Tendon Injury in Hand Treatment | Expert Care in Tarzana & Los Angeles

A finger that suddenly will not bend or straighten after a cut, sports injury, or accident deserves more attention than the size of the injury might suggest. A damaged tendon can interfere with gripping, typing, lifting, driving, exercise, and many of the daily tasks that depend on normal hand movement.

The right tendon injury in hand treatment starts with identifying exactly which structure was injured. Some tendon injuries may respond to splinting and hand therapy. Others may need surgical tendon repair. At Foundation Hand Surgery Institute, our board-certified orthopedic surgeons evaluate hand and upper extremity injuries and develop treatment plans around the injury, your daily responsibilities, and your recovery goals.

What You'll Learn From This Article

• How flexor and extensor tendons move your fingers and thumb

• Common causes of tendon injuries, including cuts and sports injuries

• Signs that may point to a flexor or extensor tendon problem

• How a hand surgeon examines a suspected tendon injury

• When treatment may involve a splint, hand therapy, or tendon repair

• What to expect during recovery and return to work or sports

• When it makes sense to see a hand specialist in Tarzana or Los Angeles

Understanding the type of tendon involved is the first step toward making sense of your symptoms and treatment options.

What Is a Tendon Injury in the Hand?

Tendons are strong bands of connective tissue that connect muscles to bone. In the hand, they transfer force from muscles in the forearm so you can bend and straighten your fingers and thumb.

Two major tendon systems control much of this movement.

Flexor Tendons

Flexor tendons travel along the palm side of the wrist, hand, and fingers. When the muscles connected to these tendons contract, they pull the fingers inward and help create a grip.

Several flexor tendons pass through protective tendon sheaths and pulley structures that keep them close to the bones as the fingers move.

Extensor Tendons

Extensor tendons travel mainly across the back of the hand and fingers. They help straighten the fingers and thumb.

A flexor tendon injury may make bending difficult or impossible. An extensor tendon injury may interfere with your ability to straighten a finger.

The exact location of the injury matters because different tendons, joints, and surrounding structures can be affected. Once you understand which movement has changed, the mechanism of injury can provide another important clue.

Common Types and Causes of Hand Tendon Injuries

Tendon injuries can happen with an open wound or beneath intact skin. Knowing how the injury occurred helps a hand surgeon determine which structures may need closer examination.

Cuts and Flexor Tendon Lacerations

Cuts from glass, knives, tools, machinery, or other sharp objects can damage a flexor tendon, particularly when the laceration is on the palm side of the hand or finger.

The tendon may be partially cut or completely divided. Because nerves and blood vessels run close to the flexor tendons, a deeper laceration may affect more than one structure.

A small skin wound does not always mean the underlying injury is minor.

The NCBI review describes sharp injuries, workplace accidents, and sports trauma as recognized causes of flexor tendon damage. It also notes that symptoms can include loss of active fer flexion, painful flexion, reduced sensation, or weakness.

Sports Injuries and Tendon Ruptures

A tendon can also rupture or pull away from the bone without a cut.

One example is jersey finger, which affects the flexor tendon that bends the fingertip. It often happens when a bent finger is forcefully straightened, such as when an athlete grabs another player's clothing, and the finger gets pulled away.

Mallet finger affects the extensor mechanism at the fingertip. A direct blow to the fingertip can force the joint into flexion, leaving the person unable to fully straighten the tip.

Tendon Damage Related to Disease or Wear

Some tendon ruptures occur in already weakened tissue. Rheumatoid arthritis, prior injuries, and long-term tendon degeneration may contribute in certain cases.

The cause matters because a clean laceration, a sports-related avulsion, and a degenerative rupture may require different treatment strategies.

That difference matters most when looking at the symptoms that appear after an injury.

Signs of a Flexor or Extensor Tendon Injury

A tendon injury often changes how you move actively. You may still be able to move the finger with your other hand, but you cannot produce the same movement using the injured finger itself.

Signs of a Flexor Tendon Injury

Possible signs include:

• Difficulty bending one or more finger joints

• Inability to bend the fingertip

• Pain when trying to bend a finger

• Weakness after a palm side laceration

• A finger resting differently from neighboring fingers

• Loss of movement after a sports injury

• Numbness if a nearby nerve was also damaged

A complete flexor tendon injury may cause a clear loss of active bending. With a partial injury, movement may still be possible but painful.

Signs of an Extensor Tendon Injury

An extensor tendon injury may make it difficult to straighten your finger.

With mallet finger, for example, the fingertip may remain bent even when you try to straighten it. Other extensor tendon injuries can affect different finger joints depending on the location of the damage.

A sudden inability to bend or straighten a finger after trauma should be evaluated, especially when there is a deep cut, numbness, significant bleeding, unusual finger color, or concern about circulation.

These symptoms do not confirm a tendon injury on their own. A focused examination is needed to determine what was actually damaged.

That examination looks at much more than the visible wound.

How a Hand Surgeon Diagnoses a Tendon Injury

A hand surgeon will usually start by asking how the injury happened and examining the affected finger's position, movement, sensation, and circulation.

Checking Finger and Thumb Movement

Your surgeon may ask about:

• When the injury happened

• How your hand or finger was positioned

• Whether a sharp object or sudden force caused the injury

• Your dominant hand

• Changes in movement or sensation

• Your occupation, sport, or usual activities

• Any treatment you have already received

The physical examination may include testing individual flexor or extensor tendons. The surgeon may also look at wound depth, finger position, active movement, sensation, capillary refill, and other signs of blood flow.

This is particularly important after a laceration because a tendon, nerve, and blood vessel can be injured in the same area.

When an X-ray or Other Imaging May Help

An X-ray does not usually show a tendon tear directly. It can still provide useful information by identifying a fracture, an avulsion fragment, or a retained foreign object.

In selected cases, ultrasound may help when the examination does not clearly show whether a tendon remains intact or when a partial laceration is suspected.

Imaging is only part of the assessment. The injury mechanism and physical examination often provide much of the information needed to plan the next step.

Once the extent of the injury is clearer, treatment can match the specific tendon and level of damage.

Tendon Injury in Hand Treatment Options

No single treatment fits every tendon injury. The appropriate approach depends on which tendon was damaged, whether the injury is partial or complete, its location, how long ago it occurred, and whether other structures were injured.

Treatment	When It May Be Considered	What It Involves
Splinting	Certain closed tendon injuries, including some extensor injuries	Holds the finger in a specific position while the tendon heals
Hand therapy	Conservative treatment or recovery after repair	Guided movement and exercises designed around the healing tendon
Tendon repair	Many complete lacerations or significant tendon disruptions	Surgery to reconnect or reattach the damaged tendon
Tendon reconstruction	Some delayed or complex injuries	May involve grafting or tendon transfer when direct repair is not appropriate

Splinting and Conservative Treatment

Not every tendon injury requires hand surgery.

Some closed extensor tendon injuries, including certain cases of mallet finger, may be treated with a splint. The splint keeps the affected joint in the position needed for healing.

How the splint fits, how consistently it is worn, and how long treatment continues can matter. Patients should follow their clinician's instructions rather than changing the splinting schedule on their own.

Hand therapy may also be part of a nonsurgical treatment plan.

When Tendon Repair May Be Needed

A complete tendon laceration often requires surgical repair.

During tendon repair, the surgeon reconnects the damaged tendon or reattaches it when the tendon has pulled away from the bone. A successful repair must provide enough strength for healing while also allowing the tendon to glide through the surrounding tissues as rehabilitation progresses.

A review of flexor tendon injuries and treatment discusses how repair technique and rehabilitation work together because stiffness and adhesions can limit tendon gliding after injury.

Other injuries can complicate treatment. A laceration may involve a nerve or blood vessel. A sports injury may include a small fracture. Some patients may have multiple tendons involved.

Why Treatment Timing Matters

Not every tendon injury requires immediate surgery, but some need prompt assessment.

After a complete tendon injury, the tendon can retract, and scar tissue can develop. Over time, direct repair may become more difficult in some cases.

Wound condition also affects timing. Contamination, infection, tissue damage, and associated injuries may influence when a surgeon recommends repair.

No safe universal deadline applies to every injury. A hand surgeon can determine the right timing based on the specific tendon and the hand's condition.

Treatment is only the beginning. For many tendon injuries, rehabilitation has a major role in determining how the hand functions during recovery.

What Recovery After Tendon Repair Can Involve

Patients often want to know when they can type, drive, lift, return to work, or get back to sports. The answer depends on the injury and how healing progresses.

Protecting the Tendon While Restoring Movement

A repaired tendon needs time to heal. At the same time, keeping a finger still for too long can contribute to stiffness and scar tissue.

This creates a careful balance between protecting the repair and restoring controlled movement.

A review of hand tendon injuries describes tendon healing as a gradual biological process and highlights the importance of rehabilitation after repair.

Your surgeon and therapist may use a specific protocol based on the tendon involved, the repair, and other injuries.

The Role of Hand Therapy

Hand therapy may include:

• A protective or custom splint

• Controlled finger movement

• Range of motion exercises

• Scar management

• Progressive strengthening

• Guidance for work and daily tasks

Treatment is usually adjusted as healing progresses.

Following activity restrictions is important. Advancing too quickly can place unnecessary stress on a repair, while too little movement can contribute to stiffness or adhesions.

Returning to Work, Exercise, and Sports

Recovery needs differ considerably between patients.

Someone who spends most of the day typing may face different demands than a nurse, tradesperson, musician, caregiver, athlete, or small business owner who regularly lifts or grips equipment.

The timing of return to work or sports can depend on:

• Which tendon was injured

• Injury location and severity

• Whether other structures were damaged

• Type of surgical repair

• Finger motion and strength

• Progress during hand therapy

• Physical demands of your job

• Type of sport or exercise

Your surgeon and hand therapist can help determine when specific activities are appropriate based on how your hand is healing.

Even with careful treatment, tendon injuries can still present challenges worth understanding before recovery begins.

Possible Challenges After a Hand Tendon Injury

Treatment aims to restore as much useful motion and function as possible, but recovery varies.

One common concern is scar tissue around the tendon. This can form adhesions that restrict normal gliding and make the finger feel stiff.

Other possible problems may include:

• Reduced range of motion

• Persistent weakness

• Finger stiffness

• Tendon adhesions

• Tendon rupture or repair failure

• Difficulty regaining full active movement

An injury involving nerves, blood vessels, joints, or bones may also require a more involved recovery.

No treatment can guarantee completely normal movement after every tendon injury. The outcome depends on the injury type and location, associated damage, timing of care, repair quality, rehabilitation, and individual healing.

Realistic expectations make it easier to understand why follow-up visits and hand therapy may remain important long after the original wound has healed.

Knowing when to seek focused care can also prevent unnecessary uncertainty about what the injury requires.

When to See a Hand Specialist for a Suspected Tendon Injury

A sore finger after a minor bump does not always require specialty care. A significant change in active movement deserves closer attention.

Consider having your hand evaluated if:

• You cannot bend a finger after a palm-side cut

• You cannot fully straighten your finger after an injury

• A deep laceration changed the way your finger moves

• You have numbness after a cut

• Your fingertip will not bend after a sports injury

• You continue to have weakness or painful movement

• You notice unusual color or circulation changes

• Symptoms have not improved as expected

• You want a second opinion about recommended treatment or hand surgery

Blood vessels, joints, and small bones in a compact space. Focused hand expertise can help determine which structures are involved and what type of care makes sense.

des dedicated hand and upper extremity care for patients in Tarzana, the San Fernando Valley, West Valley, West LA, and surrounding Los Angeles communities. Our two board-certified orthopedic surgeons evaluate acute injuries, chronic hand problems, and patients seeking a second opinion.

Our goal is to give you a clear explanation of your injury, realistic treatment options, and a plan that considers your work, family responsibilities, hobbies, and activity goals.

After the initial treatment discussion, many patients still have a few practical questions.

Frequently Asked Questions About Hand Tendon Injuries

1. Can a Cut Tendon in the Hand Heal Without Surgery?

Some tendon injuries can be treated without surgery, but others require repair.

The decision depends on which tendon was injured, whether the damage is partial or complete, the injury's location, and how much function remains. Certain extensor tendon injuries may respond to splinting. Complete flexor tendon lacerations often require surgical repair.

A hand surgeon can assess tendon function and explain which approach is appropriate for your injury.

2. How Do I Know if I Have a Flexor Tendon Injury?

Difficulty bending a finger after a palm-side laceration can suggest a flexor tendon problem. Other signs may include painful bending, weakness, an unusual resting finger position, or an inability to bend the fingertip.

Numbness after a cut may point to an associated nerve injury.

These signs can occur with different hand injuries, so an examination is needed rather than relying on symptoms alone.

3. What Is the Difference Between Mallet Finger and Jersey Finger?

Mallet finger affects the extensor mechanism at the fingertip. It usually causes difficulty straightening the fingertip joint.

Jersey finger involves the flexor tendon that bends the fingertip. It typically occurs when a bent finger is forcefully straightened and may leave the person unable to actively bend the fingertip.

Both can happen during sports, but they involve different tendons and may require different treatment.

4. Is an X-ray Part of Tendon Injury in Hand Treatment?

An X-ray may help, but it usually does not show the tendon itself.

Your surgeon may order one to look for a fracture, bone fragment, or foreign object associated with the injury. In certain situations, ultrasound may provide additional information about tendon continuity.

The examination usually determines whether any imaging tests are necessary.

5. How Long Does Recovery Take After Hand Tendon Repair?

There is no single recovery timeline for tendon repair.

Healing depends on the tendon involved, the severity and location of the injury, other damaged structures, the repair performed, your rehabilitation program, and the demands you plan to place on the hand.

Hand therapy may continue as motion, tendon gliding, and strength improve. Your surgeon and therapist can give you more specific guidance as they monitor your progress.

Understanding those variables can make the next step feel more concrete, especially when an injury is already interfering with work or normal daily use.

Get a Clear Treatment Plan for Your Hand Injury

Losing normal finger movement can quickly affect work, sports, household responsibilities, and independence. Finding the cause gives you a better basis for deciding what comes next.

Tendon injury in hand treatment may involve splinting, hand therapy, tendon repair, or a different surgical approach depending on the injury. The right plan starts with a careful examination and a clear discussion of your options.

If a hand injury has changed the way your finger or thumb bends or straightens, Foundation Hand Surgery Institute can evaluate the problem and discuss a personalized treatment plan. Our board-certified orthopedic surgeons provide focused hand and upper extremity care for patients in Tarzana and throughout the Los Angeles area.

Request an appointment to get your hand evaluated, discuss your treatment options, or seek a second opinion.