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· DOS Abstracts
Does knee awareness differ between knees in bilateral
simultaneous TKA? Predictors of high knee awareness.
Katrine Abildgaard Nielsen, Morten Grove Thomsen, Roshan Latifi,
Thomas Kallemose, Henrik Husted, Anders Troelsen
Department of Orthopaedic Surgery, Copenhagen University Hospital
Hvidovre, Denmark
Background:
Low knee awareness during activities of daily living has become
the primary goal when evaluating outcome after Total Knee Arthroplasty (TKA).
However, it is still unclear how patient derived factors (e.g. knee alignment)
influence postoperative knee awareness and functional outcome. The Forgotten
Joint Score (FJS) evaluates to what extent the patient is aware of the artificial
knee and thereby, whether the knee feels natural or not.
Purpose / Aim of Study:
To evaluate knee awareness of patients undergoing
bilateral simultaneous TKA and to clarify the factors that predict a high or low
score.
Materials and Methods:
This cross sectional study was conducted on 120 si-
multaneous bilateral TKAs (cemented CR AGC, Biomet) performed at our insti-
tution between 2008 and 2012 (2-6 years follow-up). All patients received 1
set of questionnaires (FJS and Oxford Knee Score (OKS)) for each knee. 99 pa-
tients (45 men, 54 women, mean age at operation 66,6 years) completed the
survey and were eligible for analysis. Based on FJS scores patients’ knees were
divided into two groups - “best” and “worst” knees. The FJS and OKS scores
were compared between groups.
Findings / Results:
The absolute difference in FJS and OKS score between the
knees within each patient was calculated, a non-parametric bootstrap was used
to create a 95 % confidence interval (CI) for the median of these differences.
The results was a median of 1 (CI: 0-4) for the FJS score and 1 (CI: 0- 1) for the
OKS score. A predictive model found that KL-score (p=0.006) and preoperative
knee-alignment (p=0.017) had a significant effect on FJS score.
Conclusions:
Knee awareness and functional outcome did not differ signifi-
cantly between the best and worst knee in patients undergoing bilateral simul-
taneous TKA. More severe preoperative varus alignment and more severe KL-
grades predict lower knee awareness after TKA.
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