Evidence map›Paper›PMID 34392563›Full record

ArticleJournal of orthopaedic research : official publication of the Orthopaedic Research Society2022

Progression of muscle loss and fat accumulation in a rabbit model of rotator cuff tear.

Mario A Vargas-Vila, Michael C Gibbons, Isabella T Wu, Mary C Esparza, Kenji Kato, Seth D Johnson, Koichi Masuda, Samuel R Ward

Open access · greenAbstract read
In one paragraph

Article in Journal of orthopaedic research : official publication of the Orthopaedic Research Society, 2022. 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
2.7field-weighted citation impact, top 9% 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, 16 citations in OpenAlex.

  1. Article
  2. Article
  3. Intramuscular adipose tissue: from progenitor to pathology.American journal of physiology. Cell physiology · 2025
    Review
  4. Ginsenoside Rb1 affects mitochondrial CaMolecular medicine (Cambridge, Mass.) · 2024
    Article
  5. Article
  6. Article
  7. Article
  8. Nicotinamide Phosphoribosyltransferase-elevated NADJournal of cachexia, sarcopenia and muscle · 2023
    Article
  9. Article
  10. Article
  11. Review
  12. Article
  13. Large animal models for the study of tendinopathy.Frontiers in cell and developmental biology · 2022
    Review
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 at 3 institutions in 2 countries.

Mario A Vargas-VilaDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.
Michael C GibbonsDepartment of Bioengineering, UC San Diego, La Jolla, California, USA.
Isabella T WuDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.
Mary C EsparzaDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.
Kenji KatoDepartment of Orthopaedic Surgery, Nagoya City University, Nagoya, Japan.
Seth D JohnsonDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.
Koichi MasudaDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.
Samuel R WardDepartment of Orthopaedic Surgery, UC San Diego, La Jolla, California, USA.ORCID 0000-0002-4470-155X
UC San Diego Health System · USNagoya City University · JPUniversity of California San Diego · US

Funding

Promotion of Skeletal Muscle Recovery Using an Extracellular Matrix Hydrogel in a Rabbit Model of Chronic Rotator Cuff InjuryR21AR072523 · NIAMS · UNIVERSITY OF CALIFORNIA, SAN DIEGO · PI CHRISTMAN, KAREN L, WARD, SAMUEL RICHARD · 2018 to 2019
$353k
NIAMS NIH HHS R21 AR072523
6 · The paper itself

Abstract

Rotator cuff (RC) tears present a treatment challenge due to muscle atrophy and degeneration, fatty infiltration, and fibrosis. The purpose of this study was to generate a high time-resolution model of RC tear in rabbits and to characterize the progression of architectural and histological changes. Thirty-five female New Zealand White rabbits (age: 6 months) underwent left supraspinatus tenotomy. Five rabbits were used to evaluate immediate muscle architectural changes. The remaining 30 rabbits underwent right shoulder sham surgery and sacrifice at 1, 2, 4, 8, or 16 weeks. Histology was used to quantify muscle fiber cross-sectional area (CSA), muscle degeneration and regeneration, and fat localized to inter- versus intrafascicular regions. Muscle fiber CSA decreased by 26.5% compared to sham at 16 weeks (effect of treatment, p < 0.0001). Muscle degeneration increased after tenotomy (effect of treatment, p = 0.0006) without any change in regeneration. Collagen and fat content increased by 4 weeks and persisted through 16 weeks. Interfascicular fat was increased at all time points, but intrafascicular fat was increased only at 1, 4, and 16 weeks posttenotomy. Intrafascicular fat adjacent to degenerating muscle fibers increased as well (effect of treatment, p < 0.0001; effect of time, p = 0.0102). Statement of clinical relevance: Rabbit supraspinatus tenotomy recapitulates key features of the pathophysiology of human RC tears, including muscle atrophy and degeneration, lack of regeneration, fat accumulation, and fibrosis.

Indexed as

Rotator Cuff InjuriesAdipose TissueAnimalsFemaleFibrosisMuscular AtrophyRabbitsRotator Cuffmuscle injuriesmuscle physiologyrotator cuffshoulder

Identifiers

PMID34392563
PMCPMC8844305
OpenAlexW3196045139

What OpenQuestion holds

Textmetadata
LicenceTDM
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.