Evidence map›Paper›PMID 34651434›Full record

ArticleOrthopaedic surgery2021

Characterization of a Novel Model of Lumbar Ligamentum Flavum Hypertrophy in Bipedal Standing Mice.

Zhen-Yu Zheng, Peng Li, Xiang Ao, Lei Qian, Yong-Xing Peng, Jun Chu, Tao Jiang, Zheng-Nan Lian, Zhong-Min Zhang, Liang Wang

Open access · goldAbstract read
In one paragraph

Article in Orthopaedic surgery, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed
3.5field-weighted citation impact, top 7% 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, 28 citations in OpenAlex.

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  8. Inhalation ofPharmaceuticals (Basel, Switzerland) · 2023
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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

10 authors at 2 institutions in 2 countries.

Zhen-Yu Zheng *Department of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Peng Li *Department of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.ORCID https://orcid.org/0000-0002-5027-5526
Xiang AoDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Lei QianDepartment of Anatomy, Guangdong Province Key Laboratory of Medical Biomechanics, Southern Medical University, Guangzhou, China.
Yong-Xing PengDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Jun ChuDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Tao JiangDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Zheng-Nan LianDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Zhong-Min ZhangDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Liang WangDepartment of Orthopaedics, The Third Affiliated Hospital, Southern Medical University, Academy of Orthopaedics, Guangzhou, China.
Third Affiliated Hospital of Southern Medical University · CNSouthern Medical University · CN

Funding

National Natural Science Foundation of China 81672228National Natural Science Foundation of China 81702199National Natural Science Foundation of China 81874013
6 · The paper itself

Abstract

objectiveTo explore the main causes of hypertrophied ligamentum flavum (HLF) and the possibility of using bipedal standing mouse model to simulate the pathological changes in human HLF.

methodsThirty-two 8-week-old C57BL/6 male mice were randomly assigned to the experimental group (n = 16) and control group (n = 16). In the experimental group, mice were induced to adopt a bipedal standing posture by their hydrophobia. The experimental mice were maintained bipedal standing for 8 h a day with an interval of 2 h to consume food and water. The control mice were placed in a similar environment without bipedal standing. Eight 18-month-old C57BL/6 male mice were compared to evaluate the LF degeneration due to aging factor. Three-dimensional (3D) reconstruction and finite element models were carried out to analyze the stress and strain distribution of the mouse LF in sprawling and bipedal standing postures. Hematoxylin and Eosin (HE), Verhoeff-Van Gieson (VVG), and immunohistochemistry (IHC) staining were used to evaluate the LF degeneration of mice and humans. RT-qPCR and immunofluorescence analysis were used to evaluate the expressions of fibrosis-related factors and inflammatory cytokines of COL1A1, COL3A1, α-SMA, MMP2, IL-1β, and COX-2.

resultsThe von Mises stress (8.85 × 10

conclusionOur study suggests that 3D finite element models can help analyze the abnormal stress and strain distributions of LF in modeling mice. Mechanical stress is the main cause of hypertrophied ligamentum flavum compared to aging. The bipedal standing mice model can reflect the pathological characteristics of human HLF. The bipedal standing mice model can provide a standardized condition to elucidate the molecular mechanisms of mechanical stress-induced HLF in vivo.

Indexed as

Standing PositionAnimalsBiomechanical PhenomenaDisease Models, AnimalHumansHypertrophyLigamentum FlavumLumbar VertebraeMaleMiceMice, Inbred C57BLSpinal StenosisAgingFinite element analysisHypertrophy of ligamentum flavumMechanical stressMouse model

Identifiers

PMID34651434
PMCPMC8654658
OpenAlexW3205531348

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

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.