Document Detail


Total knees designed for normal kinematics evaluated in an up-and-down crouching machine.
MedLine Citation:
PMID:  19148937     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We constructed a crouching machine to study the motion of the knee joint, in which a motor was used to wind the quadriceps tendon so as to move the knee from high flexion to extension and back into flexion, while springs simulated hamstrings forces. Seven human cadaveric knees were tested intact and then after anterior cruciate ligament (ACL) resection. Motions of the femur, tibia, and patella were recorded by an optical tracking system. We then inserted plastic models representing commonly used total condylar and posterior stabilized knee replacement designs. Femoral motion was described by successive positions of the transverse axis of the femur projected onto the tibial surface. In the knee replacements, motions were similar to that of an ACL-deficient knee. We then tested two new designs with features intended to prevent anterior paradoxical sliding and to promote a medial pivot motion with femoral rollback primarily on the lateral side. The motion path more closely followed that of the normal intact knee. We concluded that motion guiding features in a total knee replacement could reproduce a normal neutral path that might result in functional improvements for the patient.
Authors:
Gokce Yildirim; Peter S Walker; Jason Boyer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  27     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-27     Completed Date:  2009-08-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1022-7     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.
Affiliation:
Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases, c/o Veterans Administration Medical Center, 423 East 23rd Street, Annex Building #2, Room 206A, New York, New York 10010, USA.
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MeSH Terms
Descriptor/Qualifier:
Anterior Cruciate Ligament / physiology,  surgery
Arthroplasty, Replacement, Knee / instrumentation*
Biomechanics
Cadaver
Diagnostic Techniques and Procedures / instrumentation
Equipment Design / methods
Femur / physiopathology
Humans
Knee Joint / physiopathology*
Patella / physiopathology
Tibia / physiopathology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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