DOS Kongressen 2014 ·
155
Does knee awareness and functional outcome
differ between knees of bilateral simultaneous
total knee arthroplasty (BSTKA) and unilateral
total knee arthroplasty (UTKA)? A cross-sectional,
matched, case control study.
Roshan Latifi, Morten G. Thomsen, Thomas Kallemose, Henrik Husted,
Anders Troelsen
Orthopaedic Surgery, Copenhagen University Hospital Hvidovre
Background:
Considerable controversy exists regarding the practice of BSTKA
compared with UTKA. Published studies have primarily focused on perioperative
complications, short-term outcome and mortality, whereas publications com-
paring longer term functional outcome and knee awareness between BSTKA
and UTKA are lacking.
Purpose / Aim of Study:
To compare the knee awareness (Forgotten Joint
Score–FJS) and functional scores (Oxford Knee Score–OKS) of patients treated
with BSTKA compared with UTKA, thereby to assess if BSTKA knees obtain a
result different from that of UTKA knees.
Materials and Methods:
Through database search we identified 69 patients
receiving BSTKA and 240 randomly selected patients receiving UTKA at our
institution between 2010 and 2012.The mean follow up time was 3.2 years.
All patients were asked to complete the FJS and OKS questionnaires. 210 of
UTKA patients and 65 of BSTKA patients completed the survey.Patients were
matched regarding age, gender, year of surgery, KL-score, pre- and postopera-
tive knee alignment leaving a study cohort of 94 knees in 47 patients in the
BSTKA and 94 knees in 94 patients in the UTKA group.The FJS and OKS scores
of the two groups were then compared.All TKAs were cemented and cruciate
retaining (AGC, Biomet).
Findings / Results:
The mean value of the OKS score in BSTKA and UTKA were
37.6(SD: 9.0) and 36.1(SD: 9.9) respectively. The mean value of FJS score in
BSTKA and UTKA were 59.9(SD: 27.5) and 57.5(SD: 28.8) respectively. Mixed-
effect models were used to evaluate the difference between BSTKA and UTKA,
giving a mean difference of 2.3(p- value=0.59) and 1.5(p-value=0.22) in FJS
and OKS scores respectively.
Conclusions:
Patients undergoing BSTKA have similar knee function and knee
awareness compared with patients undergoing UTKA. Our results support the
use of BSTKA in patients suffering from bilateral osteoarthritis.
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