title: Reliability of MRI assessment of acute musculotendinous groin injuries in athletes.
abstract: OBJECTIVE
  To describe a multi-dimensional MRI assessment approach with a focus on acute musculotendinous groin lesions, and to evaluate scoring reproducibility.
  
  
  METHODS
  Male athletes who participated in competitive sports and presented within 7 days of an acute onset of sports-related groin pain were included. All athletes underwent MRI (1.5 T) according to a standardized groin-centred protocol. From several calibration sessions, a system was developed assessing grade, location and extent of muscle strains, peri-lesional haematoma, as well as other non-acute findings commonly associated with long-standing groin pain. Kappa (K) statistics and intraclass correlation coefficients (ICCs) were used to describe intra- and inter-rater reproducibility.
  
  
  RESULTS
  Seventy-five athletes (mean age 26.6 ± 4.4 years) were included in the analyses, and 85 different acute lesions were observed. Adductor longus lesions were most common (42.7 %) followed by rectus femoris lesions (16.3 %). Kappa values ranged between 0.70 and 1.00 for almost all categorical features for acute lesions, with almost perfect intra- and inter-rater agreement (K = 0.89-1.00) for presence, number, location and grading of lesions. ICCs ranged between 0.77 and 1.00 for continuous measures of acute lesion extent.
  
  
  CONCLUSIONS
  A standardized MRI assessment approach of acute groin injuries was described and showed good intra- and inter-rater reproducibility.
  
  
  CONCLUSIONS
  • A multidimensional MRI assessment approach for acute groin injuries was described. • Standardized MRI assessment of acute musculotendinous groin injuries has high reproducibility. • Injury location and injury extent can be scored reliably using 1.5 T MRI.
authors.affiliation: Aspetar, Orthopaedic and Sports Medicine Hospital, Sports City Street, P.O. Box 29222, Doha, Qatar. Andreas.serner@aspetar.com.|Sports Orthopaedic Research Center-Copenhagen (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Denmark. Andreas.serner@aspetar.com.
authors.forename: Andreas
authors.initials: A
authors.lastname: Serner
authors.affiliation: Department of Radiology, University of Erlangen-Nuremberg, Erlangen, Germany.|Quantitative Imaging Center (QIC), Department of Radiology, Boston University School of Medicine, Boston, MA, USA.
authors.forename: Frank W
authors.initials: FW
authors.lastname: Roemer
authors.affiliation: Aspetar, Orthopaedic and Sports Medicine Hospital, Sports City Street, P.O. Box 29222, Doha, Qatar.|Sports Orthopaedic Research Center-Copenhagen (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Denmark.
authors.forename: Per
authors.initials: P
authors.lastname: Hölmich
authors.affiliation: Sports Orthopaedic Research Center-Copenhagen (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Denmark.
authors.forename: Kristian
authors.initials: K
authors.lastname: Thorborg
authors.affiliation: Clinical Epidemiology and Training Unit, Department of Medicine, Boston University School of Medicine, Boston, MA, USA.
authors.forename: Jingbo
authors.initials: J
authors.lastname: Niu
authors.affiliation: Aspetar, Orthopaedic and Sports Medicine Hospital, Sports City Street, P.O. Box 29222, Doha, Qatar.
authors.forename: Adam
authors.initials: A
authors.lastname: Weir
authors.affiliation: Aspetar, Orthopaedic and Sports Medicine Hospital, Sports City Street, P.O. Box 29222, Doha, Qatar.|The Sports Physician Group, Department of Sports Medicine, OLVG West, Amsterdam, The Netherlands.|Amsterdam Center of Evidence Based Sports Medicine, Academic Medical Center, Amsterdam, The Netherlands.
authors.forename: Johannes L
authors.initials: JL
authors.lastname: Tol
authors.affiliation: Quantitative Imaging Center (QIC), Department of Radiology, Boston University School of Medicine, Boston, MA, USA.
authors.forename: Ali
authors.initials: A
authors.lastname: Guermazi
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000000981:diagnostic imaging*; D006119:Groin / Q000000981:diagnostic imaging* / Q000293:injuries*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000293:injuries; D011446:Prospective Studies; D015203:Reproducibility of Results; D013708:Tendon Injuries / Q000000981:diagnostic imaging; D055815:Young Adult
keywords: Adductor; MSK imaging; Muscle injury; Radiology; Reproducibility