title: Supplementation of rotator cuff repair with a bioresorbable scaffold.
abstract: BACKGROUND
  Repair of a torn rotator cuff should have sufficient initial strength of the fixation to permit appropriate rehabilitation.
  
  
  OBJECTIVE
  Augmentation with a woven polylactic acid scaffold strengthens repairs of the rotator cuff.
  
  
  METHODS
  Controlled laboratory study.
  
  
  METHODS
  In the suture-anchor model, 10 pairs of sheep infraspinatus tendons were detached and repaired to suture anchors. In half of the matched specimens, the repair was reinforced with a woven poly-lactic acid scaffold repaired with the tendon to bone. In the bone-bridge model, sutures were passed through a trough and over a bone bridge distal to the greater tuberosity; half were reinforced by the scaffold. The repairs were tested to failure with a hydraulic testing machine.
  
  
  RESULTS
  The mean ultimate strength of suture-anchor repairs augmented with the scaffold (167.3 +/- 53.9 N) was significantly greater than that of nonaugmented fixation (133.2 +/- 38.2 N). Failure occurred when the tendon pulled through the sutures; the scaffold remained intact. Scaffold reinforcement of the bone bridge significantly increased the ultimate strength from 374.6 +/- 117.6 N to 480.9 +/- 89.2 N, and the scaffold remained intact in 8 of 10 specimens.
  
  
  CONCLUSIONS
  The scaffold significantly increased the initial strength of rotator cuff repair by approximately 25%.
authors.affiliation: Department of Orthopaedic Surgery, Northwestern University Medical School, 645 North Michigan Avenue, Chicago, IL 60611, USA.
authors.forename: Jason L
authors.initials: JL
authors.lastname: Koh
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Szomor
authors.forename: George A C
authors.initials: GA
authors.lastname: Murrell
authors.forename: Russell F
authors.initials: RF
authors.lastname: Warren
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D006811:Humerus / Q000601:surgery; D019637:Orthopedic Procedures / Q000295:instrumentation* / Q000379:methods; D017006:Rotator Cuff / Q000601:surgery*; D012756:Sheep; D012782:Shoulder / Q000601:surgery*; D013536:Suture Techniques; D013710:Tendons / Q000601:surgery; D013718:Tensile Strength