caa a22 4500 605459770 CHVBK 20210128100235.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00167-013-2775-6 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2775-6 Biomechanical characterization of unicortical button fixation: a novel technique for proximal subpectoral biceps tenodesis [Elektronische Daten] [Joseph DeAngelis, Alvin Chen, Michael Wexler, Benjamin Hertz, Leandro Grimaldi Bournissaint, Ara Nazarian, Arun Ramappa] Purpose: Proximal biceps tenodesis is one method for treating biceps-related pain. Tenodesis protects the length-tension relationship of the biceps muscle, maintains strength, and provides a better cosmetic appearance than tenotomy. The purpose of this investigation was to compare the mechanical properties of a unicortical metal button and an interference screw in proximal biceps tenodesis. Methods: Six pairs of fresh-frozen shoulders were dissected, leaving the proximal biceps tendon as a free graft. On each pair of shoulders, a biceps tenodesis was performed using an interference screw or a unicortical metal button. The specimens were mounted and a cyclic load (10-60N) was applied at 1Hz for 200 cycles, followed by an axial load to failure. The displacement, ultimate load to failure, and mode of failure were recorded. Results: Displacement in response to cyclic loading was 3.7±2.2mm for the interference screw and 1.9±1.0mm for the cortical button (P=0.03). Load at failure for the interference screw was 191±64N (stiffness: 24±11N/mm) and 183±61N (stiffness: 24±7. N/mm) for the unicortical button (P=n.s. for both cases). Conclusions: As a novel technique for subpectoral biceps tenodesis, a unicortical button demonstrated significantly less displacement in response to cyclic loading than the interference screw. The ultimate load to failure and stiffness for the two methods were not different. In this way, a unicortical button may provide a reliable alternative method of fixation with a potentially lower risk of post-operative humeral fracture and a construct that permits early mobilization following biceps tenodesis. Springer-Verlag Berlin Heidelberg, 2013 Biceps tenodesis nationallicence Interference screw nationallicence Cortical button nationallicence Load to failure nationallicence Displacement nationallicence DeAngelis Joseph Carl J. Shapiro Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, MA, USA aut Chen Alvin Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut Wexler Michael Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut Hertz Benjamin Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut Grimaldi Bournissaint Leandro Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut Nazarian Ara Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut Ramappa Arun Carl J. Shapiro Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, MA, USA aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/5(2015-05-01), 1434-1441 0942-2056 23:5<1434 2015 23 167 https://doi.org/10.1007/s00167-013-2775-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-013-2775-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- DeAngelis Joseph Carl J. Shapiro Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, MA, USA aut NATIONALLICENCE 700 1- Chen Alvin Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut NATIONALLICENCE 700 1- Wexler Michael Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut NATIONALLICENCE 700 1- Hertz Benjamin Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut NATIONALLICENCE 700 1- Grimaldi Bournissaint Leandro Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut NATIONALLICENCE 700 1- Nazarian Ara Department of Orthopaedic Surgery, Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA aut NATIONALLICENCE 700 1- Ramappa Arun Carl J. Shapiro Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, MA, USA aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/5(2015-05-01), 1434-1441 0942-2056 23:5<1434 2015 23 167