Document Detail

Kinematic evaluation of cruciate-retaining total knee replacement patients during level walking: a comparison with the displacement-controlled ISO standard.
MedLine Citation:
PMID:  19651410     Owner:  NLM     Status:  MEDLINE    
Differences between wear-scar features of simulator-tested and retrieved tibial total knee replacement (TKR) liners have been reported. This disagreement may result from differences between in vivo kinematic profiles and those defined by the International Organization for Standardization (ISO). The purpose of this study was to determine the knee kinematics of a TKR subject group during level walking and compare them with the motion profiles defined by the ISO standard for a displacement-controlled knee wear testing simulator. Twenty-nine patients with a posterior cruciate ligament-retaining TKR design were gait tested using the point cluster technique to obtain flexion-extension (FE) rotation, anterior-posterior (AP) translation and internal-external (IE) rotation knee motions during a complete cycle of level walking. Relative ranges of motion and timing of key points within the in vivo motion data were compared against the same ranges and same key points from the input profiles of the displacement-controlled wear testing standard ISO14243-3. The subjects exhibited a FE pattern similar to ISO, with an insignificant difference in range of FE rotation from midstance to terminal stance. However, the subjects had a significantly higher range of knee flexion from terminal stance into swing. The subjects also exhibited a phase delay for the entire gait cycle. For AP translation, the standard profile had statistically significant lower magnitudes than seen in vivo. Opposite pattern of AP motion was also apparent from midstance and swing. Similarly, ISO specified a smaller IE total range of rotation with a motion pattern in complete opposition to that seen in vivo. In conclusion, significant differences were found in both the magnitudes and pattern of in vivo motion compared with ISO.
Valentina Ngai; Markus A Wimmer
Publication Detail:
Type:  Controlled Clinical Trial; Journal Article; Research Support, N.I.H., Extramural     Date:  2009-08-03
Journal Detail:
Title:  Journal of biomechanics     Volume:  42     ISSN:  1873-2380     ISO Abbreviation:  J Biomech     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-05     Completed Date:  2010-01-04     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2363-8     Citation Subset:  IM    
Rush University Medical Center, Department of Orthopedic Surgery, Chicago, IL, USA.
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MeSH Terms
Anterior Cruciate Ligament / physiopathology*
Computer Simulation
Equipment Failure Analysis / standards*
Knee Joint / physiopathology*,  surgery
Knee Prosthesis*
Middle Aged
Models, Biological*
Range of Motion, Articular*
Reference Standards
Reproducibility of Results
Sensitivity and Specificity
Grant Support
R01 AR059843/AR/NIAMS NIH HHS; R03 AR052039/AR/NIAMS NIH HHS; R03 AR052039/AR/NIAMS NIH HHS; R03 AR052039-01A1/AR/NIAMS NIH HHS; R03 AR052039-02/AR/NIAMS NIH HHS; R03 AR052039-03/AR/NIAMS NIH HHS

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

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