| Total knee replacement with natural roll back. | |
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MedLine Citation:
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PMID: 21493053 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A novel class of total knee replacement (AEQUOS G1) is introduced which features a unique design of the articular surfaces. Based on the anatomy of the human knee and differing from all other prostheses, the lateral tibial "plateau" is convexly curved and the lateral femoral condyle is posteriorly shifted in relation to the medial femoral condyle. Under compressive forces the configuration of the articular surfaces of human knees constrains the relative motion of femur and tibia in flexion/extension. This constrained motion is equivalent to that of a four-bar linkage, the virtual 4 pivots of which are given by the centres of curvature of the articulating surfaces. The dimensions of the four-bar linkage were optimized to the effect that constrained motion of the total knee replacement (TKR) follows the flexional motion of the human knee in close approximation, particularly during gait. In pilot studies lateral X-ray pictures have demonstrated that AEQUOS G1 can feature the natural roll back in vivo. Roll back relieves the load of the patello-femoral joint and minimizes retropatellar pressure. This mechanism should reduce the prevalence of anterior knee pain. The articulating surfaces roll predominantly in the stance phase. Consequently sliding friction is replaced by the lesser rolling friction under load. Producing roll back should minimize material wear due to friction and maximize the lifetime of the prosthesis. To definitely confirm these theses one has to wait for the long term results. |
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Authors:
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Martin Michael Wachowski; Tim Alexander Walde; Peter Balcarek; Jan Philipp Schüttrumpf; Stephan Frosch; Caspar Stauffenberg; Karl-Heinz Frosch; Christoph Fiedler; Jochen Fanghänel; Dietmar Kubein-Meesenburg; Hans Nägerl |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-17 |
Journal Detail:
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Title: Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft Volume: - ISSN: 1618-0402 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-4-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100963897 Medline TA: Ann Anat Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier GmbH. All rights reserved. |
Affiliation:
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Department of Trauma Surgery, Plastic and Reconstructive Surgery, Georg August University of Göttingen, D-37099 Göttingen, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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