Trigger Finger Physiotherapy: Exercises & When Surgery

Understanding Trigger Finger (Stenosing Tenosynovitis)

Trigger finger, known clinically as stenosing tenosynovitis, is a common hand condition characterized by catching, clicking, or locking of a finger or thumb during flexion and extension. The condition affects the flexor tendons—specifically the Flexor Digitorum Superficialis (FDS) and Flexor Digitorum Profundus (FDP)—which glide through a series of protective sheaths and pulleys in the hand. Due to repetitive gripping, friction, or local micro-trauma, the tendon develops a localized nodule or the A1 pulley (located at the base of the finger in the palm) becomes thickened. This prevents the tendon from gliding smoothly, trapping the nodule outside the pulley and locking the finger in a bent position.

Rehabilitation focuses on reducing the size of the nodule and improving tendon glide. A structured program of hand physiotherapy and pain management is highly effective, helping to avoid invasive surgery in the majority of early-stage cases.

The Clinical Grading of Trigger Finger

To determine the appropriate treatment path, clinicians classify the severity of the condition into four distinct grades:

Clinical Grading and Treatment Protocol Table

| Grade | Clinical Presentation | Primary Treatment Approach | | :--- | :--- | :--- | | Grade I (Pre-triggering) | Pain, tenderness over A1 pulley; no locking | Activity modification, ice, gentle stretches | | Grade II (Active) | Catching/clicking; finger can be actively extended | MCP extension splinting, tendon gliding exercises | | Grade III (Passive) | Locking; finger requires passive extension by other hand | Splinting, corticosteroid injection, hand therapy | | Grade IV (Locked) | Finger is fixed in flexion; cannot be extended | Surgical A1 pulley release, followed by post-op rehab |

Conservative Physiotherapy Interventions

For Grades I, II, and responsive Grade III cases, conservative hand therapy is the first line of defense. The protocol consists of three main pillars:

1. Custom MCP Extension Splinting

Research supports the use of a custom extension splint that holds the metacarpophalangeal (MCP) joint of the affected finger at 0 degrees (straight) while leaving the proximal and distal interphalangeal (PIP and DIP) joints free to bend. Wearing this splint, especially at night, for 6 to 10 weeks restricts the flexor tendon nodule from gliding through the A1 pulley during sleep. This reduces overnight friction and inflammation, allowing the nodule to shrink.

2. Tendon Gliding Exercises

These exercises are designed to maximize the movement of the FDS and FDP tendons relative to the surrounding sheath, promoting joint mobility and preventing scar tissue accumulation. Perform these exercises slowly, 3 to 5 times daily, within a pain-free range:

• Straight Hand: Start with your hand completely open and fingers straight.
• Hook Fist: Bend only the tips of your fingers (DIP and PIP joints), keeping your knuckles (MCP joints) straight. Hold for 2 seconds.
• Tabletop Fist: Bend only your knuckles (MCP joints), keeping your fingers straight. Hold for 2 seconds.
• Straight Fist: Bend your knuckles and PIP joints, keeping the tips of your fingers straight. Hold for 2 seconds.
• Full Fist: Close your hand into a tight fist, bending all joints. Hold for 2 seconds.

3. Blocked Range of Motion Stretches

• PIP Joint Blocking: Hold the base of the affected finger stable with your other hand, just below the middle joint. Bend and straighten only the middle joint of the finger. Perform 10 repetitions.
• Passive Extension Stretch: Gently pull the affected finger back into extension until you feel a mild stretch in the palm. Hold for 15 seconds, and repeat 3 times.

When is Surgery Indicated?

If a patient presents with Grade IV triggering (where the finger is permanently locked in a bent position) or fails to show improvement after 6 to 12 weeks of splinting and hand therapy, more invasive interventions are considered.

• Corticosteroid Injections: A local cortisone injection into the tendon sheath can quickly reduce swelling. It provides long-term relief in approximately 50-80% of patients, but its success rate decreases in patients with diabetes or long-standing symptoms.
• Surgical A1 Pulley Release: If conservative care and 1 or 2 injections fail, surgery is indicated. This is a quick outpatient procedure performed under local anesthesia. The surgeon makes a small incision in the palm and cuts the A1 pulley, releasing the tight band and allowing the tendon to glide freely without catching.

Following surgery, immediate post-surgical rehabilitation is vital to manage scar tissue, prevent joint stiffness, and safely rebuild grip strength.