Trigger Finger

What Is Trigger Finger?

Trigger finger, sometimes called trigger thumb or stenosing tenosynovitis, occurs when the tendons that bend your fingers can't glide smoothly through the tunnel-like structures that hold them in place. These structures, called pulleys, work like the guides on a fishing rod, keeping the tendon close to the bone as your finger bends and straightens.

The flexor tendons that bend your fingers have a smooth lining called tenosynovium that allows them to glide effortlessly through the pulleys. When this system works properly, your fingers move freely. But if the tendon enlarges, the lining thickens, or the pulley itself becomes tight, the tendon can get stuck. This creates the catching, popping, or locking sensation that defines trigger finger.

When the tendon becomes tight within the pulley, the lining gets squeezed and reacts by swelling. The swelling creates more fluid, which increases pressure, which causes more friction. Over time, this cycle can make it progressively harder for the tendon to move back and forth.

Symptoms

Trigger finger often begins with mild discomfort at the base of the affected finger, right where it joins the palm. You might notice pain only when gripping or using your hand. At rest, the finger may feel fine. As the condition progresses, the pain can become more constant, even without activity.

The hallmark symptom is a mechanical catching, popping, or locking sensation when you try to bend or straighten the finger. Early on, this may be painless or only mildly uncomfortable. As the tendon and pulley interaction becomes tighter, the catching can become more pronounced and painful. Some people wake up with the finger locked in a bent position and have to use the other hand to straighten it.

You may also notice a small lump or tenderness at the base of the affected finger. This can be a nodule within the tendon itself or a fluid-filled cyst. Over time, if left untreated, trigger finger can lead to stiffness and loss of motion, both in bending and straightening the finger. The joint may become stuck in one position, and trying to force it can be painful.

Causes & Risk Factors

In most cases, the exact cause of trigger finger is unknown. It develops when the delicate balance between tendon size, lining thickness, and pulley diameter is disrupted. Any change in one of these structures can lead to friction and inflammation.

Certain medical conditions increase your risk. These include rheumatoid arthritis, gout, and diabetes. Repeated or forceful gripping can contribute, especially if your work or hobbies involve sustained hand use. However, many people develop trigger finger without any obvious cause or risk factor. It can affect anyone, though it's more common in women and in people between the ages of 40 and 60.

Diagnosis

Trigger finger is diagnosed based on your symptoms and a physical exam. Your hand surgeon will ask about when the catching or locking occurs, whether there's pain, and what makes it better or worse. During the exam, you'll be asked to bend and straighten your fingers while the surgeon feels for catching, nodules, or tenderness at the base of the finger.

Imaging tests like X-rays or MRI are rarely needed. The diagnosis is typically straightforward and based on what you experience and what the surgeon can feel and observe during the exam.

Treatment Options

The goal of treatment is to reduce swelling, eliminate the catching or locking, and restore full, painless finger movement. Early treatment is more likely to be successful, so it's best not to wait until the problem becomes severe.

Non-surgical options are often tried first, especially if symptoms are mild or have been present for a short time. A night splint can keep the finger straight during sleep, which helps prevent painful locking in the morning. Anti-inflammatory medications like ibuprofen or naproxen may reduce pain and swelling. Modifying activities that involve repetitive or forceful gripping can also help.

A corticosteroid injection into the area around the tendon and pulley is often very effective. The injection reduces inflammation and allows the tendon to glide more freely. This treatment works best when symptoms are caught early, though it can be tried at any stage. Some people experience lasting relief after one injection, while others may need a second or may eventually require surgery.

If non-surgical treatments don't provide relief, or if the finger is severely locked or stiff, surgery may be recommended. The procedure, called trigger finger release, involves opening the tight pulley so the tendon can glide freely again. It's a straightforward surgery that reliably resolves the catching and locking in most cases.

Surgery: What to Expect

Trigger finger release is performed as an outpatient procedure. The surgery is done under local anesthesia, with sedation available for select cases if needed. The procedure takes about 10 to 15 minutes. A small incision is made at the base of the affected finger, and the tight pulley is released. Once the pulley is opened, the tendon can glide freely, and the catching or locking is immediately resolved.

In some cases, if there's significant thickening of the tendon lining, it may be removed during the same procedure. If the tendon itself is enlarged, a portion may be trimmed to reduce bulk and improve gliding. The goal is to address all sources of the problem during one surgery so that you have the best possible outcome.

At the end of the procedure, you'll be asked to bend and straighten your finger several times to confirm that the catching is gone and that the tendon is moving smoothly. Your hand will be wrapped in a soft dressing, and you'll go home the same day.

Recovery

After surgery, you'll be encouraged to move your fingers right away to prevent stiffness. You'll receive a home exercise program that includes finger and wrist mobility exercises along with scar massage techniques. Most people can manage their recovery well with these home exercises, though formal hand therapy is available if needed.

Most people can return to light activities within a few days and resume normal activities within a few weeks. There may be mild tenderness at the incision site for several weeks, but this gradually improves. Full recovery, including resolution of any stiffness and return of full strength, can take up to a few months.

Complications are rare. The locking and catching almost always resolve after surgery. Occasionally, some stiffness may persist, especially if the finger was locked for a long time before treatment. Your surgeon will discuss what to expect based on the severity and duration of your symptoms.

When to See a Specialist

If your finger is catching, popping, or locking, especially if it's affecting your ability to work or perform daily tasks, it's worth getting evaluated. Early treatment is more effective and can help you avoid the stiffness and pain that come with chronic trigger finger. If your finger is stuck in a bent position and you can't straighten it, you should be seen promptly.

Dr. Lackey specializes in diagnosing and treating trigger finger and can help you determine the best treatment approach for your situation.