Recent onset arthritis in the elderly: a 5 year longitudinal observational study

Area of Science:

• Rheumatology
• Geriatric Medicine
• Clinical Epidemiology

Background:

• Recent onset arthritis in individuals over 60 often mimics rheumatoid arthritis (RA).
• Understanding the diverse diagnoses, disease progression, and outcomes in this demographic is crucial for effective management.

Purpose of the Study:

• To investigate the spectrum of diagnoses, clinical course, and long-term outcomes of elderly patients presenting with recent-onset arthritis resembling RA.
• To identify risk factors for poor functional prognosis and increased mortality in this population.

Main Methods:

• A 5-year longitudinal observational study involving 92 consecutive patients aged 60 and above with recent onset arthritis.
• Patients were assessed for diagnosis (RA vs. non-RA), disease activity, functional status (Health Assessment Questionnaire - HAQ), and radiological progression.
• Mortality data and risk factors were analyzed over the 5-year follow-up period.

Main Results:

• 48% of patients were diagnosed with RA according to 1987 criteria; 52% had non-RA diagnoses (undifferentiated polyarthritis, oligoarthritis with polymyalgic symptoms).
• RA patients exhibited more severe disease at onset (more swollen joints, longer morning stiffness, higher physician global assessment, and HAQ scores) compared to non-RA patients.
• Female sex, RA diagnosis, and baseline HAQ score ≥1.4 were risk factors for poor 5-year functional outcome. Mortality was increased in rheumatoid factor-positive (RF+) RA patients, with male sex, age, and RF+ status being significant risk factors within the cohort.

Conclusions:

• Elderly-onset arthritis is a heterogeneous condition with an overall favorable functional prognosis.
• Women with elderly-onset RA and baseline functional disability are at risk for poorer outcomes.
• Mortality is specifically elevated in elderly-onset RF+ RA patients.