title: The objective diagnosis of early tennis elbow by magnetic resonance imaging.
abstract: OBJECTIVE
  To identify the salient magnetic resonance imaging (MRI) features of tennis elbow. An objective diagnosis is important when managing work-related incapacity due to ill-defined lateral arm pain.
  
  
  METHODS
  Twenty-three symptomatic and 17 asymptomatic elbows in 20 patients with tennis elbow, no evidence of other pathology and no previous treatment were imaged using established MRI sequences.
  
  
  RESULTS
  In the symptomatic elbows, the common extensor origin (CEO) showed signs of oedema in 23, thickening in 19, peri-tendon oedema in 3 and tears in 13 cases. More extensive abnormalities were demonstrated in only two elbows. Six out of 17 asymptomatic elbows also showed oedema in the CEO.
  
  
  CONCLUSIONS
  The CEO is confirmed as the primary site of MRI changes in tennis elbow. Oedema was commonly found in asymptomatic elbows, necessitating the presence of thickening or tears in the CEO tendon to objectively diagnose tennis elbow on MRI.
authors.affiliation: Middlesbrough General Hospital, Ayresome Green Lane, Middlesbrough TS5 5AZ, UK. dmackay@supanet.com
authors.forename: David
authors.initials: D
authors.lastname: Mackay
authors.forename: Amar
authors.initials: A
authors.lastname: Rangan
authors.forename: G
authors.initials: G
authors.lastname: Hide
authors.forename: Tracey
authors.initials: T
authors.lastname: Hughes
authors.forename: Joanne
authors.initials: J
authors.lastname: Latimer
mesh_terms: D000328:Adult; D004487:Edema / Q000209:etiology / Q000473:pathology; D004550:Elbow / Q000473:pathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D013716:Tennis Elbow / Q000150:complications / Q000175:diagnosis* / Q000473:pathology