Orthosis
Pronunciation: or-THO-sis
An external device applied to the body to modify structural or functional characteristics of the musculoskeletal system.
Full Definition
An orthosis is an externally applied device designed to modify the structural and functional characteristics of the neuromuscular and skeletal systems. Common examples include ankle-foot orthoses (AFOs), knee-ankle-foot orthoses (KAFOs), and spinal orthoses. These devices are prescribed to provide support, correct deformity, protect weak muscles, improve function, or reduce pain. In rehabilitation medicine, orthotists work closely with the rehabilitation team to design and fit custom orthotic devices. The plural form is 'orthoses,' not 'orthosises.'
Usage
Usage note: Plural is 'orthoses.' Often confused with 'prosthesis,' which replaces a missing body part.
In Context
- "The patient was fitted with a custom ankle-foot orthosis to improve gait mechanics." — Treatment documentation
- "Multiple orthoses were trialed before finding the optimal fit for this patient." — Progress note