Biomechanical properties of suprapectoral biceps tenodesis: double knotless screw fixation is superior to single knotless screw fixation

Archives of Orthopaedic and Trauma Surgery
Chih-Kai HongWei-Ren Su

Abstract

The purpose of this study is to biomechanically evaluate a new technique of double knotless screw fixation for suprapectoral biceps tenodesis and compare the results with that of the single knotless screw fixation as well as the interference screw fixation. 24 fresh-frozen human cadaveric shoulders with a mean age of 68.3 ± 9 years were studied. The specimens were randomly divided into three experimental biceps tenodesis groups (n = 8): single knotless screw, double knotless screw and interference screw. Each tenodesis specimen was mounted on a mechanical testing machine, preloaded for 2 min at 5 N, tested with cyclic loading from 5 to 70 N for 500 load cycles and subjected to an axial load to failure test (1 mm/s). The ultimate failure load, stiffness, cyclic displacement and mode of failure were evaluated. The interference screw fixation had the highest ultimate failure load (215.8 ± 43.1 N) and stiffness (25.7 ± 5.2 N/mm) which were significantly higher than the corresponding results for the single and double knotless screw groups (P = 0.0029). The double knotless screw group had the second highest ultimate failure load (162.8 ± 13.8 N) and stiffness (15.1 ± 4.1 N/mm) which were significantly higher than the corresponding re...Continue Reading

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Citations

Feb 7, 2019·Archives of Orthopaedic and Trauma Surgery·Martin HufelandThilo Patzer
Jan 14, 2020·Orthopedics·Miguel DiazUma Srikumaran

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