title: Strength and knot security of braided polyester and caprolactone/glycolide suture.
abstract: BACKGROUND
  Appropriate suture selection is necessary in providing mechanical stability to soft tissue reconstructions. Caprolactone/glycolide (Panacryltrade mark) became a popular suture, possessing excellent handling properties; however, clinical observations questioned the knot security of caprolactone/glycolide. Caprolactone/glycolide is still available on many commercial suture anchor systems. This study compared the security of the knots and ultimate tensile strength of braided caprolactone/glycolide suture to that of a commonly used suture material, braided polyester (Ethibondtrade mark).
  
  
  METHODS
  Suture knots of No. 2 braided polyester suture and No. 2 braided caprolactone/glycolide suture were submersed in a physiologic saline solution and stressed using a continuous (non-cyclic) load, simulating a single maximal loading event in a clinical setting. Continuous loading was done to achieve clinical suture knot failure (3-mm knot slippage), then continued until catastrophic suture failure (suture breakage) occurred. Ten trials of each suture were tested.
  
  
  RESULTS
  Force required to cause knot slippage of 3 mm was greater for braided polyester than for braided caprolactone/glycolide (p <. 0001, unpaired Students' t-test). Forces resulting in catastrophic failure were greater for braided polyester than braided caprolactone/glycolide (p = .0284, unpaired Students' t-test).
  
  
  CONCLUSIONS
  These data have important implications in the selection of suture materials for repair of soft tissue injuries. In the clinical setting, a single maximal loading event may result in suture failure. These data indicate that braided polyester possesses superior in-vitro mechanical properties and suggest that braided polyester may provide greater security in-vivo than braided caprolactone/glycolide suture.
authors.affiliation: Department of Orthopaedic Surgery, Marshfield Clinic, 1000 North Oak Avenue, Marshfield, WI 54449, USA. bibbo.christopher@marshfieldclinic.org
authors.forename: Christopher
authors.initials: C
authors.lastname: Bibbo
authors.forename: Marc J
authors.initials: MJ
authors.lastname: Milia
authors.forename: Robin M
authors.initials: RM
authors.lastname: Gehrmann
authors.forename: Dipak V
authors.initials: DV
authors.lastname: Patel
authors.forename: Robert B
authors.initials: RB
authors.lastname: Anderson
mesh_terms: D004146:Dioxanes / Q000592:standards*; D008422:Materials Testing; D011091:Polyesters / Q000592:standards*; D011093:Polyethylene Terephthalates / Q000592:standards*; D013314:Stress, Mechanical; D013536:Suture Techniques / Q000295:instrumentation; D013537:Sutures / Q000592:standards*; D013718:Tensile Strength
chemical_list: D004146:Dioxanes; C014534:Ethibond; D011091:Polyesters; D011093:Polyethylene Terephthalates; C095495:glycolide E-caprolactone copolymer