Carpal Tunnel Syndrome: Symptoms, Causes and Treatment

Carpal tunnel syndrome is the most common compression neuropathy, caused by compression of the median nerve as it passes through the carpal tunnel of the wrist. It affects 3-6% of the population, with higher prevalence in women (3:1) and in the 40-60 age group. It is now one of the most widespread computer work-related conditions. For more information, consult the guide on wrist and hand anatomy. For further reading, consult the guide on ulnar nerve neuropathy.

If diagnosed early, in most cases it responds well to conservative treatment without the need for surgical intervention.

Anatomy of the Carpal Tunnel

The carpal tunnel is a narrow canal formed by the carpal bones (floor and lateral walls) and the transverse carpal ligament (roof). It contains: the median nerve and 9 flexor tendons of the fingers.

Any condition that increases pressure inside the tunnel compresses the median nerve.

Causes

Occupational

• Computer work: prolonged use of mouse and keyboard with wrist in extension or deviation
• Associated epicondylitis: often coexists due to shared risk factors
• Manual work with repetitive movements, vibrations, prolonged gripping

Anatomical and Metabolic

• Pregnancy: fluid retention that increases pressure in the tunnel
• Menopause: hormonal changes
• Diabetes: associated neuropathy
• Hypothyroidism: myxedema
• Rheumatoid arthritis: synovitis of flexor tendons
• Obesity
• Previous wrist fractures

Biomechanical

• Prolonged wrist extension posture
• Cervical compression (double crush syndrome: nerve compression at two levels)

Symptoms

• Tingling and numbness: in the first 3 fingers and half of the 4th finger (median nerve territory). Initially nocturnal, then also diurnal
• Pain: in the wrist, hand, sometimes radiating to the forearm
• Grip weakness: difficulty grasping small objects, tendency to drop things
• Night awakening: the patient wakes up with a numb hand and must shake it to restore sensation (flick sign)
• Thenar eminence atrophy: in advanced cases, flattening of the muscle at the base of the thumb

Clinical Tests

• Phalen’s test: maximum wrist flexion for 60 seconds — positive if it reproduces symptoms
• Tinel’s sign: percussion on the carpal tunnel — positive if it causes tingling in the fingers
• Electromyography (EMG): confirms the diagnosis and quantifies severity

Classification

Conservative Treatment

Orthoses (Night Splint)

• Neutral position wrist splint to wear during the night
• Maintains the wrist in neutral position, reducing pressure in the tunnel
• Demonstrated efficacy: improvement in 60-70% of mild-moderate cases

Physiotherapy

• Neurodynamic techniques: mobilization of the median nerve along its entire course
• Manual therapy: carpal bone mobilization, flexor release
• Specific stretching: wrist flexors and extensors
• Cervical assessment: to exclude/treat double crush syndrome
• Low-level laser: biomodulating effect on the nerve
• Ultrasound: on the carpal tunnel region

Ergonomics

• Correct workstation
• Flat keyboard, wrist rest, ergonomic mouse
• Regular breaks with stretching

Injections

• Corticosteroids in the carpal tunnel: effective in the short-medium term (3-6 months). Can delay the need for surgery

Exercises

Neurodynamic Exercises (Median Nerve Mobilization)

Exercise 1: Median Nerve Gliding

Difficulty: Easy | Equipment: None | Duration: 3 minutes

Starting position:
Standing with erect posture, extend the affected arm laterally at shoulder height, elbow completely straight.

Step-by-step execution:

1. Step 1: Bring the wrist into flexion with fingers closed in a fist (Position 1)
2. Step 2: Slowly open the fingers and bring the wrist into extension (Position 2) in a fluid and continuous manner
3. Step 3: Alternate between the two positions with a rhythmic and slow movement, never stopping in one position
4. Step 4: Keep the arm straight and shoulder relaxed throughout the exercise

Sets and repetitions: 10 repetitions (1 repetition = moving from Position 1 to 2 and back) — 3-4 times daily

Common mistakes to avoid:

• Holding the stretch position: nerve gliding is a continuous movement, not static stretching
• Forcing the movement until it causes tingling or pain (the nerve should not be stretched)
• Bending the elbow during execution

How to know you’re doing it correctly:
The movement is fluid and smooth, without feeling of blockage or tingling. You may feel a slight tension along the arm that moves with the movement, like a cord sliding. If tingling occurs, reduce the range of motion.

Exercise 2: Tendon Gliding

Difficulty: Easy | Equipment: None | Duration: 3 minutes

Starting position:
Sitting or standing, affected hand in front of the face at eye level with all fingers extended and together.

Step-by-step execution:

1. Step 1: Fingers completely extended and together (starting position)
2. Step 2: Bend fingers in a hook (only the middle and distal phalanges, keeping the knuckles straight)
3. Step 3: Close into a complete fist
4. Step 4: Open to a flat fist (fingers bent at the base with tips touching the upper part of the palm)
5. Step 5: Close to a tight complete fist, return to position 1 and repeat the cycle

Sets and repetitions: 10 complete cycles — 3 times daily

Common mistakes to avoid:

• Skipping one of the 5 positions, reducing the effectiveness of tendon gliding
• Performing transitions too quickly without fully reaching each position
• Forcing the fingers if stiffness is felt: each position should be reached without pain

How to know you’re doing it correctly:
You feel an increasing sense of fluidity in the fingers as the cycles progress. Transitions between positions become smoother, promoting free gliding of tendons in the carpal tunnel.

Stretching

Exercise 3: Wrist Flexor Stretching

Difficulty: Easy | Equipment: None | Duration: 2 minutes

Starting position:
Standing or sitting, extend the affected arm in front of the body with elbow completely straight and palm facing up.

Step-by-step execution:

1. Step 1: With the opposite hand, grasp the fingers of the affected hand
2. Step 2: Gently pull the fingers downward, extending the wrist
3. Step 3: Hold the position for 30 seconds, breathing normally
4. Step 4: Release slowly and repeat

Sets and repetitions: 3 repetitions of 30 seconds — 2-3 times daily

Common mistakes to avoid:

• Bending the elbow during stretching
• Forcing excessively until causing wrist pain or finger tingling
• Rotating the shoulder to compensate for lack of flexibility

How to know you’re doing it correctly:
You feel a moderate and pleasant tension along the inner forearm (from elbow to wrist). It should not cause finger tingling.

Exercise 4: Wrist Extensor Stretching

Difficulty: Easy | Equipment: None | Duration: 2 minutes

Starting position:
Standing or sitting, extend the affected arm in front of the body with elbow completely straight and palm facing down.

Step-by-step execution:

1. Step 1: With the opposite hand, grasp the back of the affected hand
2. Step 2: Gently flex the wrist downward, bringing the fingers toward the floor
3. Step 3: Hold the position for 30 seconds, breathing normally
4. Step 4: Release slowly and repeat

Sets and repetitions: 3 repetitions of 30 seconds — 2-3 times daily

Common mistakes to avoid:

• Forcing the wrist too far down causing pain
• Contracting forearm muscles during stretching (they should remain relaxed)
• Bending the elbow

How to know you’re doing it correctly:
You feel a moderate tension along the upper forearm. The wrist gradually flexes more over the weeks, indicating improved flexibility.

Exercise 5: Prayer Stretch

Difficulty: Easy | Equipment: None | Duration: 2 minutes

Starting position:
Standing or sitting with erect posture. Press palms together in front of the chest, fingers pointing upward, elbows open to the sides.

Step-by-step execution:

1. Step 1: Keeping palms completely together, slowly lower hands toward the waist
2. Step 2: Stop when you feel moderate tension on the wrists
3. Step 3: Hold the position for 30 seconds
4. Step 4: Return hands to chest level and repeat

Sets and repetitions: 3 repetitions of 30 seconds — 2-3 times daily

Common mistakes to avoid:

• Separating palms during descent: they must remain completely in contact
• Lowering hands too much causing wrist pain
• Raising shoulders during execution

How to know you’re doing it correctly:
You feel a symmetrical stretch on the front of both wrists. The sensation should be moderate tension, never painful. With practice, you can lower your hands progressively more.

Strengthening

Exercise 6: Ball Squeeze

Difficulty: Easy | Equipment: Soft stress ball | Duration: 3 minutes

Starting position:
Sitting with arm at the side, elbow slightly bent. Hold the soft ball in the affected hand with all fingers wrapped around.

Step-by-step execution:

1. Step 1: Squeeze the ball with an even grip of all fingers
2. Step 2: Hold the grip for 5 seconds
3. Step 3: Release completely and extend fingers for 3 seconds
4. Step 4: Repeat the squeeze-hold-release cycle

Sets and repetitions: 3 sets x 10 repetitions — 30-second rest between sets

Common mistakes to avoid:

• Using a ball that’s too hard requiring excessive effort
• Squeezing with the wrist in forced extension: keep the wrist in neutral position
• Compensating with arm or shoulder movements

How to know you’re doing it correctly:
You feel muscle work distributed across the hand and forearm without causing tingling or numbness in the fingers. Grip strength improves progressively over weeks.

Exercise 7: Thumb-to-Finger Pinch

Difficulty: Easy | Equipment: Small elastic or therapeutic putty | Duration: 5 minutes

Starting position:
Sitting with forearm resting on table or thigh. Place a small elastic around the thumb and first finger to be trained.

Step-by-step execution:

1. Step 1: Bring thumb and index finger together against elastic resistance, hold 3 seconds
2. Step 2: Release and repeat 10 times
3. Step 3: Move elastic between thumb and middle finger, repeat 10 times
4. Step 4: Continue with ring finger and pinky (10 repetitions for each finger)

Sets and repetitions: 10 repetitions for each finger — 2-3 total sets — 30-second rest between sets

Common mistakes to avoid:

• Using elastic with too high resistance causing rapid fatigue
• Performing movement with flexed wrist: maintain wrist in neutral position
• Forcing the pinky if it causes discomfort (start with stronger fingers)

How to know you’re doing it correctly:
You feel specific muscle work at the base of the thumb and in the involved part of the hand. Movement is precise and controlled, without excessive tremor. Dexterity and pinch strength improve progressively.

Recovery Time

When Is Surgery Needed?

• Severe grade with thenar atrophy and persistent sensory deficit
• Conservative treatment failure after 3-6 months
• Progressive motor deficit

The procedure (transverse ligament release) is a brief and safe surgery with success rate >90%.

You might also be interested in: Lateral epicondylitis (tennis elbow): symptoms, exercises and prevention

Frequently Asked Questions (FAQ)

Frequently Asked Questions

What is the role of a physical therapist in carpal tunnel treatment?

A physical therapist plays a crucial role in the conservative management of carpal tunnel syndrome. They guide individuals through specific exercises, including median nerve mobilization, stretching, and strengthening, to improve nerve gliding and reduce symptoms. Additionally, a physical therapist provides ergonomic advice and education on activity modification to prevent symptom exacerbation.

What are the main causes of carpal tunnel syndrome?

Carpal tunnel syndrome results from the compression of the median nerve within the carpal tunnel. This compression can stem from various factors, including occupational activities involving repetitive wrist movements or prolonged wrist extension. Anatomical predispositions, metabolic conditions, and biomechanical imbalances also contribute to its development.

What are the typical symptoms of carpal tunnel syndrome?

The primary symptoms of carpal tunnel syndrome include tingling, numbness, and pain in the thumb, index, middle, and half of the ring finger. These sensations often worsen at night or with activities involving repetitive hand or wrist movements. Weakness in the hand and difficulty with fine motor tasks may also be experienced.

When is surgical intervention typically considered for carpal tunnel syndrome?

Surgical intervention for carpal tunnel syndrome is generally considered when conservative treatments have not provided sufficient relief or when there is evidence of severe nerve compression. This option is often explored in cases of persistent symptoms, muscle weakness, or nerve damage that progresses despite non-surgical management.

Resources

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Scientific References

1. Padua L, et al. Carpal tunnel syndrome: clinical features, diagnosis, and management. Lancet Neurol. 2016;15(12):1273-1284.
2. Page MJ, et al. Splinting for carpal tunnel syndrome. Cochrane Database Syst Rev. 2012;7:CD010003.
3. Huisstede BM, et al. Carpal tunnel syndrome treatment: systematic review. Arch Phys Med Rehabil. 2010;91(7):981-1004.
4. Atroshi I, et al. Prevalence of carpal tunnel syndrome. JAMA. 1999;282(2):153-158.
5. Fernandez-de-Las-Penas C, et al. Manual therapy in carpal tunnel syndrome. J Orthop Sports Phys Ther. 2015;45(2):102-112.
6. Pinar L, et al. Can we use nerve gliding exercises in women with carpal tunnel syndrome? J Hand Ther. 2005;18(1):34-37.
7. Shi Q, MacDermid JC. Is surgical intervention more effective than non-surgical treatment for carpal tunnel syndrome? J Orthop Surg Res. 2011;6:17.
8. Gerritsen AA, et al. Splinting vs surgery for carpal tunnel syndrome. JAMA. 2002;288(10):1245-1251.
9. Bland JD. Carpal tunnel syndrome. BMJ. 2007;335(7615):343-346.
10. Osterman M, et al. Carpal tunnel syndrome: current treatment. Hand Clin. 2019;35(1):7-14.

Dr. Cosimo Pilotto — physical therapist | MyPhysioHelp.it

Related articles:

• Carpal Tunnel from Mouse and Keyboard
• Epicondylitis from Mouse
• Neck Pain from Computer
• De Quervain’s
• Workstation Ergonomics
• Computer-Related Conditions

Sources and Scientific References

1. Gräf JK et al. (2022). [Physiotherapy and sports therapeutic interventions for treatment of carpal tunnel syndrome : A systematic review]. Schmerz. 36:256-265. DOI | PubMed
2. Wipperman J et al. (2016). Carpal Tunnel Syndrome: Diagnosis and Management. Am Fam Physician. 94:993-999. PubMed
3. Jiménez-Del-Barrio S et al. (2022). The effectiveness of manual therapy on pain, physical function, and nerve conduction studies in carpal tunnel syndrome patients: a systematic review and meta-analysis. Int Orthop. 46:301-312. DOI | PubMed
4. Shem K et al. (2020). Effective self-stretching of carpal ligament for the treatment of carpal tunnel syndrome: A double-blinded randomized controlled study. J Hand Ther. 33:272-280. DOI | PubMed
5. Jiménez Del Barrio S et al. (2018). Conservative treatment in patients with mild to moderate carpal tunnel syndrome: A systematic review. Neurologia (Engl Ed). 33:590-601. DOI | PubMed