present one. The adjectival form is 'orthotic'.
Usage
Usage note: Plural is 'orthoses', not 'orthosises'. Distinguish clearly from 'prosthesis'. The adjective form is 'orthotic' (e.g., orthotic device).
In Context
- "The orthotist fitted a custom ankle–foot orthosis to correct the patient's foot drop and reduce falls risk during ambulation." — Allied health progress note
- "Bilateral wrist orthoses were prescribed to maintain neutral wrist alignment during sleep and reduce pain from rheumatoid arthritis." — Occupational therapy equipment prescription