Carpal tunnel syndrome (CTS) is a common condition that causes numbness, tingling, and pain in the hand and forearm. This condition occurs when one of the major nerves to the hand, the median nerve, becomes squeezed or compressed as it travels through the wrist.¹ In most patients, carpal tunnel syndrome progressively worsens over time, and if left untreated for too long, it can lead to permanent dysfunction of the hand, including the loss of sensation and weakness in the fingers. Therefore, it is crucial to diagnose and treat carpal tunnel syndrome promptly. Early symptoms can often be relieved through various conservative measures:

• Wearing a wrist splint while sleeping 
• Hand exercises to keep the nerve mobile 
• Avoiding certain activities, such as heavy lifting
• A steroid injection into the carpal tunnel 

However, if the pressure and compression of the median nerve persist, they can lead to nerve damage and exacerbating symptoms. To prevent permanent damage, surgery and laser therapy may be recommended.²

Laser therapy, also known as photobiomodulation, offers a promising non-invasive treatment option for CTS. This therapy involves using specific wavelengths of light to penetrate tissues and promote healing at the cellular level. Unlike surgical lasers, laser therapy utilises non-thermal laser or light energy to modulate cellular functions without causing heat or damage to the tissue.³ Various types of lasers are employed in this therapy, such as:

• Low-level laser therapy (LLLT) - Uses low-intensity light, typically in the red or near infrared spectrum and is used to treat soft tissue injuries and alleviate symptoms of nerve compression that is found in carpal tunnel syndrome⁴
• Cold lasers - Often synonymous with LLLT, as they do not produce heat and are designed for tissue healing⁵
• High intensity lasers - sometimes used for more severe causes, but require precise handling to avoid tissue damage⁶

Mechanism of action:

The mechanism of action of laser therapy primarily involves the delivery of specific wavelengths of light that penetrate the skin and are absorbed by mitochondrial chromophores, such as cytochrome C oxidase.⁴ This interaction leads to an increase in the production of adenosine triphosphate (ATP), which is the energy currency of the cells, thereby enhancing cellular metabolism and repair processes.⁵ Elevated ATP levels support nerve healing and tissue regeneration, which are essential for recovering function in the compressed median nerve.⁷ Additionally, laser therapy reduces inflammation by decreasing pro-inflammatory cytokines like interleukin-6 (IL-6) and tumour necrosis factor-alpha (TNF-α) while increasing anti-inflammatory mediators.

This collective action helps lower swelling and reduce nerve irritation.⁶ Furthermore, laser therapy promotes vasodilation, which improves blood flow and oxygenation in the affected region, thereby accelerating healing and reducing oedema by targeting these cellular pathways.⁶ Ultimately, laser therapy alleviates nerve compression, minimises pain, and restores normal nerve function in patients with carpal tunnel syndrome.⁵

Benefits of laser therapy for CTS:

In summary, laser therapy offers a non-invasive alternative for treating carpal tunnel syndrome, presenting several advantages over traditional methods. 

Unlike traditional medications that primarily mask pain, advanced laser therapy actively promotes nerve regeneration, addressing the root cause of the condition for long-term relief. Low-level laser therapy effectively reduces inflammation in the hands and wrists, alleviating pain and stimulating the healing of damaged tissues. One of the remarkable features of this treatment is its ability to enhance the body’s natural nerve regeneration processes by using specific light wavelengths that penetrate deep into tissues, generating nerve growth factors and accelerating the often slow healing process. As the nerves heal, communication between the hands and brain is restored, significantly alleviating symptoms.

Additionally, laser therapy is non-invasive and can be performed in-office without the need for surgery or medications, making it an appealing option for individuals who prefer conservative treatment approaches or who may be concerned about the potential risks and side effects associated with more invasive procedures. Research studies have also demonstrated that laser therapy provides significant pain reduction in the short term, allowing individuals to experience immediate relief from CTS symptoms during routine appointments. Overall, laser therapy stands out as a safe and effective alternative for managing carpal tunnel syndrome, promoting healing while minimising downtime.^8,9

Potential risks and limitations:

Although laser therapy is generally considered safe and non-invasive, some potential risks and side effects need to be considered. The most common side effects are mild and include skin irritation, redness or discomfort at the treatment site. These side effects are temporary and resolve shortly after the session. However, certain conditions should be avoided, such as individuals with certain cancers. This is because it may stimulate cell growth in undesirable ways.¹³ In addition, pregnant women should avoid laser therapy, especially on areas close to the abdomen.¹⁴ Given these risks, patients must undergo a professional assessment before starting laser therapy. 

Procedure:

The treatment process for laser therapy in Carpal Tunnel Syndrome (CTS) typically begins with a thorough assessment by a healthcare professional to determine the suitability of the therapy for the patient’s condition. During the procedure, a handheld laser device is used to deliver low-level laser light to the affected areas of the wrist and hand. The equipment emits specific wavelengths of light that penetrate the skin without causing discomfort, making the treatment painless and non-invasive.⁷ Sessions generally last between 10 to 30 minutes and may be conducted two to three times per week, depending on the severity of the symptoms and the patient’s response to treatment.⁴

Targeted application points usually include the median nerve area in the wrist and surrounding tissues, which may be marked to ensure consistent targeting during each session.⁵ Patients can expect a soothing sensation during the therapy, and there is typically no downtime, allowing them to resume daily activities immediately afterwards. Safety considerations include ensuring that patients are screened for any contraindications, such as pregnancy or certain skin conditions, and the use of appropriate eye protection to safeguard against accidental exposure to the laser light.⁶ Overall, laser therapy provides a promising and practical approach for managing CTS, with a well-defined procedure that emphasises safety and efficacy.

Clinical evidence and research:

Recent studies have explored the clinical efficacy of laser therapy for carpal tunnel syndrome and have shown promising results. A meta-analysis reported that patients treated with low-level laser therapy experienced a reduction in pain and improved hand strength compared to those receiving the placebo.¹⁰ In addition, a study was done that concluded that laser therapy effectively alleviates symptoms like numbness and tingling, making it a suitable option for patients with mild to moderate carpal tunnel syndrome.⁷

When compared to traditional treatments, such as corticosteroid injections and splinting, laser therapy offers several distinct benefits. While corticosteroids provide temporary relief by reducing inflammation, laser therapy works by targeting the underlying cellular mechanisms, promoting tissue healing and nerve regeneration with fewer adverse effects.^11,12 Moreover, studies have shown that laser therapy sustains these improvements over time. For example, Hashmi et al. (2010) found that patients treated with LLLT showed reduced symptom recurrence during a 6-month follow-up period, highlighting its potential long-term benefits.⁵

Despite these findings, the variability in results due to different laser parameters, wavelength, dosage, and frequency is a limitation. Therefore, more research is needed to standardise treatment protocols and explore the long-term impact of laser therapy on diverse patients. 

FAQs

Who is a good candidate for laser therapy?

• Individuals with mild to moderate CTS symptoms (numbness, tingling, pain)
• Patients prefer non-invasive treatments over surgery or medications
• People who haven't found relief from conservative methods (splints, exercises)
• Not suitable for individuals with certain cancers, photosensitivity, or infections
• Pregnant women should avoid laser therapy near the abdomen

What are the expected costs and insurance coverage?

• Costs vary depending on location, clinic, and number of sessions
• Typically ranges from $50 to $200 per session
• Insurance coverage may be limited; some policies may not cover laser therapy for CTS
• Important to check with an insurance provider for specific coverage details

How does laser therapy fit into a broader CTS treatment plan (exercise, ergonomics)?

• Complements conservative treatments (wrist splints, hand exercises)
• Can be combined with ergonomic adjustments (workstation setup, reducing repetitive strain)
• Works alongside physical therapy and stretching routines
• May be used before considering more invasive options like surgery

Summary

In summary, laser therapy presents a promising, non-invasive option for the treatment of carpal tunnel syndrome. This therapy effectively reduces inflammation, promotes tissue regeneration and relieves pain, addressing the root cause of carpal tunnel syndrome rather than masking symptoms such as pain, as seen with traditional treatment. By utilising specific wavelengths of light, laser therapy promotes nerve regeneration, accelerates the healing process and restores normal function in the affected median nerve.

Laser therapy offers a number of advantages, including being a non-surgical, drug-free option with minimal side effects. This treatment is an appealing alternative for individuals who want a conservative treatment approach or those who are wary of the risks associated with surgery or medications. Studies have shown positive short-term outcomes, with patients experiencing reduced symptoms and pain relief. However, laser therapy does have its limitations. The variability in results due to different laser settings, such as wavelengths and dosage, emphasises the need for individualised treatment plans. 

Further research is essential to standardise protocols and optimise therapeutic outcomes for diverse patient populations. As understanding of the treatment evolves, laser therapy could become an even more reliable and accessible option for CTS management.