Endurance Behavior of Cemented Tibial Tray Fixation Under Anterior Shear and Internal-External Torsional Shear Testing: A New Methodological Approach

Grupp, Thomas M.; Schilling, Christoph; Fritz, Bernhard; Reyna, Ana Laura Puente; Rusch, Sabine; Taunt, Charles und Mihalko, William M. (2022): Endurance Behavior of Cemented Tibial Tray Fixation Under Anterior Shear and Internal-External Torsional Shear Testing: A New Methodological Approach. In: Journal of Arthroplasty, Bd. 37, Nr. 11: S. 2272-2281

Abstract

Background: Early total knee arthroplasty failures continue to surface in the literature. Cementation technique and implant design are two of the most important scenarios that can affect implant survi-vorship. Our objectives were to develop a more suitable preclinical test to evaluate the endurance of the implant-cement-bone interface under anterior shear and internal-external (I/E) torsional shear testing condition in a biomechanical sawbones. Methods: Implants tested included the AS VEGA System PS and the AS Columbus CR/PS (Aesculap AG, Germany), with zirconium nitride (ZrN) coating. Tibial implants were evaluated under anterior shear and I/E torsional shear conditions with 6 samples in 4 test groups. For the evaluation of the I/E torsional shear endurance behavior, a test setup was created allowing for clinically relevant I/E rotation with simulta-neous high axial/tibio-femoral load. The test was performed with an I/E displacement of +/- 17.2 degrees, for 1 million cycles with an axial preload of 3,000 N.Results: After the anterior shear test an implant-cement-bone fixation strength for the AS VEGA System tibial tray of 2,674 +/- 754 N and for the AS Columbus CR/PS tibial tray of 2,177 +/- 429 N was determined (P = .191). After I/E rotational shear testing an implant-cement-bone fixation strength for the AS VEGA System PS tray of 2,561 +/- 519 N and for the AS Columbus CR/PS tray of 2,824 +/- 515 N was resulted (P = .39).Conclusion: Both methods had varying degrees of failure modes from debonding to failure of the sawbones foam. These two intense biomechanical loading tests are more strenuous and more repre-sentative of clinical activity.(c) 2022 Elsevier Inc. All rights reserved.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0883-5403
• Sprache: Englisch