title: FATTY MUSCLE INFILTRATION IN CUFF TEAR: PRE AND POST OPERATIVE EVALUATION BY MRI.
abstract: OBJECTIVE
  To evaluate the fatty infiltration and atrophy of the supraespinatus in the pre- and postoperative of a rotator cuff lesion (RCL), by MRI.
  
  
  METHODS
  Ten patients with full-thickness rotator cuff tears who had undergone surgical arthroscopic rotator cuff repair between September and December 2011 were included. This is a prospective study, with analysis and comparison of fatty infiltration and atrophy of the supraespinatus. The occupation ratio was measured using the magic selection tool in Adobe Photoshop CS3((r)) on T1 oblique sagittal Y-view MRI. Through Photoshop, the proportion occupied by the muscle belly regarding its fossae was calculated.
  
  
  RESULTS
  There was a statistically significant increase in the muscle ratio (p=0.013) comparing images pre and postoperative, analyzed by the Wilcoxon T test.
  
  
  CONCLUSIONS
  The proportion of the supraspinal muscle above the pit increases in the immediate postoperative period, probably due to the traction exerted on the tendon at the time of repair. Level of Evidence II, Cohort Study.
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Alberto Naoki
authors.initials: AN
authors.lastname: Miyazaki
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Pedro Doneux
authors.initials: PD
authors.lastname: Santos
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Luciana Andrade
authors.initials: LA
authors.lastname: da Silva
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Guilherme do Val
authors.initials: Gdo V
authors.lastname: Sella
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Eduardo Régis de Alencar Bona
authors.initials: ER
authors.lastname: Miranda
authors.affiliation: Faculdade de Ciências Médicas da Santa Casa de São Paulo, "Pavilhão Fernandinho Simonsen", Department of Orthopedics and Traumatology, Shoulder and Elbow Group, São Paulo, SP, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Zampieri
keywords: Magnetic resonance imaging.; Muscular atrophy; Rotator cuff/pathology