title: Ulnar collateral ligament: differentiation of displaced and nondisplaced tears with US.
abstract: OBJECTIVE
  To determine the usefulness of ultrasound (US) in the differentiation of displaced and nondisplaced tears of the ulnar collateral ligament (UCL).
  
  
  METHODS
  A 7.5-10-MHz linear-array transducer was used to examine 69 patients in whom a UCL tear was suspected, 43 of whom also underwent surgery. The US findings were compared with those obtained at surgery.
  
  
  RESULTS
  Results of US corresponded to results of surgery in 37 of 43 patients. Findings were false-positive in six patients. Twenty-six patients were treated conservatively with thumb casts. These patients showed stability and free range of motion at the first metacarpophalangeal joint at clinical follow-up (9-13 months).
  
  
  CONCLUSIONS
  Sonography is useful for evaluating nondisplaced and retracted tears of the UCL and determining the need for surgery.
authors.affiliation: Department of Radiology II, Hospital of the Sisters of Mercy, Wels, Austria.
authors.forename: I M
authors.initials: IM
authors.lastname: Noszian
authors.forename: L M
authors.initials: LM
authors.lastname: Dinkhauser
authors.forename: E
authors.initials: E
authors.lastname: Orthner
authors.forename: G M
authors.initials: GM
authors.lastname: Straub
authors.forename: M
authors.initials: M
authors.lastname: Csanady
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D017885:Collateral Ligaments / Q000000981:diagnostic imaging* / Q000293:injuries*; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging*; D008022:Ligaments; D008297:Male; D008875:Middle Aged; D012421:Rupture; D012865:Skiing / Q000293:injuries; D013933:Thumb / Q000000981:diagnostic imaging*; D014463:Ultrasonography