Tenosynovitis vs. Tendonitis — What's the Difference?

Tenosynovitis is the inflammation of the fluid-filled sheath (called the synovium) that surrounds a tendon, typically leading to joint pain, swelling, and stiffness. Tenosynovitis can be either infectious or noninfectious.

Inflammation of a tendon.

Inflammation of a tendon sheath.

Inflammation of a tendon

(pathology) An inflammation of the fluid-filled sheath (the synovium) that surrounds a tendon.

Inflammation of the synovial sheath of a tendon.

Inflammation of the sheath surrounding a tendon