The effect of femoral component rotation on the five-year outcome of cemented mobile bearing total knee arthroplasty.

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Serval ID
serval:BIB_63855C317BFC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The effect of femoral component rotation on the five-year outcome of cemented mobile bearing total knee arthroplasty.
Journal
International Orthopaedics
Author(s)
Rienmüller A., Guggi T., Gruber G., Preiss S., Drobny T.
ISSN
1432-5195 (Electronic)
ISSN-L
0341-2695
Publication state
Published
Issued date
2012
Volume
36
Number
10
Pages
2067-2072
Language
english
Notes
Publication types: Journal Article
Abstract
PURPOSE: Performing total knee replacement, accurate alignment and neutral rotation of the femoral component are widely believed to be crucial for the ultimate success. Contrary to absolute bone referenced alignment, using a ligament balancing technique does not automatically rotate the femoral component parallel to the transepicondylar axis. In this context we established the hypothesis that rotational alignment of the femoral component parallel to the transepicondylar axis (0° ± 3°) results in better outcome than alignment outside of this range.
METHODS: We analysed 204 primary cemented mobile bearing total knee replacements five years postoperatively. Femoral component rotation was measured on axial radiographs using the condylar twist angle (CTA). Knee society score, range of motion as well as subjective rating documented outcome.
RESULTS: In 96 knees the femoral component rotation was within the range 0 ± 3° (neutral rotation group), and in 108 knees the five-year postoperative rotational alignment of the femoral component was outside of this range (outlier group). Postoperative CTA showed a mean of 2.8° (±3.4°) internal rotation (IR) with a range between 6° external rotation (ER) and 15° IR (CI 95). No difference with regard to subjective and objective outcome could be detected.
CONCLUSION: The present work shows that there is a large given natural variability in optimal rotational orientation, in this study between 6° ER and 15° IR, with numerous co-factors determining correct positioning of the femoral component. Further studies substantiating pre- and postoperative determinants are required to complete the understanding of resulting biomechanics in primary TKA.
Pubmed
Web of science
Open Access
Yes
Create date
01/11/2012 18:33
Last modification date
01/10/2019 6:18
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