Tenosynovitis is the inflammation of the fluid-filled sheath (called the synovium) that surrounds a tendon, typically leading to joint pain, swelling, and stiffness. The sheath of the tendon becomes thinner which is caused by the reduced lubrication between tendon and its sheaths due to the excess rubbing movements. Some secondary factors that increase the risk of tenosynovitis is having improper skill and posture when moving the wrist. The 2 common types of tenosynovitis are De Quervain’s Tenosynovitis and Trigger Finger Tenosynovitis.
De Quervain’s Tenosynovitis:
De Quervain’s Tenosynovitis is a condition that affects the tendons in your wrist. Repeating a particular motion may irritate the sheath around the two tendons, causing thickening and swelling that restricts their movement. This condition affects tendons that abduct and extend the thumb necessary for dexterity and manipulation.
The exact cause of this type of tenosynovitis is unknown. However, any activity that requires repetitive hand or wrist movement can aggravate the condition – such as knitting, racket sports, lifting a baby, and walking a pet. Treatments for De Quervain’s Tenosynovitis include wearing a thumb splint to immobilize the thumb, preventing further abduction of the thumb.
Trigger Finger Tenosynovitis:
Trigger finger tenosynovitis is tenosynovitis of tendons that flex fingers. The cause of this condition occurs from repetitive and forceful flexing of fingers. As a result, one of the fingers gets stuck in the bent position due to the bulbous swelling that restricts finger flexion and may lock them in a fixed position. A bump, also known as a nodule, may occur from the inflammation of the tendon sheath. Trigger finger occurs mostly near metacarpophalangeal joints, middle and ring fingers of the dominant hand.
People whose work or hobbies require repetitive gripping actions are at higher risk of developing trigger finger tenosynovitis. Additionally, those with health problems such as rheumatoid arthritis and diabetes are at higher risk.