Hand tenosynovitis on MRI plus erosions on ultrasound identified anti-CCP-positive people most likely to develop arthritis

Design

Prospective cohort

Population

130 anti-CCP-positive individuals with musculoskeletal symptoms but no clinical synovitis

Primary outcome

Progression to inflammatory arthritis

Effect

36.9% progressed over median 36.5 months; MRI hand tenosynovitis plus US erosions HR 5.83

Anti-CCP-positive people with joint pain but no swollen joints are at high risk of rheumatoid arthritis, but not all progress. This prospective cohort imaged 130 such individuals with contrast-enhanced 3T MRI of the dominant or most symptomatic hand and both feet, and with a 36-joint, 18-tendon ultrasound protocol.

Every participant had at least one MRI abnormality, so 'any MRI finding' was not useful; ultrasound was abnormal in 25.4%. Over a median 36.5 months, 48 (36.9%) progressed to inflammatory arthritis. Of the MRI findings, only hand tenosynovitis was associated with progression in both the binary and continuous analyses, and ultrasound-detected erosions were the most consistent ultrasound predictor. Individuals with both had the highest risk (hazard ratio 5.83).

This moves at-risk assessment from 'is there anything on the scan' to specific features: tenosynovitis and erosions. In India, ultrasound is far more accessible than MRI, so a careful ultrasound for erosions is a realistic first step, with MRI reserved for uncertainty. Whether treating high-risk individuals early prevents arthritis is a separate question that trials are still answering.

• In anti-CCP-positive patients with joint pain but no synovitis, look specifically for erosions on ultrasound of hands and feet.
• If MRI is available, ask specifically about hand flexor tenosynovitis rather than any abnormality.
• Consider closer follow-up for those with tenosynovitis or erosions.
• Do not treat minor MRI findings alone as disease; all at-risk individuals here had some.
• Advise smoking cessation and explain the symptoms that should prompt early review.

Why it matters

It replaces a vague 'abnormal scan' with two specific features that separate high- from lower-risk individuals.

Don't overread it

One centre and 48 progression events; the imaging identifies risk but does not show that early treatment prevents arthritis.

The statistics, in plain English

A hazard ratio of 5.83 means those with both features progressed at almost six times the rate of those with neither at any point in follow-up. The abstract does not give a confidence interval, so the precision of that estimate is unknown.

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