POS0497 A RELIABILITY EXERCISE USING CONSENSUAL DEFINITIONS FOR THE ULTRASONOGRAPHY OF THE SHOULDER IN RHEUMATOID ARTHRITIS

Abstract

Background:Although numerous clinical tests for the diagnosis of painful shoulder are available, differentiating articular from periarticular lesions may be difficult in daily practice. Fortunately, the precise diagnosis of shoulder pain in RA benefited from a reliable imaging modality to detect its exact origin as ultrasonography (US).Objectives:This study aimed to assess the intraobserver and interobserver reliabilities of the ultrasonographic findings for patients with established RA having shoulder pain in a patient-based exercise among maghrebian rheumatologists experts on US.Methods:A total of 7 operators examined 10 patients in 2 rounds independently and blindly of each other.Each patient underwent a US scanning of the painful shoulder in four sites based on US technical guidelines of the European society of musculoskeletal radiology: long head of Biceps (LHB), subscapularis recess, posterior recess and axillary recess. The presence of a subdeltoid or subcoracoid bursitis or the presence of transfixiant tear of the suprasupinatus were notified if present. Intra and inter-observer reliabilities were calculated.Results:Intraobserver reliability was excellent for GS synovitis in subscapularis and posterior recesses (k=0.91 for both) and for subcoracoid bursitis (k=0.81). It was good in case of presence of a subdeltoid bursitis (k=0.79), transfixiant tear of the suprasupinatus (k=0.65), GS synovitis and effusion in LHB (k=0.67 and 0.6 respectively) and subdeltoid bursitis (k= 0.79). Interobserver reliability was good for PD for LHB signals searched longitudinally (k=0.78) and transversally (k=0.78). It was moderate for GS for LHB synovitis (k=0.55). Interobserver agreement was poor for effusion and GS synovitis for subscapularis, posterior and axillary recesses. It was very poor and/or absent for PD signals in these recesses.Conclusion:US is a reliable imaging tool for shoulder in RA especially with regard to LHB effusion, GS and PD synovitis. Interobserver reliability of subscapularis, posterior and axillary recesses could be optimized by standardization of sites to assess.