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DOS Kongressen 2017 ·
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Similar and good fixation of cementless and cemented
Oxford® Partial Knee Tibial Trays at 5 years follow-up.
A Randomized RSA Study
Maiken Stilling, Anders Odgaard, Claus Fink Jepsen, Kjeld Søballe, Per Wagner
Kristensen, Frank Madsen
Department of Orthopaedics, Aarhus University Hospital; Department of Or-
thopaedics, Gentofte Hospital; Department of Orthopaedics, Aarhus University
Hospital; Department of Orthopaedics, Aarhus University Hospital; Department
of Orthopaedics, Vejle Hospital; Department of Orthopaedics, Aarhus University
Hospital
Background:
Cementless fixation of Oxford® Partial Knee Tibial Trays is gaining
in pass on the market and has promising results.
Purpose / Aim of Study:
To compare fixation of cementless and cemented
(gold standard) Oxford® Partial Knee TT up to 5 years follow-up.
Materials and Methods:
79 patients (48 men) were randomly allocated to
surgery with cementless (CL) hydroxyapatite-coated (n=25) or cemented (C)
(n=54) Oxford® Partial Knee tibial trays (Biomet) in a multicenter study. Femo-
ral components were either single-pegged or double-pegged in the cemented
group and double-pegged in the cementless group. Refobacin bone cement
(Biomet Inc.) was used. Evaluation of implant migration, and clinical outcomes
(OKS) was performed at 6 weeks, 3 and 6 months, and 1, 2, and 5 years.
Findings / Results:
CL migrated more than C at all follow-ups (p<0.01), how-
ever migration stabilized at 6 months follow-up. At 5 years CL (n=23) migrated
0.49mm (sd 0.34) and C (n=48) migrated 0.38mm (sd 0.63) mean total trans-
lation (p=0.01). 5 year subsidence was higher for CL compared to C (p=0.01).
Between 2 and 5 years CL migrated 0.09mm (sd 0.10) and C migrated 0.13mm
(sd 0.33) total translation (p=0.48). 16% of CL and 22% of C migrated more
than 0.2mm total translation between 2 and 5 years follow-up (p=0.55). At 5
years mean OKS was 39 (range 12-48) and similar between groups (p=0.47)
with comparable improvement from baseline (p=0.18). 91.6% with C and
94.1% with CL were satisfied with the result (p=0.91).
Conclusions:
Cementless Oxford® Partial Knee tibial trays migrated initially but
stabilized at 6 months probably due to osseointegration. Between 2 and 5 years
follow-up cementless fixation was as good as cemented fixation (gold stan-
dard). Functional results were good and satisfaction high and equivalent in both
groups.
No conflicts of interest reported
99.