Our hands have such precision motor skills because each individual digit can move freely through a full range of motion. If this motoring skill is hampered even in a single digit it can result in a considerable loss of normal function. Trigger finger is such a bone and joint condition which hampers your finger’s flexion and extension abilities making it difficult to perform even simple daily chores without pain. The affected digit gets locked in a curled up position when bent towards the palm and frees with a pop, a mechanism from which the condition’s name is derived.
What is trigger finger?
Our fingers achieve this excellent dexterity through a complicated mechanism which involves pulley like structures along each digit of the hand. This pulley mechanism is dependent on the flexor tendon sheath for smooth gliding movement in normal condition. For a cause yet unknown, the flexor tendon sheath present in the digits thickens making the movement through the pulleys difficult. The tendon gets stuck in the pulley when a flexion (curling movement of the digit) is attempted. This curled up position can be a permanent deformity or the finger might snap back into normal position through a forced extension.
Trigger finger is caused by the inflammation of the tendon sheath which hampers the gliding mechanism in the digit pulleys but what triggers this inflammation is still unknown. The most commonly known facts about trigger finger are that it is commonly observed in the 3rd or 4th digit and they are more common in women than men. There are strong chances that patients suffering from rheumatoid arthritis and diabetes. Another widely accepted theory is that of repetitive trauma to a particular digit. Read more