Trigger finger, otherwise called stenosing tenosynovitis, occurs when your finger(s) gets stuck in a bent position – as if squeezing a “trigger.” Trigger finger can occur in one or more fingers. The ring finger is often one of the fingers affected. When it involves the thumb, it is called trigger thumb. Your finger may bend or straighten with a snap — like a trigger being pulled and released.
In the hand, tendons and muscles must work together to flex and straighten your fingers. Tendons are fibrous cords that attach muscle to bone. Usually, tendons slide easily in their individual surrounding protective sheath, called a “tendon sheath”. The sheath keeps the tendons in place next to the bones of the finger, preventing “bowstringing” of the tendon. With trigger finger, the tendon sheath becomes irritated and inflamed. This interferes with the normal gliding motion of the tendon through the sheath. As a result, the tendon gets stuck. A nodule or bump may also form on the tendon, which makes gliding of the tendon through its sheath more difficult.
Risk factors include:
• Prolonged gripping – recreational or professional
• Medical problems: patients with diabetes or rheumatoid arthritis are at higher risk of developing trigger finger
• Sex - trigger finger is more common in women
• Previous carpal tunnel surgery, especially during the first six months after surgery
People whose work or hobbies require repetitive gripping action are at higher risk of developing trigger finger. The condition is also more common in women and in patients with diabetes.
Signs and symptoms of trigger finger may include the following:
• Finger stiffness, especially in the morning
• A bump (nodule) or tenderness at the base of the affected finger – this is a common early sign of triggering
• A popping or clicking sensation as you move your finger
• Finger catching or locking in a bent position, which suddenly pops straight or you can easily straighten voluntarily with your other hand
• Finger locked in a bent position, which you are unable to straighten
Trigger finger can affect any finger, including the thumb. More than one finger may be affected at a time, and both hands might be involved.
Your doctor can make the diagnosis based on your medical history and a physical exam. During the exam, your doctor will ask you to open and close your hand, checking for areas of pain, smoothness of motion and evidence of catching or locking. Your doctor will also feel the base of your finger at the palm to see if there is a lump present (nodule).
Conservative treatment may include:
• Rest. Avoid activities that require repetitive gripping, grasping or prolonged use of vibrating tools. If you can't avoid these activities, you may try padded gloves.
• Splint, especially at night to keep the finger extended for up to six weeks.
• Stretching exercises.
If conservative treatment is ineffective, or symptoms are severe, there are the following options:
• Steroid injection. Cortisone is injected into the tendon sheath under ultrasound guidance. This may reduce inflammation and allow the tendon to glide freely again. This is the most common treatment, and it’s effective two thirds of the time. For people with diabetes, steroid injections tend to be less effective.
• Percutaneous release. After numbing your palm, your doctor inserts a needle into the tissue around your affected tendon. Moving the needle and your finger helps break apart the constriction that blocks the tendon from moving smoothly. This procedure is usually done in the doctor's office or in an office procedure room.
• Surgery. The surgeon preforms a small incision (about 1-1.5cm) near the base of the affected finger and releases the constricted section of tendon sheath. This procedure is called A1 pulley release and is usually done in an operating room under local anesthetic. The patient remains fully awake during the procedure and can go home shortly after the procedure. You can expect to have a small dressing for a few days after the surgery
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