What does ankylosed mean?
Ankylosed describes a joint that has become permanently stiff or immobile because the bones forming it have fused together — a condition known medically as ankylosis. Where a healthy joint allows smooth movement between two bones, an ankylosed joint behaves like a single rigid unit: the gap between the bones has been bridged by fibrous tissue or new bone. This can result from chronic inflammatory diseases such as rheumatoid arthritis or ankylosing spondylitis, from infection or injury, or it can be created deliberately by surgeons performing a fusion procedure to relieve pain. The word derives from the Greek ankylós, meaning 'crooked' or 'bent', a root it shares with the words anchor and angle. Largely confined to medical and scientific writing, ankylosed carries a distinctly clinical tone; readers encounter it most often in discussions of arthritis, spinal fusion, and joint pathology, where precision about loss of movement matters.
adjective(Of a joint or body part) stiffened or immobile as a result of ankylosis — the abnormal fusion or bony union of bones that normally form a movable joint.
- (Of a joint) permanently stiffened or immobilized by the fusion of bones across the joint, typically through disease, injury, or surgical fusion.
"Years of untreated arthritis had left his fingers painfully ankylosed."
"After decades of rheumatoid arthritis, several of her finger joints had become completely ankylosed."
"Surgeons deliberately ankylosed the damaged vertebrae during the spinal fusion procedure."
The Greek root behind 'ankylosed' — ankylós, 'crooked' — is the same ancient root that gave us 'anchor' and 'angle': all about things bent out of true.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ankylosed
Ankylosed traces back to the Greek adjective ankylós, meaning 'crooked' or 'bent', which entered medical Latin as ankylosis before passing into English medical vocabulary in the 18th century. The underlying Indo-European root, meaning 'to bend', also produced the English words anchor and angle, making them distant cousins of this clinical term. In English, the verb ankylose and its participle forms developed alongside the noun ankylosis to describe joints that have stiffened into fusion.
Related word forms
How ankylosed is actually used
A technical term used chiefly in medicine, especially orthopaedics and rheumatology. It appears most often as the adjective form ('an ankylosed joint') or past participle ('the joint became ankylosed'). Rare outside clinical writing.
Easily confused with ankylosed
Ossified describes tissue that has hardened into bone-like material generally, whereas ankylosed specifically refers to a joint that has fused and lost its ability to move.