What does tenosynovitis mean?
Tenosynovitis is the medical term for inflammation of the synovial sheath surrounding a tendon. The sheath is a fluid-lined covering that helps a tendon glide smoothly over nearby bones and joints. When it becomes inflamed, it can cause pain, swelling, tenderness, stiffness, and difficulty moving the affected area. The condition may occur in the wrist, hand, ankle, foot, or other sites where tendons pass through sheaths. It can result from repetitive movement, injury, or conditions affecting the tendons and their surrounding tissues. De Quervain's tenosynovitis, affecting the thumb-side wrist, is a well-known form. The word is useful because it identifies a specific structure and condition rather than simply describing generic tendon pain, although patients and non-specialists often use tendonitis more loosely. Accurate terminology helps distinguish inflammation of a tendon from inflammation of its surrounding sheath.
nounInflammation of the synovial sheath surrounding a tendon, often causing pain, swelling, tenderness, and restricted movement.
- Inflammation of the synovial sheath surrounding a tendon.
"Her doctor diagnosed tenosynovitis in her wrist after repeated movements at work caused persistent pain and swelling."
"The scan confirmed tenosynovitis, explaining why she felt pain whenever she bent her wrist."
"A hand specialist explained that de Quervain's tenosynovitis affects the sheath around the tendons at the base of the thumb."
The standard plural of tenosynovitis is tenosynovitides, although the singular form is often retained when discussing cases of the same condition.
"The clinic treats patients with tenosynovitides involving the wrist and hand."
Tenosynovitis is a tendon problem with a twist: the pain and swelling often come from the slippery sheath around the tendon, not the tendon itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tenosynovitis come from?
The name is formed from Greek tenōn, meaning “tendon,” together with synovial sheath, referring to the sheath's fluid-filled lining, and the Greek suffix -itis, meaning “inflammation.” The related English words tendon and tendinous reflect the same Greek source, while synovial and synovitis belong to the related vocabulary describing sheaths and their lining. The compound follows the conventions of modern medical terminology.
How tenosynovitis is actually used
This is primarily a formal medical term. It is related to, but not synonymous with, tendinitis or tendonitis, which refer to inflammation within a tendon. In general usage, the distinction is often blurred.
Easily confused with tenosynovitis
Tendonitis refers to inflammation of a tendon itself, whereas tenosynovitis affects the synovial sheath that surrounds the tendon.