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Purpose. To compare the biomechanical properties of 3 suture-bridge techniques for rotator cuff repair. Methods. Twelve pair-matched fresh-frozen shoulder specimens were randomized to 3 groups of different repair types: the medially Knotted Suture Bridge (KSB), the medially Untied Suture Bridge (USB), and the Modified Suture Bridge (MSB). Cyclic loading and load-to-failure test were performed. Parameters of elongation, stiffness, load at failure, and mode of failure were recorded. Results. The MSB technique had the significantly greatest load to failure (515.6±78.0 N, P=0.04 for KSB group; P<0.001 for USB group), stiffness (58.0±10.7 N/mm, P=0.005 for KSB group; P<0.001 for USB group), and lowest elongation (1.49±0.39 mm, P=0.009 for KSB group; P=0.001 for USB group) among 3 groups. The KSB repair had significantly higher ultimate load (443.5±65.0 N) than USB repair (363.5±52.3 N, P=0.024). However, there was no statistical difference in stiffness and elongation between KSB and USB technique (P=0.396 for stiffness and P=0.242 for elongation, resp.). The failure mode for all specimens was suture pulling through the cuff tendon. Conclusions. Our modified suture bridge technique (MSB) may provide enhanced biomechanical properties when compared with medially knotted or knotless repair. Clinical Relevance. Our modified technique may represent a promising alternative in arthroscopic rotator cuff repair.

Biomechanical Comparison of Modified Suture Bridge Using Rip-Stop versus Traditional Suture Bridge for Rotator Cuff Repair