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Rotational limb alignment changes following total knee arthroplasty
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Rotational limb alignment changes following total knee arthroplasty
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Journal Article
Rotational limb alignment changes following total knee arthroplasty
2013
Overview
Purpose
The aim of the present study was to assess the changes in rotational alignment introduced by total knee arthroplasty (TKA) and the reproducibility of pre- and postoperative CT measurements of rotational limb alignment.
Methods
For this purpose we analyzed data from 196 consecutive cruciate-retaining, fixed bearing Columbus TKA procedures. Both pre- and postoperative scans torsion difference CT scans were available for measurements in 89 cases. Using these CT scans the neck-malleolar angle (NMA), the femoral posterior condylar angle (fPCA), the tibial posterior condylar axis (tPCA) and the tibial torsion angle (TTA) were independently assessed by three raters. CT scans were re-evaluated 8 weeks later by the most experienced rater for assessment of intraobserver agreement.
Results
Measurements of all angles were prone to high standard deviations reflecting interindividual variability. Mean fPCA changed from 1.3° to 2.7° internal rotation preoperatively to 0.1°–1.9° internal rotation postoperatively. Based on a relative external rotation of the tibial base plate as compared to the preoperative situation, we found a relative internal rotation of the postoperative NMA and tibial torsion of 3°–5.4° and 6°–7.5°, respectively. Intra- and interobserver agreement was strong for all angles assessed (ICCs 0.7–1.0) except for fPCA (ICC 0.2–0.6). However, mean absolute measurement differences for fPCA were clinically acceptable (1.2°–2.6°).
Conclusions
Reproducibility of CT rotational limb alignment measurements was found to be clinically acceptable. Rotational alignment of the femoral and even more so of the tibial component will ultimately affect the rotational alignment of the entire limb—at least when fixed bearings are used.
Level of evidence
Diagnostic study, Level III.
Publisher
Springer Berlin Heidelberg,John Wiley & Sons, Inc
Subject
/ Arthroplasty, Replacement, Knee - instrumentation
/ Arthroplasty, Replacement, Knee - methods
/ Bone Anteversion - complications
/ Bone Anteversion - diagnostic imaging
/ Bone Malalignment - diagnostic imaging
/ Bone Malalignment - etiology
/ Bone Malalignment - prevention & control
/ Bone Retroversion - complications
/ Bone Retroversion - diagnostic imaging
/ Female
/ Humans
/ Knee
/ Knee Joint - diagnostic imaging
/ Knee Joint - physiopathology
/ Male
/ Medicine
/ Osteoarthritis, Knee - complications
/ Osteoarthritis, Knee - diagnostic imaging
/ Osteoarthritis, Knee - surgery
/ Postoperative Complications - diagnostic imaging
/ Postoperative Complications - prevention & control
/ Rotation
