title: Extracorporeal shock-wave lithotripsy for stones in middle third of ureter (overlying pelvic bone).
abstract: OBJECTIVE
  To compare the results of using Dornier HM3 and Medstone STS lithotriptors to treat a ureteral stone overlying the pelvic bone (mid third of ureter) requiring the patient to be in the prone position.
  
  
  METHODS
  The ease of use with each lithotriptor was evaluated and a retrospective review of the results using a Dornier HM3 in 53 patients and a Medstone STS in 143 patients was performed. The chi-square test was used to determine statistical difference.
  
  
  RESULTS
  With single stones, the re-treatment rate, the post-ESWL secondary procedure rate, and the stone-free rate were 6 percent, 13 percent, and 75 percent, respectively, with the Dornier, and 6 percent, 8 percent, and 80 percent, respectively, with the Medstone. There was no statistically significant difference between these outcome results (p > 0.05).
  
  
  CONCLUSIONS
  The prone position was difficult to achieve with the Dornier HM3, while the Medstone STS, a tubeless lithotriptor, allowed easy positioning of the patient in the prone position on its flat table. Satisfactory results were achieved using either machine.
authors.affiliation: Midwest Urologic Stone Unit, Hennepin County Medical Center, Minneapolis, Minnesota.
authors.forename: A S
authors.initials: AS
authors.lastname: Cass
mesh_terms: D004867:Equipment Design; D005500:Follow-Up Studies; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008096:Lithotripsy / Q000295:instrumentation*; D010384:Pelvic Bones; D016684:Prone Position; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome; D014514:Ureteral Calculi / Q000453:epidemiology / Q000628:therapy*