DOS Kongressen 2014 ·
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Does knee awareness differ between different TKA
designs? A matched, case-control, cross-sectional
study.
Morten Grove Thomsen, Roshan Latifi, Thomas Kallemose, Henrik Husted,
Anders Troelsen
Dept. of Orthopedic surgery, Copenhagen University Hospital of Hvidovre,
Denmark
Background:
Low knee awareness after TKA has become the ultimate goal in
trying to achieve a natural feeling knee that meet patient expectations. To ac-
commodate this manufacturers of TKAs have developed new prosthetic designs
that potentially could give patients a more natural feeling knee during activi-
ties.
Purpose / Aim of Study:
To compare the Forgotten Joint Score (FJS) and
Oxford Knee Score (OKS) of patients treated with a previous generation stan-
dard CR TKA to the scores obtained by patients treated with a newer generation
CR TKA or a mobile bearing CR TKA.
Materials and Methods:
We identified all patients receiving a new genera-
tion CR TKA or mobile bearing TKA at our institution between 2010 and 2012.
These were matched to a population of patients receiving a standard CR TKA re-
garding age, gender, year of surgery, KL- grade and pre- and postoperative knee
alignment. Patients were asked to complete the FJS and OKS questionnaires. Of
the 316 patients completing the survey 64 standard CR TKAs to 45 new gen-
eration CR TKAs and 121 standard CR TKAs to 68 mobile bearing TKAs were
matched. The FJS and OKS scores of the three TKA designs were compared.
Findings / Results:
When comparing the new generation CR TKAs to the
standard CR TKAs we found statistically significant higher OKS and FJS scores
(6 (p=0.04) and 16 (p=0.03) points respectively) for the new generation CR
TKAs. When comparing the mobile bearing TKAs to the standard CR TKAs we
found a statistically significant higher OKS score (3 points, p=0.04), and a higher
FJS score (4 points, p=0.48) for the mobile bearing TKAs.
Conclusions:
Patients receiving the new generation CR and mobile bearing CR
TKAs obtained higher FJS and OKS scores when compared to patients receiving
a standard CR TKA, indicating that the use of these newer prosthetic designs
facilitate less knee awareness and better function after TKA.
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