title: Improved time-zero biomechanical properties using poly-L-lactic acid graft augmentation in a cadaveric rotator cuff repair model.
abstract: OBJECTIVE
  Rotator cuff repair failure rates range from 20% to 90%, and failure is believed to occur most commonly by sutures cutting through the tendon due to excessive tension at the repair site. This study was designed to determine whether application of a woven poly-L-lactic acid device (X-Repair; Synthasome, San Diego, CA) would improve the mechanical properties of rotator cuff repair in vitro.
  
  
  METHODS
  Eight pairs of human cadaveric shoulders were used to test augmented and non-augmented rotator cuff repairs. Initial stiffness, yield load, ultimate load, and failure mode were compared.
  
  
  RESULTS
  Yield load was 56% to 92% higher and ultimate load was 56% to 76% higher in augmented repairs. No increase in initial stiffness was found. Failure by sutures cutting through the tendon was reduced, occurring in 17 of 20 non-augmented repairs but only 7 of 20 augmented repairs.
  
  
  CONCLUSIONS
  Our data show that application of the X-Repair device significantly increased the yield load and ultimate load of rotator cuff repairs in a human cadaveric model and altered the failure mode but did not affect initial repair stiffness.
authors.affiliation: Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, OH 44195, USA. mccarrj@ccf.org
authors.forename: Jesse A
authors.initials: JA
authors.lastname: McCarron
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Milks
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Joseph P
authors.initials: JP
authors.lastname: Iannotti
authors.forename: Kathleen A
authors.initials: KA
authors.lastname: Derwin
mesh_terms: D001672:Biocompatible Materials / Q000627:therapeutic use*; D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D019344:Lactic Acid / Q000627:therapeutic use*; D008875:Middle Aged; D008953:Models, Anatomic; D011091:Polyesters; D011108:Polymers / Q000627:therapeutic use*; D017006:Rotator Cuff / Q000601:surgery*
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide)