Erosive osteoarthritis: is it a separate disease entity?

Area of Science:

• Rheumatology
• Orthopedics
• Radiology

Background:

• Erosive osteoarthritis (EOA) is characterized by hand joint erosions, primarily affecting middle-aged women.
• Diagnosis relies on radiological identification of articular surface erosions.
• The study aimed to determine if these erosions signify a unique clinical entity.

Purpose of the Study:

• To investigate if radiological erosions in EOA are a marker for a specific clinical entity.
• To compare hand osteoarthritis patients with and without erosive features.
• To assess the clinical and serological differences between EOA and non-EOA hand osteoarthritis.

Main Methods:

• Retrospective analysis of 500 patients with symptomatic limb joint osteoarthritis.
• Identification of 24 EOA patients based on radiological criteria.
• Age-sex matching of EOA patients with 24 osteoarthritis of the hand (OAH) patients.

Main Results:

• EOA patients exhibited nearly double the number of abnormal hand joints compared to controls (274 vs. 144).
• Increased involvement was noted in distal and proximal interphalangeal joints, with 71% showing erosions.
• No significant distinguishing serological or other clinical differences were observed between EOA and OAH groups.

Conclusions:

• Radiological erosions in EOA are associated with more severe hand osteoarthritis.
• EOA is not identified as a separate disease entity but rather an aggressive form of hand osteoarthritis.
• EOA may represent the hand manifestation of severe osteoarthritis affecting other joints like the shoulder, hip, and knee.