A 32-year-old male carpenter from Delhi presents with a 3-week history of progressive weakness of thumb opposition and abduction, along with sensory loss over the lateral three and a half fingers. Examination reveals wasting of the thenar eminence and a positive Phalen's test. Nerve conduction studies show prolonged distal motor latency (6.2 ms) and slowed conduction velocity across the wrist. What is the most appropriate next step in management?

Clinical Context

This patient presents with severe carpal tunnel syndrome (CTS) — the most common entrapment neuropathy of the median nerve. The clinical findings include:

This constellation — particularly the thenar atrophy and distal motor latency >6.0 ms — classifies this as severe CTS, not mild-to-moderate disease.

Severity Classification of CTS (American Academy of Neurology / AAOS Guidelines)

Why Immediate Surgical Decompression?

Why NOT the Other Options?

Conservative management (wrist splinting + NSAIDs) is inappropriate here — thenar atrophy and DML >6.0 ms indicate severe, established disease. Conservative measures cannot reverse denervation and delay definitive treatment, risking permanent motor loss.

EMG is unnecessary — NCS already confirms the diagnosis and severity (DML 6.2 ms). EMG would add information about denervation but would not change the management decision in a patient with overt thenar atrophy.

MRI of the wrist is not indicated — there is no clinical suspicion of a space-occupying lesion, trauma, or atypical presentation. MRI would delay necessary surgical intervention without adding diagnostic value.

Summary

In a patient with thenar atrophy + DML >6.0 ms, the most appropriate next step is immediate carpal tunnel release, which has a 70–90% success rate in halting progression and improving motor function when performed before complete axonal degeneration.

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