title: [Application of modified koyanagi technique with coverage by tunica vaginalis of testis in severe hypospadias].
abstract: OBJECTIVE
  To investigate the clinical effect of modified Koyanagi technique with coverage by tunica vaginalis of testis in severe hypospadias.
  
  
  METHODS
  49 cases with severe hypospadias treated from Jan. 2009 to Sep. 2011 were retrospectively studied. 25 patients underwent Koyanagi technique with coverage by tunica vaginalis of testis. 24 cases underwent one-stage Duplay + Duckett technique in the same term. The patients were followed up for 7-24 months.
  
  
  RESULTS
  Among the 25 children treated with Koyanagi procedure, 20 cases were cured, 5 patients had postoperative complications, including urethral fistula in 3 cases,urethral stenosis in 2 cases. At the same time, in the Duplay + Duckett group, 17 cases were cured, 7 children had postoperative complications, including urethral fistula in 4 cases, and urethral stenosis in 3 cases. All the patients with urethral fistula were repaired successfully 6 months after the first surgery; The urethral stenosis were cured by dilatation within 1 to 3 months. The successful rate in the 2 groups had no significant difference(P >0.05).
  
  
  CONCLUSIONS
  Koyanagi technique with coverage by tunica vaginalis of testis is relatively simple with similar effect as Duplay + Duckett technique for severe hypospadias.
authors.forename: Wenyong
authors.initials: W
authors.lastname: Xue
authors.forename: Jinchun
authors.initials: J
authors.lastname: Qi
authors.forename: Caiyun
authors.initials: C
authors.lastname: Yang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Junxiao
authors.initials: J
authors.lastname: Chen
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Su
authors.forename: Lei
authors.initials: L
authors.lastname: Du
authors.forename: Shuwen
authors.initials: S
authors.lastname: Yang
authors.forename: Chanebao
authors.initials: C
authors.lastname: Qu
mesh_terms: D002648:Child; D002675:Child, Preschool; D006801:Humans; D007021:Hypospadias / Q000601:surgery*; D008297:Male; D011183:Postoperative Complications / Q000209:etiology / Q000628:therapy; D012189:Retrospective Studies; D013524:Surgical Flaps / Q000637:transplantation*; D013737:Testis / Q000601:surgery*; D014522:Urethral Diseases / Q000209:etiology / Q000628:therapy; D014525:Urethral Stricture / Q000209:etiology / Q000628:therapy; D014548:Urinary Fistula / Q000209:etiology / Q000601:surgery