Finger Flexor Tendon Rupture: Causes, Symptoms, and Treatment

A finger flexor tendon rupture is a serious injury that can make it difficult or impossible to bend a finger normally. Prompt evaluation by a hand specialist is important because complete ruptures often need surgery, and earlier treatment can improve the chance of restoring useful movement and strength. Our Orlando hand specialists can evaluate suspected tendon injuries.

What are finger flexor tendons?

Finger flexor tendons are strong cords that connect muscles in the forearm to the finger bones and allow you to bend your fingers. Each finger has two main flexor tendons: the flexor digitorum superficialis (FDS), which bends the middle finger joint, and the flexor digitorum profundus (FDP), which bends the fingertip.

Because these tendons travel through narrow spaces inside the hand and fingers, injuries can be complex and may require specialized treatment and rehabilitation.

What causes a finger flexor tendon rupture?

A flexor tendon can rupture when it is suddenly overstretched, cut, or exposed to more force than it can withstand. Sports injuries, deep cuts, falls, and forceful finger extension are common causes.

• Sports injuries: Activities such as football, wrestling, rugby, and rock climbing can place significant stress on the fingers. A “jersey finger” injury can rupture the FDP tendon.
• Cuts and lacerations: A deep wound to the finger or palm can cut a tendon even when the skin injury appears relatively small.
• Forced hyperextension: A finger suddenly bent backward can partially or completely tear a tendon.
• Tendon degeneration: Certain inflammatory conditions and previous hand surgery can weaken tendon tissue over time.

What are the symptoms of a flexor tendon rupture?

The most noticeable symptom is difficulty or inability to bend one or more finger joints. Pain, swelling, bruising, tenderness, and sometimes a popping sensation can also occur at the time of injury.

A complete FDP injury may prevent you from bending the fingertip, while an FDS injury can affect bending at the middle finger joint. Partial tears may still allow some movement, so the absence of complete loss of motion does not necessarily mean the tendon is intact.

How is a finger flexor tendon rupture diagnosed?

A hand specialist can often identify a flexor tendon injury through a physical examination and specific finger-bending tests. Imaging may be used when the injury is complex or the extent of tendon damage is unclear.

X-rays can identify associated fractures, while ultrasound or MRI may help evaluate tendon continuity, retraction, or partial tears. Prompt assessment is especially important when there is a sudden loss of finger movement.

Can a flexor tendon rupture heal without surgery?

Some partial tendon injuries may be treated without surgery, but complete flexor tendon ruptures commonly require surgical repair. Treatment depends on the severity and location of the tear, tendon retraction, and how much time has passed since the injury.

Non-surgical treatment may include splinting and carefully supervised hand therapy. Your surgeon will monitor healing and function to determine whether additional treatment is necessary.

When does a finger flexor tendon rupture need surgery?

Complete ruptures often need surgery to reconnect the tendon and restore finger movement. Treatment is generally more straightforward when the injury is evaluated and repaired promptly, before the tendon retracts or significant scarring develops.

Depending on the injury, the surgeon may perform a primary tendon repair. Delayed or complex injuries may require a tendon graft or staged reconstruction when the original tendon ends cannot be repaired directly.

What is recovery like after flexor tendon surgery?

Recovery usually takes several months and requires carefully supervised hand therapy. Surgery repairs the tendon, but rehabilitation is essential for restoring motion, strength, and useful hand function.

Early therapy may begin soon after surgery with controlled movement designed to reduce stiffness and scar-tissue formation. Activity typically progresses gradually from protected motion to active movement and eventually strengthening.

• 0–4 weeks: Protection, splinting, and controlled movement.
• 4–8 weeks: Progressive active motion under therapy guidance.
• 8–12 weeks: Gradual return to light functional hand use.
• 3–6 months: Progressive return toward full activity, depending on healing and strength.

What complications can occur after a flexor tendon rupture?

Possible complications include tendon re-rupture, stiffness, scar-tissue adhesions, infection, and reduced grip or finger strength. Following activity restrictions and attending therapy can help reduce the risk of problems during recovery.

Contact your surgical team if you develop worsening pain, significant swelling, redness, drainage, fever, or a sudden loss of finger movement.

When should I see a hand specialist for a tendon injury?

You should seek prompt evaluation if you cannot bend a finger normally after an injury, particularly after a deep cut, forceful finger extension, or sports injury. Early assessment can help determine whether the tendon is partially or completely damaged.

Orlando Hand Surgery Associates treats tendon injuries and other hand conditions, including injuries that require specialized reconstruction. If you suspect a flexor tendon rupture, request an appointment for an evaluation.

Frequently Asked Questions About Finger Flexor Tendon Ruptures