INTRA-RATER AND INTER-RATER RELIABILITY STUDY OF A MEASUREMENT METHOD FOR THE PATHWAY OF THE SUPRASPINATUS INTRAMUSCULAR TENDON BY 3.0 TESLA MRI IMAGES: THE SHEAR FORCE ANGLE ANTERIOR POSTERIOR

Abstract

Objective: The aim of this study was to establish intra-rater and inter-rater reliability of a measurement method for the pathway of the supraspinatus intramuscular tendon by 3.0 tesla MRI images. Methods: The scapula and intramuscular tendon extraction DICOM data was made to extract only a scapula domain and intramuscular tendon domain. The shear force angle anterior posterior (SFA-AP) was measured as the pathway of supraspinatus intramuscular tendon with respect to the glenoid plane on three-dimensional (3D) models of the bone and intramuscular tendon. SFA-AP of supraspinatus was measured on 3D models of the bone and intramuscular tendon. The mean and standard deviation of SFA-AP of supraspinatus was calculated. Intra-rater reliability and inter-rater reliability were evaluated by the intraclass correlation coefficient (ICC), the standard error of the mean (SEM) and the minimal detectable change (MDC). Inter-rater reliability was evaluated by three raters. Results: As for intra-rater reliability, SFA-AP of supraspinatus measured averaged [Formula: see text], with ICC (1,1) of 0.978, with ICC (1,3) of 0.993, with SEM of 0.53, with MDC of 1.46[Formula: see text]. As for inter-rater reliability, SFA-AP of supraspinatus measured averaged [Formula: see text] (rater1), SFA-AP measured averaged [Formula: see text] (rater2), SFA-AP measured averaged [Formula: see text] (rater3), with ICC (2,1) of 0.896, with ICC (2,3) of 0.963, with SEM of 1.11, with MDC of 3.09[Formula: see text]. Conclusions: 3D models of the bone and intramuscular tendon were evaluated as intra-rater and inter-rater reliabilities. SFA-AP of supraspinatus is guaranteed by one measurement.