Evidence map›Paper›PMID 26454451›Full record

ArticleSkeletal radiology2016

No association between pseudotumors, high serum metal-ion levels and metal hypersensitivity in large-head metal-on-metal total hip arthroplasty at 5-7-year follow-up.

Mette Holm Hjorth, Maiken Stilling, Kjeld Soballe, Lars Hans Bolvig, Jacob Pontoppidan Thyssen, Inger Mechlenburg, Stig Storgaard Jakobsen

Abstract read
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In one paragraph

Article in Skeletal radiology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed, 1 pooled it
5.9field-weighted citation impact, top 4% 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

13 citing papers in PubMed, 1 synthesis or guideline pooled it, 33 citations in OpenAlex.

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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

7 authors at 2 institutions in 1 country.

Mette Holm HjorthDepartment of Orthopaedics, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. mettehh20@gmail.com.
Maiken StillingDepartment of Orthopaedics, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. maiken.stilling@ki.au.dk.
Kjeld SoballeDepartment of Orthopaedics, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. kjeld@soballe.com.
Lars Hans BolvigDepartment of Radiology, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. larshans@rm.dk.
Jacob Pontoppidan ThyssenDepartment of Dermato-Allergology, Gentofte Hospital, University of Copenhagen, Hellerup, Copenhagen, Denmark. jacob.p.thyssen@regionh.dk.
Inger MechlenburgDepartment of Orthopaedics, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. inger.mechlenburg@ki.au.dk.
Stig Storgaard JakobsenDepartment of Orthopaedics, Aarhus University Hospital, Tage-Hansens Gade 2, 8000, Aarhus C, Denmark. stig.jakobsen@ki.au.dk.
Aarhus University Hospital · DKUniversity of Copenhagen · DK

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveThe relationship between metal wear debris, pseudotumor formation and metal hypersensitivity is complex and not completely understood. The purpose of this study was to assess the prevalence of pseudotumor formation in a consecutive series of metal-on-metal (MoM) total hip arthroplasty (THA) and to investigate its relationship to serum metal-ion levels and hypersensitivity to metal.

methodsForty-one patients (31 males), mean age 52 (28-68) years, with a total of 49 large-head MoM THA participated in a 5-7-year follow-up study. Patients underwent ultrasonography, serum metal-ion concentrations were measured, metal allergy and atopic dermatitis were evaluated, and the questionnaires of the Oxford Hip Score (OHS), Harris Hip Score (HHS) and the Short-Form Health Survey (SF-36) were completed.

resultsPseudotumors were found in eight patients, but they were asymptomatic and their serum metal-ion levels were similar to those observed in patients with no pseudotumors (p > 0.36). The capsule-stem distance of mean 8.6 mm (SD 3.82, 95% CI: 5.40-11.79) was wider (p = 0.02) in patients with pseudotumours than in patients without pseudotumors of mean 5.6 mm (SD 2.89, 95% CI: 4.68-6.58). Positive patch test reactions were seen in three patients. Higher serum metal-ion levels of chromium and cobalt were significantly correlated with steeper cup inclination and smaller femoral head sizes, and were associated with female gender (p < 0.04).

conclusionWe found no association between pseudotumor formation, serum metal-ion levels, metal patch test reactivity, and atopic dermatitis. However, clinicians should be aware of asymptomatic pseudotumors, and we advise further exploration into the mechanisms involved in the pathogenesis of pseudotumors.

Indexed as

AdultAgedArthroplasty, Replacement, HipCausalityComorbidityDenmarkFemaleFollow-Up StudiesGranuloma, Plasma CellHip ProsthesisHumansHypersensitivityIonsLongitudinal StudiesMaleMetal-on-Metal Joint ProsthesesIonsMetalsLarge-head MoM THAMetal hypersensitivityPseudotumorSerum metal-ion levelsUltrasonography

Identifiers

PMID26454451
OpenAlexW1819982052

What OpenQuestion holds

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Registered trials

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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.