Tenosynovitis of wrists

Extensor tendons, running through the wrist to the fingers, have a projective sheath, called synovium, around them. Tenosynovitis is inflammation of the tendon or synovium. Among the forms of tenosynovitis of the wrist, De Quervain’s tenosynovitis, located on the side of the thumb, is the most common one. De Quervain’s tenosynovitis.