Approximately 70% to 90% of mild to moderate CTS cases respond well to conservative treatments. However, many patients eventually require surgical intervention. Patients with CTS secondary to diabetes or a wrist fracture generally have a poorer prognosis than those without an identifiable underlying cause. Those with normal electrophysiological studies tend to have less favorable surgical outcomes and more complications compared to those with abnormalities in these tests. The detection of axonal loss in electrophysiological testing indicates a poor prognosis (Sevy et al., 2023). Complications of CTS can stem from the condition itself or from its treatments. CTS may cause irreversible median nerve damage, leading to permanent impairment and disability. Muscle weakness and atrophy at the base of the thumb can result in reduced dexterity. Patients may also experience chronic wrist and hand pain, which can potentially progress to complex regional pain syndrome. The most common complication of carpal tunnel surgery is the development of a neuroma in the palmar cutaneous branch of the median nerve. Other possible complications include hypertrophic scars, joint stiffness, dysesthesias, and incomplete resolution of symptoms (Sevy et al., 2023). Splinting and proper hand ergonomics are crucial in the rehabilitation of CTS. Therapists employ techniques such as ultrasound, iontophoresis, and paraffin wax to reduce swelling and relieve pain, though studies have shown mixed results regarding their effectiveness. Further high- quality research is needed to thoroughly evaluate these interventions. Nerve-gliding exercises, massage, and trigger point release have demonstrated significant improvements in muscle strength, pain reduction, and nerve conduction. Physical and occupational therapists should consider incorporating these methods into their treatment plans (Sevy et al., 2023). As CTS is the most common nerve entrapment neuropathy, affected individuals seek care from various healthcare specialties. If not promptly addressed, symptoms can become debilitating. Clinicians from diverse fields such as obstetrics, orthopedics, neurology, primary care, endocrinology, and rehabilitation therapy play a crucial role in diagnosing and managing CTS. Combined therapy may offer more significant benefits than any single treatment. Therefore, healthcare professionals must educate patients about the risks, benefits, and effectiveness of different treatment options for CTS and help them set realistic expectations regarding their outcomes. Effective communication among healthcare team members is essential to facilitate combined therapies, patient education, and timely treatment, ultimately helping patients regain normal function. A collaborative interprofessional team approach is vital in improving outcomes for CTS patients (Sevy et al., 2023).
Epidemiologically, it has been shown that CTS is associated with age, gender, general body mass index (BMI), diabetes, and pregnancy. Further, it is more common in some populations. The same associations noted above for CTS are strongly associated with sleep disturbances. Sleep disturbances due to age, gender, BMI, pregnancy, and population variations are all associated with sleeping in the lateral position, which supports the hypothesis that a common causative mechanism of CTS is sleeping in a lateral position (Sevy et al., 2023). Patients with a clinical diagnosis of mild CTS typically do not require additional diagnostic studies. Except for pregnant individuals, patients experiencing atypical symptoms, pain-disrupted sleep, persistent numbness or weakness in the hand, or any impairment in hand function should undergo electrodiagnostic testing, including nerve conduction studies. Electromyography (EMG) may also be incorporated to assist in surgical decision making and rule out alternative diagnoses. EMG can reveal the presence of residual axonal integrity even in cases where no sensory or motor components are elicited. Abnormalities detected on electrodiagnostic testing, associated with specific symptoms and signs, are regarded as the gold standard for diagnosing CTS (Sevy et al., 2023). Imaging is required only when a structural abnormality is suspected. Further investigation may be necessary for potential structural issues like tumors or ganglion cysts. Ultrasound and magnetic resonance imaging (MRI) are the preferred methods (Sevy et al., 2023). The symptoms of CTS can mimic a variety of other musculoskeletal and nervous system disorders. When evaluating a patient with suspected CTS, the following conditions should be considered: ● Brachial plexopathy ● Cervical myofascial pain ● Cervical spondylosis ● Compartment syndrome ● Ischemic stroke ● Mononeuritis multiplex ● Multiple sclerosis ● Median neuropathy in the forearm
● Motor neuron disease ● Diabetic neuropathy ● Cervical radiculopathy ● Overuse injury ● Traumatic brachial plexopathy ● Radiation-induced brachial plexopathy ● Neuropathies ● Tendonitis ● Tenosynovitis ● Thoracic outlet syndrome
CTS typically worsens over time and can lead to permanent median nerve damage. The syndrome can recur in up to one-third of patients within five years following surgery.
NERVE ANATOMY
To better understand how carpal tunnel signs and symptoms manifest, a basic understanding of the anatomy and physiology of nerve tissue will aid our efforts. All nerves are composed of cells called neurons. Remember that a neuron is a single nerve cell, and a nerve is a bundle of neurons wrapped together. All neurons have three components that regulate nerve signal conductivity and protect anatomical structure from damage (Netter, 2022). These three parts are depicted in Figure 3.
Figure 3: Three Parts of the Neuron
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