Thursday, September 19, 2013

Your Carpal Tunnel. What's Unusual about What Goes Wrong? How to Test and Treat.

What is Carpal Tunnel Syndrome?

Carpal Tunnel
Carpal tunnel syndrome is a painful disorder of the hand caused by pressure on your median nerve as it runs through the carpal tunnel of the wrist.

Symptoms include numbness, pins and needles, and pain (particularly at night). Anything that causes swelling inside the wrist can cause carpal tunnel syndrome, including repetitive hand movements, pregnancy and arthritis.


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What is Your Carpal Tunnel?

carpal tunnel syndrome

Your carpal tunnel protects vital structures such as the median nerve, blood vessels and tendons as they pass to and from your hand. The palm side of your wrist has a band of strong ligaments (flexor retinaculum) that attach to the carpal (wrist) bones at either side. The rear of the tunnel is a curved compilation of the wrist bones.

What's the Cause of Carpal Tunnel Syndrome?

Carpal Tunnel Syndrome symptoms begin when the pressure inside the tunnel becomes too high. This results in your median nerve becoming compressed as it passes through the small tunnel.

The carpal tunnel pressure increase occurs when either of two things happens:

  1. The tunnel space decreases, such as when the wrist swells eg after a traumatic injury, partial subluxation of the carpal bones or fracture or tenosynovitis.
  2. When the contents of the tunnel (median nerve, blood vessels and tendons) enlarge. 
Both of these situations increase the pressure on the nerve, leading to the carpal tunnel symptoms.

Other Common Causes of Carpal Tunnel Syndrome

Frequently, the median nerve is compressed elsewhere along its path - not in the carpal tunnel - and replicates carpal tunnel symptoms.

Most often compression occurs in your neck but can occur anywhere along the nerve path as it travels to your hand. This entrapment predisposes the nerve to develop carpal tunnel symptoms.

How does this occur?

Healthy nerves have a supply of fluid called axoplasmic fluid, which provides the nerve with ...

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Potential Compression Sources

Your symptoms can originate from elsewhere along the ...
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Abnormal Neurodynamics

Your nerves should freely travel along their pathways between your spine and your fingers. Any interference of their slide mobility could cause symptoms eg scar tissue, tight muscles.

Your physiotherapist can assess your neurodynamics for abnormalities. Tal-Akabi & Rushton (2000).

Hormonal Factors

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What’s the Symptoms of Carpal Tunnel Syndrome?

carpal tunnel syndrome

Carpal Tunnel Syndrome (CTS) sufferers will usually experience the following symptoms in their hand or fingers:
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How is Carpal Tunnel Syndrome Diagnosed?

Your physiotherapist or doctor will generally diagnose carpal tunnel syndrome based on your symptoms. They use various tests such as Phalen’s test, Tinel’s test or the wrist flexion/median nerve compression test that compress the carpal tunnel. It is also important to thoroughly examine your lower neck and upper back joints, plus your nerve tissue mobility - neurodynamics.

Your doctor may refer you for nerve conduction studies or EMG studies to quantify if your nerve electrical impulses are slowed by compression within the carpal tunnel or further up the arm. Craig & Richardson (2011).

Ultrasound may reveal median nerve enlargement. X-ray may identify coexisting pathologies. MRI, CT scans are not normally required. Hobson-Webb & Padua (2009). 

Carpal Tunnel Syndrome Treatment

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Night Wrist Splint

A nighttime wrist splint is beneficial to eliminate wrist bending and therefore carpal tunnel symptoms. Muller et al (2004). Your physiotherapist may recommend a splint. A suitable carpal tunnel wrist splint can be found here: http://bit.ly/1e0ZJp3

Physiotherapy

Physiotherapy is beneficial for most carpal tunnel sufferers especially in mild to moderate cases.
Your physiotherapist will address:
  • Carpal bone mobilisation and flexor retinaculum stretching to open the carpal tunnel. Tal-Akabi & Rushton (2000).
  • Nerve and tendon gliding exercises to ensure full unrestricted nerve motion is available. McKeon & Hsieh (2008).
  • Muscle and soft tissue extensibility. Moraska (2008).
  • Cervicothoracic spine to correct any referral or double crush syndromes. Kwon et al (2006).
  • Grip and pinch, thumb abduction and forearm strengthening in later phases. Pinar et al (2005).
  • Comprehensive upper limb, wrist and hand ROM strengthening and endurance exercises. 
  • Posture, fine motor and hand dexterity exercises. Abd-Elkader et al (2010).
double crush syndrome

Ultrasound Therapy, Acupuncture, Massage & Yoga

Ultrasound therapy has been shown to assist ...
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Ergonomic Assessment

If the carpal tunnel has been caused at work, then ...
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TENS Machine

A TENS machine (transcutaneous electrical muscle stimulation) has been shown to ease the pain associated with carpal tunnel syndrome. Kara et al (2010). More information about TENS machines can be found here: http://bit.ly/18OPEpb

Carpal Tunnel Surgery

The American Academy of Orthopaedic Surgeons (AAOS) recommend that conservative treatment be attempted initially. Keith et al (2009).
Before you undertake carpal tunnel surgery it is important that you 

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What’s Your Carpal Tunnel Syndrome Prognosis?

Mild to moderate sufferers of carpal tunnel syndrome have ...


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...favourable prognosis from conservative treatment. The best results occur within the first three months of treatment.

For more specific advice please consult your physiotherapist or doctor.

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