title: Tendon-bone interface motion in transosseous suture and suture anchor rotator cuff repair techniques.
abstract: BACKGROUND
  Although many studies involving rotator cuff repair fixation have focused on ultimate fixation strength and ability to restore the tendon's native footprint, no studies have characterized the stability of the repair with regard to motion between the tendon and repair site footprint.
  
  
  OBJECTIVE
  Suture anchor fixation for rotator cuff repair has greater interface motion between tendon and bone than does transosseous suture fixation.
  
  
  METHODS
  Controlled laboratory study.
  
  
  METHODS
  Twelve fresh-frozen human cadaveric shoulders were tested in a custom device to position the shoulder in internal and external rotations with simulated supraspinatus muscle loading. Tendon motion relative to the insertional footprint on the greater tuberosity was determined optically using a digital camera rigidly connected to the humerus, with the humerus positioned at 60 degrees of internal rotation and 60 degrees of external rotation. Testing was performed for the intact tendon, a complete supraspinatus tear, a suture anchor repair, and a transosseous tunnel repair.
  
  
  RESULTS
  Difference in tendon-bone interface motion when compared with the intact tendon was 7.14 +/- 3.72 mm for the torn rotator cuff condition, 2.35 +/- 1.26 mm for the suture anchor repair, and 0.02 +/- 1.18 mm for the transosseous suture repair. The transosseous suture repair demonstrated significantly less motion when compared with the torn rotator cuff and suture anchor repair conditions (P < .05).
  
  
  CONCLUSIONS
  Transosseous suture repair compared with suture anchor repair demonstrated superior tendon fixation with reduced motion at the tendon-to-tuberosity interface.
  
  
  CONCLUSIONS
  Development of new fixation techniques for arthroscopic and open rotator cuff repairs should attempt to minimize interface motion of the tendon relative to the tuberosity.
authors.affiliation: Center for Shoulder, Elbow, and Sports Medicine, Department of Orthopaedic Surgery, Columbia University, 622 West 168th Street, PH 11th Floor, New York, New York 10032, USA. CSA4@columbia.edu
authors.forename: Christopher S
authors.initials: CS
authors.lastname: Ahmad
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Stewart
authors.forename: Rolando
authors.initials: R
authors.lastname: Izquierdo
authors.forename: Louis U
authors.initials: LU
authors.lastname: Bigliani
mesh_terms: D001182:Arthroscopy / Q000379:methods; D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D016059:Range of Motion, Articular; D017006:Rotator Cuff / Q000601:surgery*; D000070636:Rotator Cuff Injuries; D012785:Shoulder Joint / Q000473:pathology / Q000601:surgery; D013536:Suture Techniques; D016896:Treatment Outcome