Triple-Loaded Suture Anchors Versus a Knotless Rip Stop Construct in a Single-Row Rotator Cuff Repair Model

Purpose: To compare the biomechanical properties of single-row repair with triple-loaded )TL) anchor repair versus a knotless rip stop (KRS) repair in a rotator cuff repair model. Methods: Rotator cuff tears were created in 8 cadaveric matched-pair specimens and repaired with a TL anchor or KRS construct. In the TL construct, anchors were placed in the greater tuberosity and then all suture limbs were passed through the rotator cuff as simple sutures and tied. In the KRS construct, a 2-mm suture tape was passed through the tendon in an inverted mattress fashion, and a free suture was passed medial to the suture tape to create a rip-stop. Then, the suture tape and free suture were secured with knotless anchors. Displacement was observed with video tracking after cyclic loading, and specimens were loaded to failure. Results: The mean load to failure was 438 +/- 59 N in TL anchor repairs compared with 457 +/- 110 N in KRS repairs (P = .582). The mean displacement with cyclic loading was 3.8 +/- 1.6 mm in TL anchor repairs versus 4.3 +/- 1.8 mm in the KRS group (P = .297). Mode of failure was consistent in both groups, with 6 of 8 failures in the TL anchor group and 7 of 8 failures in KRS group occurring from anchor pullout. Conclusions: There is no statistical difference in load to failure and cyclic loading between TL anchor and KRS single-row repair techniques.