title: Can knitting structure affect dilation of polyester bifurcated prostheses? A randomized study with the use of helical computed tomography scanning.
abstract: OBJECTIVE
  The aim of this study was to prospectively evaluate the postoperative dilation of two types of knitted polyester arterial prostheses with the use of helical computed tomographic scanning.
  
  
  METHODS
  Thirty-four patients who underwent aortoiliac or aortofemoral bifurcation grafting were randomized to receive a collagen-sealed warp-knitted polyester graft (n = 16 patients) or a gelatin-sealed Köper-knitted polyester graft (n = 18 patients). Alterations in size of all parts of the grafts were evaluated by helical computed tomographic scanning at postoperative day 8, at 3 months, and at 6 months.
  
  
  RESULTS
  On postoperative day 8, the mean dilation of the Köper-knitted grafts was 18% +/- 8% for the stem and 15% +/- 12% for the limbs. At the same time period, the mean dilation of warp-knitted grafts was 27% +/- 13% for the stem and 33% +/- 18% for the limbs. No increase in graft dilation was observed at 3 and 6 months. Despite the wide range of values among patients with the same graft type, at each time interval, the Köper-knitted grafts dilated significantly less than the warp-knitted grafts (P <. 05).
  
  
  CONCLUSIONS
  In this randomized study, helical computed tomographic scanning was an accurate technique with which to assess graft dilation. For a 6-month follow-up interval, the Köper-knitted polyester structure dilated less than the warp-knitted structure. Longer-term serial scans should allow a better understanding of the clinical significance of graft dilation.
authors.affiliation: Division of Vascular Surgery and the Department of Radiology, Ambroise Paré University Hospital, Boulogne-Billancourt, France.
authors.forename: O A
authors.initials: OA
authors.lastname: Goëau-Brissonnière
authors.forename: S D
authors.initials: SD
authors.lastname: Qanadli
authors.forename: A
authors.initials: A
authors.lastname: Ippoliti
authors.forename: G R
authors.initials: GR
authors.lastname: Pistolese
authors.forename: M
authors.initials: M
authors.lastname: Coggia
authors.forename: J G
authors.initials: JG
authors.lastname: Pollock
mesh_terms: D000368:Aged; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging* / Q000601:surgery*; D001018:Aortic Diseases / Q000000981:diagnostic imaging* / Q000601:surgery*; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging* / Q000601:surgery*; D001807:Blood Vessel Prosthesis / Q000592:standards*; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D007083:Iliac Artery; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011091:Polyesters / Q000592:standards*; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012307:Risk Factors; D013499:Surface Properties; D014057:Tomography, X-Ray Computed
chemical_list: D011091:Polyesters