Einfluß des PE-Inlay-Überstandes auf das Outcome bei der primären Knieendoprothetik: Kurzfristige Ergebnisse einer retrospektiven Studie
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Philipps-Universität Marburg
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Abstract
Knee joint endoprosthesis is a relatively safe and
successful treatment option for advanced osteoarthritis of
the knee. In most of the commercially available
prosthesis models, the size of the PE inlay depends on the
size of the tibial component. However, there are some
models where the size of the inlay is based on the size of
the femoral component in order to optimize the surface
contact. However, it is possible that the implanted
femoral component is larger than the tibial component.
As a result of this mismatch, there can be a so-called
polyethylene overhang over the metallic, tibial
component. The overhang of the metallic components
and their oversizing has been researched to a great extent
in the literature. The effects of a polyethylene overhang
on the functional outcome and the radiological
measurements have not yet been investigated.
In a retrospective study, a total of 124 patients (or 135
knee joints) were examined from August 2018 to
February 2019. They all were treated surgically with a
primary total knee endoprosthesis (Gemini type SL PS -
fixed bearing, cemented- from Link) for symptomatic
osteoarthritis of the knee. The mean follow up was 16
months. The same surgical technique, the same prosthesis
model and the same follow-up treatment scheme were
always used. No patient was openly operated before or
after surgery (exclusion criterion). The patients were
divided into two groups. A total of 68 knee joints are
assigned to the first group, in which the femoral
component and consequently the polyethylene inlay were
the same size or smaller than the tibial component (non134
mismatch group). The second group included 67 knee
joints in which the femoral component and the inlay were
larger than the tibial component (mismatch group). All
patients were called in, informed about the study,
clinically examined personally by the author and the
Knee Society Score was recorded. In addition,
standardized x-rays were taken and the implant seat
evaluated according to the Knee Society
Roentgenographic Evaluation and Scoring System
criteria.
The data collected in this way were statistically
evaluated. Two analyzes were carried out; the original
analysis as well as a so-called sensitivity analysis,
whereby all patients were excluded who had been
operated on both sides in order to exclude person-specific
factors.
As the corresponding statistical tests showed, two groups
were formed that were homogeneous in terms of age,
weight and duration of the follow-up examination.
The evaluation of the clinical scores showed no
significant differences in the Knee Society Score total
score, the Knee Society Score - knee score or the Knee
Society Score - functional score in both groups.
The original analysis of the radiological scores also
showed no significant differences; In the sensitivity
analysis, a significant difference was only found for
the a.p. Femoral angle determined.
Regarding retropatellar replacement, a significant
difference between the two groups was also found in the
original analysis alone (which, however, could no longer
be found in the sensitivity analysis). The sole criterion
for performing a retropatellar replacement in the patients
examined was, however, the destruction of
the retropatellar articular surface.
A significant difference in gender distribution was found;
there were significantly more women in the mismatch
group than in the non-mismatch group.
All of these results are well compatible with the current
scientific literature. However, this study has the
weaknesses of a retrospective study. Further prospective
studies are necessary to confirm or refute the hypotheses
presented here.
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Dates
Created: 2021Issued: 2022-01-20Updated: 2022-01-20
Faculty
Medizin
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
PE inlay overhang outcome primary Knee Arthroplastyknee society scoreEinfluß PE Inlay Überhang auf radiologische und klinische Scores
DFG-subjects
KnieendoprothetikEinfluß auf Knee Society ScoreInlay PE Überhang
DDC-Numbers
610
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Orfanos, Georgios: Einfluß des PE-Inlay-Überstandes auf das Outcome bei der primären Knieendoprothetik: Kurzfristige Ergebnisse einer retrospektiven Studie. : Philipps-Universität Marburg 2022-01-20. DOI: https://doi.org/10.17192/z2022.0013.
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This item has been published with the following license: In Copyright