STANDARDIZATION OF THE TECHNIQUE FOR MEASURING SUPRASPINATUS MUSCLE VOLUME IN MAGNETIC RESONANCE IMAGING OF PATIENTS WITH ROTATOR CUFF INJURY

• Grant number: 24/09288-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: December 01, 2024
• End date: November 30, 2025
• Field of knowledge: Health Sciences - Medicine - Medical Clinics
• Principal Investigator: Guilherme Grisi Mouraria
• Grantee: Thiago Hideki Shimoura de Oliveira
• Host Institution: Hospital de Clínicas (HC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Introduction: Tendinopathies and rotator cuff tendon ruptures are highly prevalence in the general population and increases with age. Chronic or extensive injury in the Supraspinatus muscle can progress to atrophy and muscular fatty degeneration. A degeneration is an important predictor of surgical results, being associated with greater chances of new ruptures. Fatty infiltration is assessed on MRI magnetic in the sagittal oblique view in T1 weighting using the Fuchs Classification/Goutallier. Currently, this assessment is made visually by the doctor and does not have a precise measuring instrument to calculate the percentage of muscle and fat in the bellies muscles, which can lead to discrepancies and classification errors. The purpose of the workwill be to implement a standardized technique for analyzing supraspinatus muscle volume fromusing SliceOmatic ® software (TomoVision; Magie Virtuelle Inc). Material and methods: 1.5 Tesla MRI images will be imported in T1 and T2 weightingin Coronal, Sagittal Oblique and Axial cuts for the SliceOmatic® software (TomoVision;Magie Virtuelle Inc) of patients being followed up at the Orthopedics outpatient clinic. Will be analyzed the muscle volume of the Supraspinatus measured in cubic centimeters. Will be determined volumes in each cut and an average volume is obtained. Supraspinatus tendon injury will be researched in the Coronal T2 section and the degree of retraction will be measured using a digital ruler available in the PACS software. The degree of retraction will be measured in centimeters considering the distance between the tendon insertion ("Foot-print") and the place where the torn stump is located on the humeral head.Non-categorical variables (muscle volume and degree of retraction) will be tested by the testfrom Kolmogorov-Smirnov. Thus, in the study of these variables, tests of Spearman or Pearson. All analyzes will be conducted using PASW statistics 23.0 software (SPSS Inc., Chicago, USA), adopting a significance level of 5% (P < 0.05).