What question did this study set out to answer?

To assess the prevalence and implications of median nerve swelling in rheumatoid arthritis patients over eight years.

April 24, 2026Open Access

Median nerve swelling in RA patients: an 8-year longitudinal MRI-based study

SWSu WuChinese University of Hong Kong ANAlex Wing Hung NgChinese University of Hong Kong JGJames Francis GriffithChinese University of Hong Kong

Key Points

To assess the prevalence and implications of median nerve swelling in rheumatoid arthritis patients over eight years.
Longitudinal MRI assessments were conducted on rheumatoid arthritis patients.
Participants were evaluated at baseline and year 8 for median nerve swelling and carpal tunnel syndrome.
Functional impairment was assessed in patients with and without median nerve swelling.
One-third of RA patients had MRI indications for carpal tunnel syndrome at baseline, rising to nearly half by year 8.
Median nerve swelling was not associated with other conditions like tenosynovitis or structural damage.
Functional impairment was more than twice as common in patients with median nerve swelling than those without.

Abstract

Almost one-third of RA patients fulfilled MRI criteria for carpal tunnel syndrome (CTS) diagnosis at baseline, increasing to almost one-half of patients at year 8. Long-term median nerve swelling is not related to tenosynovitis, synovitis or structural damage. Functional impairment was over twice as common in patients with undue median nerve swelling than those without undue median nerve swelling.

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