Can you still bend all your fingers normally after injuring your hand? Hand tendon injuries disrupt the intricate pulley system that controls finger movement. They occur when the fibrous cords connecting muscles to bones tear, stretch, or become inflamed. These injuries affect two primary tendon groups:
- Flexor tendons: the tendons on the palm side of your hand that allow you to bend your fingers
- Extensor tendons: the tendons on the back of your hand that allow you to straighten your fingers
The severity ranges from microscopic tears causing inflammation to complete ruptures that may require surgical repair. Recovery times vary from weeks for minor strains to months for surgical cases.
Understanding Hand Tendon Anatomy
Your hand contains multiple tendons working in coordination to produce movement. Flexor tendons (the tendons that help you bend your fingers) run from forearm muscles through the carpal tunnel (a narrow passageway in your wrist) and along each finger. They are held in place by pulleys that prevent bowstringing during finger flexion. Each finger has two flexor tendons—the flexor digitorum superficialis (FDS), which bends the middle joint, and the flexor digitorum profundus (FDP), which controls the fingertip joint.
Extensor tendons (the tendons that help you straighten your fingers) form a network on the hand’s dorsal surface (the back of your hand). The extensor digitorum communis splits into four tendons serving each finger. The thumb operates through its own tendon system, including the extensor pollicis longus and brevis, plus the abductor pollicis longus. These tendons glide through six dorsal compartments at the wrist. They are held in place by the extensor retinaculum (a band of tissue that holds the tendons in position).
The tendon sheath (a protective covering) surrounding each tendon produces synovial fluid (a lubricant) to enable smooth gliding. When injured, this sheath can become inflamed, leading to conditions such as trigger finger (a finger that gets stuck in a bent position) or De Quervain’s tenosynovitis (painful inflammation of tendons near the thumb). Blood supply to tendons remains limited compared to other tissues, which is why tendon injuries often heal more slowly than muscle or skin wounds.
Types of Tendon Injuries
Mallet Finger
Mallet finger occurs when the extensor tendon tears at its attachment point on the tip of your finger. The extensor tendon is the tissue that helps straighten your finger. This injury causes the fingertip to droop. The injury typically results from a direct blow to an extended finger. The joint closest to the fingertip remains bent. You cannot actively straighten it yourself, though someone else can gently straighten it for you.
Jersey Finger
Jersey finger represents an avulsion of the FDP tendon from its attachment on the fingertip bone. An avulsion is a tearing away of tissue. The injury is named after the mechanism of grabbing a jersey during sports. The ring finger is commonly affected due to its anatomical positioning. The tendon can retract into the palm. Retract means to pull back. How far it pulls back may determine the urgency of surgery. Tendons that have retracted all the way to the palm may require repair within a short timeframe before permanent tightening develops.
Boutonniere Deformity
This injury involves disruption of the central slip of the extensor tendon over the middle joint of your finger. The central slip is the middle part of the tissue that straightens your finger. The disruption causes the tendon’s sidebands to shift downward. The characteristic deformity develops over several weeks. The middle joint bends whilst the fingertip joint hyperextends. Hyperextension means it bends backwards too far. Early recognition can be challenging, as the deformity may not appear immediately after injury.
Trigger Finger (Stenosing Tenosynovitis)
Trigger finger develops when the flexor tendon becomes nodular, or the surrounding pulley structure thickens. The flexor tendon is the tissue that helps bend your finger. Nodular means it develops lumps. These changes create a size mismatch. The tendon catches during finger bending. It may require force to straighten, producing the characteristic triggering or locking sensation. The condition progresses through multiple stages:
- Pain without triggering
- Active triggering
- Triggering that may require you to straighten the finger with your other hand manually
- Fixed the bending that won’t straighten
If you’re looking for more information, you can consult a trigger finger specialist in Singapore.
De Quervain’s Tenosynovitis
This condition affects the first dorsal compartment, which contains two specific thumb tendons. These are the abductor pollicis longus and extensor pollicis brevis. Repetitive thumb movements cause thickening of the tissue covering this compartment. This restricts how smoothly the tendons can glide. New mothers frequently develop this condition from repetitive lifting motions. This has earned it the nickname “mother’s thumb.”
Recognising Symptoms
Acute tendon injuries present with immediate functional loss specific to the affected tendon. Complete flexor tendon ruptures (tears in the tendons that bend your fingers) eliminate active finger bending while maintaining passive motion (someone else can still bend your finger for you, but you can’t do it yourself). The affected finger rests in an abnormal position. It extends (straightens) when flexors rupture or flexes (bends) when extensors tear. Partial tears maintain some active motion but with significant weakness and pain during resistance testing.
Pain patterns vary by injury type and location. Acute ruptures often cause less pain than partial tears, as complete disruption eliminates tension on damaged fibres. Inflammatory conditions like tenosynovitis (inflammation of the tendon sheath, the protective covering around the tendon) produce aching pain that worsens with movement. Morning stiffness lasting over 30 minutes frequently accompanies this pain. Crepitus (a grinding or crackling sensation) during tendon movement may indicate sheath inflammation or adhesion formation (when scar tissue causes structures to stick together).
Swelling patterns can provide diagnostic clues about injury location and severity. Localised swelling directly over the injury site suggests a partial tear or strain. Diffuse swelling (swelling spread throughout a larger area) indicates more extensive damage or developing infection. Absence of swelling doesn’t exclude significant injury. Complete tendon ruptures in the digit may show minimal swelling if the tendon retracts proximally (pulls back toward the hand or wrist).
Visual deformities develop based on which tendons fail. Swan neck deformity (when the middle joint of your finger bends backwards whilst the fingertip bends downward) suggests volar plate (a ligament on the palm side of the finger joint) or FDS (flexor digitorum superficialis, one of the finger-bending tendons) injury. Claw deformity (when the knuckle joint extends backwards whilst the finger joints bend forward) may indicate intrinsic muscle dysfunction (problems with the small muscles within the hand). These deformities may appear immediately or develop gradually over weeks as secondary changes occur.
Immediate Care Guidelines
Apply the RICE protocol (Rest, Ice, Compression, and Elevation) after a suspected tendon injury. Modify positioning based on the affected tendon.
For suspected flexor tendon injuries (tendons that help bend your fingers), splint the hand with the wrist in slight flexion and fingers slightly bent to reduce tension on damaged structures. Extensor injuries (tendons that help straighten your fingers) require wrist extension with MCPs in moderate flexion to prevent further retraction.
Ice application can help reduce inflammation and pain, but requires careful monitoring to prevent cold injury. Apply ice packs for brief intervals every few hours during the first couple of days. Always place a barrier between ice and skin. Compression using elastic bandaging helps control swelling, but it must allow adequate circulation. Fingertips should remain pink with prompt capillary refill (the pink colour returns quickly when you press and release the fingertip).
Elevation above heart level can help reduce swelling accumulation and support venous drainage (helps fluid drain away from the injured area). Support the entire arm, not just the hand, to prevent secondary strain on the shoulder and elbow structures. During sleep, prop the affected hand on pillows. Ensure the elbow remains supported to prevent nerve compression.
Remove all jewellery promptly. Swelling can make rings constrictive, potentially requiring emergency removal. Document the following information:
- The mechanism of injury (how the injury happened)
- Time of onset
- Initial functional status (what movements you could or couldn’t do right after the injury)
Diagnostic Process
Clinical examination begins with observation of the resting hand posture and comparison of both hands for asymmetry. The normal cascade shows progressive finger flexion from index to small finger. Disruption of this cascade suggests tendon injury. Individual tendon testing isolates each tendon’s function: FDS testing requires holding other fingers extended. At the same time, the patient flexes the PIP joint (the middle joint of the finger), while FDP testing involves stabilising the PIP joint and requesting DIP flexion (bending the fingertip joint).
The Finkelstein test for De Quervain’s (a painful condition affecting tendons at the base of the thumb) involves ulnar deviation of the wrist (tilting the hand towards the little finger side) with the thumb grasped in the palm. Sharp pain in the first dorsal compartment may indicate a diagnosis. Elson’s test identifies boutonniere injuries (a particular type of finger deformity caused by tendon damage) by having the patient extend the PIP joint against resistance. In contrast, the finger is flexed over the edge of a table.
Ultrasound imaging offers visualisation of tendon movement (allowing the doctor to see how tendons move in real-time). It can identify partial tears, complete ruptures, and adhesions (where the tendon becomes stuck to surrounding tissue). The examination can demonstrate the distance of tendon retraction (how far a torn tendon has pulled back) and identify interposed tissue that might prevent primary repair. Power Doppler (a type of ultrasound that shows blood flow) shows increased vascularity in inflammatory conditions, helping to distinguish tenosynovitis (inflammation of the tendon sheath) from mechanical triggering.
MRI provides detailed soft tissue imaging when ultrasound results remain inconclusive or when multiple structures require evaluation. T2-weighted sequences (a type of MRI scan) highlight fluid accumulation around inflamed tendons, while T1 sequences (another type of MRI scan) demonstrate tendon continuity (whether the tendon remains intact). Contrast enhancement (when a dye is used) can help identify an infection or a tumour when suspected.
Treatment Approaches
Conservative Management
Minor strains and partial tears involving less than a quarter of the tendon width respond well to conservative treatment (non-surgical approaches). Controlled motion protocols prevent adhesion formation (scar tissue that restricts movement) while protecting healing tissue. The Saint John protocol for flexor tendon strains combines active extension with passive flexion. This maintains tendon gliding without excessive stress.
Anti-inflammatory medications can help reduce pain and swelling during the acute phase. However, they should be limited to a short period to avoid impeding the natural healing cascade. Topical NSAIDs (non-steroidal anti-inflammatory drugs, such as ibuprofen gel) provide localised relief with fewer systemic effects. Paracetamol offers pain relief without anti-inflammatory effects when NSAIDs are contraindicated.
Splinting Protocols
Mallet finger requires continuous DIP extension splinting (a support that keeps the fingertip straight) for an extended period, followed by night splinting for additional weeks. The splint must maintain the DIP joint in slight hyperextension while allowing PIP motion. Any disruption in splinting during the initial period restarts the healing timeline.
Trigger finger splinting blocks MCP flexion beyond a small degree. This prevents the tendon from catching under the A1 pulley (a band of tissue that holds the tendon close to the bone). Night splinting can be a method for managing symptoms that occur primarily upon waking. Boutonniere injuries need PIP extension splinting while encouraging DIP flexion exercises to prevent lateral band adhesions.
Surgical Interventions
Complete tendon ruptures and injuries involving more than half of the tendon width typically require surgical repair. Zone II flexor tendon injuries occur between the A1 pulley and FDS insertion. These injuries require careful surgical technique to restore the pulley system. Current repair techniques use core sutures (internal stitches) supplemented by epitendinous sutures (surface stitches). This can achieve sufficient strength for early protected motion.
Chronic injuries presenting beyond the acute repair window may require tendon grafting (using tissue from another area) or transfer procedures (redirecting a different tendon to restore function). The palmaris longus serves as a common graft donor in many individuals. Tendon transfers redistribute remaining function, such as transferring the extensor indicis proprius to restore thumb extension after extensor pollicis longus rupture.
Rehabilitation Timeline
Early mobilisation protocols beginning within hours after repair can help reduce adhesion formation (scar tissue that can limit movement). The modified Kleinert protocol combines passive flexion (gentle bending of the finger using rubber bands) via rubber bands with active extension (straightening the finger using your own muscles). This approach protects the repair while maintaining tendon gliding (the smooth sliding movement of the tendon). Patient compliance with the splinting and exercise regimen affects success.
The initial weeks focus on protected motion within the splint, with specific exercises performed several times daily. Scar management begins early using silicone gel sheets and gentle massage perpendicular to the incision. Oedema control (managing swelling) continues through compression garments and elevation between exercise sessions.
The following weeks transition to active motion without resistance, gradually increasing the demands on the range of motion. Tendon gliding exercises progress from isolated to composite movements (from moving one joint at a time to moving multiple joints together). Joint blocking exercises can help prevent adhesions at specific joints while protecting the repair site. Light functional activities (such as writing or typing) may begin if motion milestones are met.
Later weeks introduce progressive strengthening, starting with isometric exercises (muscle contractions without movement) before advancing to isotonic resistance (exercises where muscles shorten and lengthen against resistance). Grip strength typically improves by this stage. Work simulation activities prepare for return to occupation, with modifications based on job demands.
Preparation Steps
Maintain hand flexibility with daily range-of-motion exercises, especially if you perform repetitive hand activities. Perform tendon gliding exercises:
- Make a straight fist
- Hook fist
- Full fist
- Tabletop position
Hold each for several seconds. These exercises support tendon health and can help identify developing restrictions early.
Modify workstation ergonomics to reduce tendon stress during computer use or manual tasks. Position keyboards at elbow height with wrists neutral. Use ergonomic mouse designs that maintain natural hand positioning. Take stretch breaks regularly during repetitive activities. Tool modifications, such as enlarged grips, can reduce the force required to grip, thereby decreasing tendon strain.
Strengthen the entire kinetic chain from shoulder to fingertips, as weakness in the shoulder and upper arm can increase stress on the tendons in your hands and wrists. Eccentric strengthening exercises (exercises where you slowly lengthen a muscle under tension) may be suitable for preventing tendon problems. Use therapy putty or resistance bands for progressive loading. Always stop before fatigue compromises form.
Recognise early warning signs of tendon stress:
- Morning stiffness
- Aching after activity
- Catching sensations during movement (such as a finger briefly locking or popping when you try to straighten it)
Address these symptoms promptly through activity modification and appropriate treatment rather than working through pain.
Learn appropriate sports techniques when participating in activities with a risk of hand injury. Appropriate catching technique in ball sports, appropriate racquet grip size in tennis, and correct punching form in martial arts can all help reduce the risk of tendon injury.
When to Seek Professional Help
- Complete inability to bend or straighten any finger joint
- Finger resting in an abnormal position compared to other fingers
- Pain with attempted movement or at rest
- Visible tendon (the tissue that connects muscle to bone) protruding through a wound
- Catching or locking that prevents normal finger movement
- Swelling is increasing despite initial care measures
- Numbness or tingling accompanying the injury
- Signs of infection: increasing redness, warmth, or drainage (fluid coming from the wound)
- Pain persists beyond several days without improvement
- Weakness preventing regular grip or pinch activities
- Morning stiffness lasting more than a brief period
- Previous tendon injury with new symptoms developing
Commonly Asked Questions
Can partially torn tendons heal without surgery?
Partial tears involving less than a quarter to half of the tendon width can often heal with appropriate splinting and therapy. The tendon requires protection during healing through specific positioning that reduces tension (the pulling force) across the injury site. Progressive loading (gradually increasing the stress placed on the tendon) during supervised therapy supports healing. It also helps prevent adhesion formation (scar tissue that sticks tissues together), which limits motion.
How long before returning to sports after tendon repair?
Return to sports typically occurs at several months for non-contact activities and longer for contact sports. The timeline depends on the specific tendon repaired, the surgical technique used, and sport-specific demands. Athletes must demonstrate a full range of motion and sufficient strength (typically comparable to the uninjured side). They must also complete sport-specific movements without compensation (using other muscles or joints to make up for weakness) before clearance. A healthcare professional will set targets based on your specific injury, sport, and recovery progress.
Why do tendon injuries take longer to heal than other injuries?
Tendons have a limited blood supply compared to muscles or skin. They rely primarily on synovial fluid (the lubricating fluid in joints) for nutrition. This limited blood flow slows the delivery of healing cells and the removal of inflammatory debris (waste products from the healing process). The healing process must also restore the tendon’s precise collagen fibre alignment to regain tensile strength (the ability to withstand pulling forces). This requires careful remodelling over months.
What distinguishes trigger finger from other tendon problems?
Trigger finger specifically involves catching or locking during finger flexion (bending). This is caused by a size mismatch between the flexor tendon (the tendon that bends the finger) and the A1 pulley (a ring-shaped structure that holds the tendon close to the bone). The condition produces a palpable nodule (a bump you can feel) in the tendon. It often responds to corticosteroid injection (a steroid medication injected to reduce inflammation). Other tendinopathies (tendon conditions) cause pain and weakness without the mechanical catching characteristic of triggering.
Can old tendon injuries cause problems years later?
Previous tendon injuries may lead to chronic stiffness, weakness, or susceptibility to re-injury if incompletely rehabilitated. Scar tissue formation can restrict tendon gliding (the smooth sliding movement of the tendon). Incomplete healing may leave areas of weakness prone to re-rupture (tearing again). Secondary problems like joint contractures (permanent joint stiffness) or compensatory movement patterns (using your body differently to work around the injury) may develop. These issues require thorough evaluation and treatment.
Experiencing Hand, Wrist or Upper Limb Pain?
Get a Personalised Treatment Plan
Find relief with our specialist hand surgeon.
Make An EnquiryConclusion
Hand tendon injuries demand accurate diagnosis and timely intervention to preserve function. Complete tendon ruptures require surgical repair, while partial tears may respond to conservative treatment with proper splinting and rehabilitation. Early recognition of warning signs like finger catching, positional deformities, or persistent weakness prevents complications and optimises recovery outcomes.
If you’re experiencing finger catching, inability to bend or straighten your fingers, or persistent hand pain following an injury, consult an orthopaedic hand surgeon to evaluate your specific tendon injury pattern and determine appropriate treatment options.
