Evidence map›Paper›PMID 22105569›Full record

ArticleInternational orthopaedics2012

Polyethylene thickness is a risk factor for wear necessitating insert exchange.

Bart G Pijls, Henrica M J Van der Linden-Van der Zwaag, Rob G H H Nelissen

Open access · hybridAbstract read
In one paragraph

Article in International orthopaedics, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
1.2field-weighted citation impact, top 20% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

14 citing papers in PubMed, 41 citations in OpenAlex.

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  11. All-polyethylene tibial components are not inferior to metal-backed tibial components in long-term follow-up of knee arthroplasties.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2015
    Article
  12. Improved design decreases wear in total knee arthroplasty with varus malalignment.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2014
    Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

Bart G PijlsDepartment of Orthopaedics, Leiden University Medical Center, Albinusdreef 2, P.O. Box 9600, Postzone J-11-S, 2300 RC, Leiden, The Netherlands. b.g.c.w.pijls@lumc.nl
Henrica M J Van der Linden-Van der Zwaag
Rob G H H Nelissen
Leiden University Medical Center · NL

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe aim of this observational study was to investigate the optimal minimal polyethylene (PE) thickness in total knee arthroplasty (TKA) and identify other risk factors associated with revision of the insert due to wear.

methodsA total of 84 TKA were followed for 11-16 years. All patients received the same prosthesis design (Interax; Howmedica/ Stryker) with halfbearings: separate PE-inserts medially and laterally. Statistical analysis comprised Cox-regression to correct for confounding.

resultsEight knees (9.5%) had been revised due to thinning inserts and an additional patient is scheduled for revision. PE thickness, diagnosis, BMI and weight are risk factors for insert exchange. For each millimetre decrease in PE thickness, the risk of insert exchange increases 3.0 times, which remains after correction for age, gender, weight, diagnosis and femoral-tibial angle. Insert exchange was 4.73 times more likely in OA-patients compared to RA-patients. For every unit increase in BMI and weight the risk for insert exchange increases 1.40 times and 1.14 times, respectively.

conclusionsIn conclusion we therefore advise against the use of thin PE inserts in modular TKA and recommend PE inserts with a minimal 8-mm thickness.

Indexed as

PolyethyleneProsthesis DesignAdultAgedAged, 80 and overArthroplasty, Replacement, KneeContraindicationsFemaleHumansKnee ProsthesisMaleMiddle AgedProsthesis FailureReoperationRisk FactorsPolyethylene

Identifiers

PMID22105569
PMCPMC3353090
OpenAlexW2037802856

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.