Knotless single-row rotator cuff repair: a comparative biomechanical study of 2 knotless suture anchors.
The purpose of this study was to compare the gap formation during cyclic loading, maximum repair strength, and failure mode of single-row full-thickness supraspinatus repairs performed using 2 knotless suture anchors with differing internal suture-retention mechanisms in a human cadaver model. Nine matched pairs of cadaver shoulders were used. Full-thickness tears were induced by detaching the supraspinatus tendon from the greater tuberosity. Single-row repairs were performed with either type I (Opus Magnum PI; ArthroCare, Austin, Texas) or type II (ReelX STT; Stryker, Mahwah, New Jersey) knotless suture anchors. The repaired tendon was cycled from 10 to 90 N for 500 cycles, followed by load to failure. Gap formation was measured at 5, 100, 200, 300, 400, and 500 cycles with a video digitizing system. Anchor type or location (anterior or posterior) had no effect on gap formation during cyclic loading regardless of position (anterior, P=.385; posterior, P=.389). Maximum load to failure was significantly greater (P=.018) for repairs performed with type II anchors (288±62 N) compared with type I anchors (179±39 N). Primary failure modes were anchor pullout and tendon tearing for type II anchors and suture slippage through the anchor for type I anchors. The internal ratcheting suture-retention mechanism of type II anchors may have helped this anchor outperform the suture-cinching mechanism of type I anchors by supporting significantly higher loads before failure and minimizing suture slippage, potentially leading to stronger repairs clinically.
Chad
C
Efird
Shaun
S
Traub
Todd
T
Baldini
Dana
D
Rioux-Forker
Jeffrey P
JP
Spalazzi
Twana
T
Davisson
Monica
M
Hawkins
Eric
E
McCarty
D000368:Aged; D002102:Cadaver; D055119:Elastic Modulus; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D017006:Rotator Cuff / Q000503:physiopathology / Q000601:surgery; D000070636:Rotator Cuff Injuries; D013314:Stress, Mechanical; D053441:Suture Anchors; D013536:Suture Techniques / Q000295:instrumentation*; D013718:Tensile Strength