Carpal Tunnel Syndrome: More Than Numbness and Wrist Pain

Carpal tunnel syndrome is commonly understood as compression of the median nerve at the wrist, leading to pain, tingling, numbness, and weakness in the hand. However, emerging evidence suggests that its effects may extend beyond local nerve symptoms.

A recent cross-sectional study of 100 women compared patients with mild, moderate, and severe carpal tunnel syndrome with healthy controls. The findings showed that women with carpal tunnel syndrome had reduced grip strength, slower reaction times, poorer hand laterality judgment, impaired sensory and motor nerve conduction, increased muscle stiffness, and worse functional scores.

Importantly, greater severity was associated with greater pain and higher stiffness of the abductor pollicis brevis muscle. Reaction time was also moderately related to grip strength and laterality judgment accuracy, suggesting that carpal tunnel syndrome may involve broader sensorimotor and cognitive-motor changes, not only peripheral nerve dysfunction.

For therapists, this highlights the importance of a multidimensional assessment. Evaluation should not rely solely on pain reports or nerve conduction findings. Grip strength, sensory discrimination, reaction time, hand perception, muscle properties, and functional limitations may all provide useful clinical information.

Rehabilitation may therefore need to be personalised according to severity and presentation. Alongside standard approaches such as education, splinting, activity modification, nerve and tendon gliding, and strengthening, therapists may also consider sensorimotor retraining and functional task-based rehabilitation.

The key message is simple: carpal tunnel syndrome affects the hand, but its consequences may involve the whole sensorimotor system. A broader assessment can help guide more targeted and effective therapy.