Evidence map›Paper›PMID 33842992›Full record

ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2021

Accuracy and reliability of the AO Spine subaxial cervical spine classification system grading subaxial cervical facet injury morphology.

Juan P Cabrera, Ratko Yurac, Alfredo Guiroy, Andrei F Joaquim, Charles A Carazzo, Juan J Zamorano, Kevin P White, Marcelo Valacco, AO Spine Latin America Trauma Study Group

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In one paragraph

Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
1.3field-weighted citation impact, top 21% 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

2 citing papers in PubMed, 8 citations in OpenAlex.

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4 · The record

Corrections and comments

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5 · Who and what money

Authors and funding

9 authors at 6 institutions in 3 countries.

Juan P CabreraDepartment of Neurosurgery, Hospital Clínico Regional de Concepción, San Martín 1436, Concepción, Chile. jucabrera@udec.cl.ORCID 0000-0003-4685-6106
Ratko YuracDepartment of Orthopedic and Traumatology, Department of Traumatology, University del Desarrollo (UDD). Spine Unit, Clínica Alemana, Santiago, Chile.ORCID 0000-0003-3603-6294
Alfredo GuiroySpine Unit, Orthopedic Department, Hospital Español de Mendoza, Mendoza, Argentina.ORCID 0000-0001-9162-6508
Andrei F JoaquimDepartment of Neurosurgery, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.ORCID 0000-0003-2645-0483
Charles A CarazzoDepartment of Neurosurgery, University of Passo Fundo, São Vicente de Paulo Hospital, Passo Fundo, Rio Grande do Sul, Brazil.ORCID 0000-0001-6339-2214
Juan J ZamoranoDepartment of Orthopedic and Traumatology, Department of Traumatology, University del Desarrollo (UDD). Spine Unit, Clínica Alemana, Santiago, Chile.ORCID 0000-0002-7284-0784
Kevin P WhiteScienceRight Research Consulting, London, ON, Canada.ORCID 0000-0001-6527-1037
Marcelo ValaccoDepartment of Orthopedic and Traumatology, Hospital Churruca Visca, Buenos Aires, Argentina.ORCID 0000-0002-9697-3856
AO Spine Latin America Trauma Study Group
Universidad del Desarrollo · CLHospital Privado de Comunidad · ARUniversidade de Passo Fundo · BRUniversidade Estadual de Campinas (UNICAMP) · BRUniversity of Concepción · CLUniversity of Mendoza · AR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeA classification system was recently developed by the international association AO Spine for assessing subaxial cervical spine fractures. Significant variability exists between users of the facet component, which consists of four morphological types (F1-F4). The primary aims of this study were to assess the diagnostic accuracy and reliability of this new system's facet injury morphological classifications.

methodsA survey consisting of 16 computed tomography (CT) scans of patients with cervical facet fractures was distributed to spine surgeon members of AO Spine Latin America. To provide a gold standard diagnosis for comparison, all 16 injuries had been classified previously by six co-authors and only were included after total consensus was achieved. Demographic and surgical practice characteristics of all respondents were analyzed, and diagnostic accuracy calculated. Inter- and intra-observer agreement rates were calculated across two survey rounds, conducted one month apart.

resultsA total of 135 surgeons completed both surveys, among whom the mean age was 41.6 years (range 26-71), 130 (96.3%) were men, and 83 (61.5%) were orthopedic surgeons. The mean time in practice as a spine surgeon was 9.7 years (1-30). The overall diagnostic accuracy of all responses was 65.4%. Inter-observer and intra-observer agreement rates for F1/F2/F3/F4 were 55.4%/47.6%/64.0%/94.7% and 60.0%/49.1%/58.0%/93.0%, respectively.

conclusionThis study evaluates the AO Spine Classification System specifically for facet injuries involving the subaxial cervical spine in a large sample of spine surgeons. There was significant variability in diagnostic accuracy for F1 through F3-type fractures, whereas almost universal agreement was achieved for F4-type injuries.

Indexed as

Spinal FracturesSpinal InjuriesAdultAgedCervical VertebraeHumansMaleMiddle AgedNeckReproducibility of ResultsClassificationFacet jointObserver variationSpine fractureSubaxial cervical spine

Identifiers

PMID33842992
OpenAlexW3155568631

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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.