title: MR imaging of the shoulder after an impingement test: how long to wait.
abstract: OBJECTIVE
  The purpose of this study was to determine the appropriate minimum waiting time between an impingement test with subacromial injection and subsequent MR imaging to avoid misinterpretation if the injected fluid is still present.
  
  
  CONCLUSIONS
  MR imaging should be delayed a minimum of 24 hr after a subacromial injection. Fluid in the subacromial space 24 hr after subacromial injection is unrelated to an impingement test.
authors.affiliation: Orthopaedic Department, Jewish Hospital, St. Louis, MO 63110, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Wright
authors.forename: H M
authors.initials: HM
authors.lastname: Fritts
authors.forename: G S
authors.initials: GS
authors.lastname: Tierney
authors.forename: D D
authors.initials: DD
authors.lastname: Buss
mesh_terms: D000328:Adult; D000779:Anesthetics, Local; D016022:Case-Control Studies; D005938:Glucocorticoids; D006801:Humans; D008012:Lidocaine; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019534:Shoulder Impingement Syndrome / Q000175:diagnosis*; D013997:Time Factors; D014221:Triamcinolone
chemical_list: D000779:Anesthetics, Local; D005938:Glucocorticoids; D014221:Triamcinolone; D008012:Lidocaine