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Neurophysiologic evidence of median nerve entrapment in the carpal tunnel was present in 25% of patients with late
Lyme borreliosis. Sixty-eight of 76 consecutive, prospectively studied patients with late
Lyme underwent neurophysiologic testing. Nineteen reported intermittent hand paresthesias; 17 had neurophysiologically confirmed carpal tunnel syndrome. This was not consistently associated with clinically apparent wrist arthritis or with neurophysiologically evident peripheral neuropathy. We conclude that a significant proportion of patients with late
Lyme borreliosis develop carpal tunnel syndrome.