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The Effect of Torque Differences for All-Suture Anchor Fixation Strength: A Biomechanical Analysis
Lucca Lacheta1,2,3, Jon Miles1, Brenton Douglass1
1Steadman Philippon Research Institute, Vail, Colorado, U.S.A.
Arthroscopy, Sports Medicine, and Rehabilitation
|May 24, 2021
Summary
Differential loading of suture strands in all-suture anchors impacts fixation strength. Knotless anchors showed similar ultimate loads to knotted ones with equal loading, but torque affected performance.
Area of Science:
- Orthopedic biomechanics
- Surgical device engineering
Background:
- All-suture anchors are widely used in orthopedic surgery for soft tissue fixation.
- Understanding the biomechanical factors influencing anchor performance is crucial for optimizing surgical outcomes.
Purpose of the Study:
- To investigate the biomechanical influence of differential suture strand loading (torque) on the fixation strength of knotted and knotless all-suture anchors.
Main Methods:
- Evaluated the biomechanical strength of 48 all-suture anchors in polyurethane foam blocks under four conditions: proportionate loading, partial torque, full torque, and knotless anchors.
- Assessed forces at 1 mm and 2 mm displacement and ultimate failure load.
Main Results:
- Differential loading (torque) significantly reduced initial fixation strength at 1 mm and 2 mm displacement compared to proportionate loading.
- Knotless anchors and equally loaded knotted anchors showed similar ultimate failure loads.
- Full torque significantly reduced the ultimate failure load compared to all other groups.
Conclusions:
- Suture strand loading differentials partially affect all-suture anchor fixation strength.
- Knotless anchors demonstrate comparable ultimate failure loads to equally loaded knotted anchors.
- Clinical consideration of suture loading imbalance is essential for successful repair construct fixation.
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