Evidence map›Paper›PMID 29693238›Full record

ArticleEuropean journal of orthopaedic surgery & traumatology : orthopedie traumatologie2018

Stability of L-shaped and inverted triangle fixation assemblies in treating Pauwels type II femoral neck fracture: a comparative mechanical study.

Vincenzo Giordano, Roger Pletsch Paes, Danilo Diniz Alves, Arthur Bonfim Amaral, William D Belangero, Marcos Giordano, Anderson Freitas, Hilton A Koch

Abstract readComparative Study
PubMed Publisher
In one paragraph

Article in European journal of orthopaedic surgery & traumatology : orthopedie traumatologie, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
–field-weighted citation impact
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

17 citing papers in PubMed.

  1. Article
  2. Review
  3. Fatigue testing of a self-compression screw model in Pauwels III fracture: an in vitro analysis.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2025
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  15. High incidence of "in-out-in" posterosuperior screws after cannulated screw fixation of femoral neck fractures.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2020
    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

8 authors.

Vincenzo GiordanoServiço de Ortopedia E Traumatologia Prof. Nova Monteiro, Hospital Municipal Miguel Couto, Clínica São Vicente, Rua João Borges 204, Gávea, Rio de Janeiro, RJ, 22451-100, Brazil. v_giordano@me.com.ORCID http://orcid.org/0000-0002-4429-312X
Roger Pletsch PaesServiço de Ortopedia E Traumatologia Prof. Nova Monteiro, Hospital Municipal Miguel Couto, Clínica São Vicente, Rua João Borges 204, Gávea, Rio de Janeiro, RJ, 22451-100, Brazil.
Danilo Diniz AlvesServiço de Ortopedia E Traumatologia Prof. Nova Monteiro, Hospital Municipal Miguel Couto, Clínica São Vicente, Rua João Borges 204, Gávea, Rio de Janeiro, RJ, 22451-100, Brazil.
Arthur Bonfim AmaralServiço de Ortopedia E Traumatologia Prof. Nova Monteiro, Hospital Municipal Miguel Couto, Clínica São Vicente, Rua João Borges 204, Gávea, Rio de Janeiro, RJ, 22451-100, Brazil.
William D BelangeroDepartamento de Ortopedia e Traumatologia, Universidade Estadual de Campinas, Campinas, Brazil.
Marcos GiordanoServiço de Traumato-Ortopedia, Hospital de Força Aérea do Galeão, Rio de Janeiro, Brazil.
Anderson FreitasServiço de Quadril - Hospital Ortopédico e Medicina Especializada - HOME, Brasília, Brazil.
Hilton A KochDepartamento de Radiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe aim of our study is to compare the mechanical resistance of two screw configurations in fixating type II Pauwels femoral neck fractures.

methodsFifteen synthetic models of femur bones in young adults were divided into three equal groups: intact (G1), models with fixation of a 5.0-mm failure zone created in the posterior cortex of the femoral neck using an L-shaped screw arrangement (G2, n = 5), and models with an identical failure zone fixated using an inverted triangle assembly (G3, n = 5). Model strength (axial loading) and rotational deviation of the fragments were load-tested until a 5.0-mm displacement was reached (step 1) and then until failure, here considered as 10.0 mm displacement in G2 and G3 or femoral neck fracture in G1 (step 2).

resultsIn step 1, the mean resistance in G1 was 1593 N (standard deviation [SD] of 62 N); this value in G2 was 1261 N (SD 49 N) and in G3 was 1074 N (SD 153 N). During step 2, the value for G1 was 2247 N (SD 84 N), for G2 was 1895 N (SD 69 N), and for G3 was 1523 N (SD 280 N). G3 (the inverted triangle assembly) showed a significantly lower maximum load than the group using the L-shaped assembly (G2) and the control group (G1), which was significant using Kruskal-Wallis analysis of variance (p = 0.002).

conclusionUnder test conditions in synthetic bone, fixation using a L-shaped screw assembly provides greater mechanical resistance than an inverted triangle assembly.

Indexed as

Bone ScrewsAdultBiomechanical PhenomenaFemoral Neck FracturesFemurFracture Fixation, InternalHumansMechanical PhenomenaModels, AnatomicYoung AdultAnalysis of equipment failureBone screwsFemoral neckHip fracturesInternal fracture fixationL shapedL-shaped assemblyMechanical torsion

Identifiers

PMID29693238

What OpenQuestion holds

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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.