Voellner, Florian and Pilsl, Ulrike and Craiovan, Benjamin and Zeman, Florian and Schneider, Michael and Woerner, Michael and Grifka, Joachim and Weber, Markus (2017) Stability of knee ligament complex of Thiel-embalmed cadaver compared to in vivo knee. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, 71. pp. 392-396. ISSN 1751-6161, 1878-0180
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Background: The first biomechanical evaluation of new implants is usually carried out with cadavers. Fixation of Thiel-embalmed cadavers is supposed to preserve the histological structure, colour and consistency of the tissue and has a low risk of infection and toxicity. However, the biomechanical properties of Thiel-fixated tissue are still unknown. The aim of this study was to quantify the effect of the Thiel-embalming method on the elastic properties of the ligament complex of the knee compared to in vivo knees during total knee arthroplasty. Methods: The results of biomechanical tensile tests with 10 Thiel-embalmed knees were compared with the findings of 10 patients who underwent total knee arthroplasty with a standardised knee balancer at our department. We reconstructed the force-elongation curves of the medial and lateral ligament complex and calculated the stiffness in direct correlation with overall soft tissue stability in full extension and in 90 degrees of flexion. Results: All curves consisted of a non-linear part at the beginning and a linear part from about 80 N onwards. In full extension, median stiffness in the cadavers was 26.6 N/mm for the medial compartment and 31.6 N/mm for the lateral compartment. The values for in vivo were 25.7 N/mm for the medial compartment and 25.3 N/mm for the lateral compartment (p = 0.684 for the medial compartment and p = 0.247 for the lateral compartment). In 90 degrees of flexion, median stiffness in the cadaver group was 24.7 N/mm for the medial compartment and 22.2 N/mm for the lateral compartment. In vivo, median stiffness was 30.3 N/mm for the medial compartment and 29.2 N/mm for the lateral compartment (p = 0.009 for the medial compartment and p = 0.143 for the lateral compartment). Conclusion: Stiffness of the medial and lateral ligament complex in the knee was comparable between Thiel-embalmed cadavers and in vivo patients during total knee arthroplasty. Thiel fixation seems to preserve the soft tissue properties similar to those in vivo.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PRESERVATION; BIOMECHANICS; ALIGNMENT; TENDONS; DENSITY; In vivo - in vitro; Ligament balance; Ligament stiffness; Soft-tissue balance; Thiel-embalmed cadavers; Total knee arthroplasty |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Chirurgie Medicine > Lehrstuhl für Orthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 18 Feb 2019 11:51 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1654 |
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