Flexion-extension gap in cruciate-retaining versus posterior-stabilized total knee arthroplasty: A cadaveric study

ABSTRACT We re‐examined experimental model results using half‐body specimens with intact extensor mechanisms and navigation to evaluate cruciate‐retaining (CR) and posterior stabilized (PS) total knee arthroplasty (TKA) component gaps through an entire range of motion. Six sequential testing regimen...

Full description

Saved in:
Bibliographic Details
Published in:Journal of orthopaedic research 2014-05, Vol.32 (5), p.627-632
Main Authors: Matthews, Joshua, Chong, Alexander, McQueen, David, O'Guinn, Justin, Wooley, Paul
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Arthroplasty, Replacement, Knee - methods
Biomechanical Phenomena
Cadaver
cruciate retaining
Female
flexion-extension gap
Humans
Knee Joint - anatomy & histology
Knee Joint - surgery
Male
Middle Aged
Posterior Cruciate Ligament - surgery
posterior stabilized
Range of Motion, Articular
total knee arthroplasty
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT We re‐examined experimental model results using half‐body specimens with intact extensor mechanisms and navigation to evaluate cruciate‐retaining (CR) and posterior stabilized (PS) total knee arthroplasty (TKA) component gaps through an entire range of motion. Six sequential testing regimens were conducted with the knee intact, with a CR TKA in place, and with a PS TKA in place, with and without 22 N traction in place at each stage. Each of 10 knees was taken through six full ranges of motion from 0° to 120° at every stage using a navigated knee system to record component gapping. No significant difference was found between loaded and unloaded component gaps, and no significant differences were found in component gapping between CR and PS TKAs throughout a full range of motion. Flexion–extension gap measurements were significantly different from previously published data (at 90° flexion). No difference was found in kinematics when comparing CR and PS TKA component designs. Our results suggest that intact extensor mechanisms may be required to perform proper kinematic studies of TKA. Our findings provide evidence that the extensor mechanism may play a major role in the flexion–extension gaps in cadaveric knees. © 2014 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 32:627–632, 2014.
ISSN:0736-0266
1554-527X
DOI:10.1002/jor.22587