Evidence map›Paper›PMID 29147849›Full record

ArticleEuropean journal of applied physiology2018

Heterogeneity of passive elastic properties within the quadriceps femoris muscle-tendon unit.

Brooke K Coombes, Brandon Ziegenfuss, Michael David, Rohitha Badya, Wolbert van den Hoorn, François Hug, Kylie Tucker

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Article in European journal of applied physiology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed, 1 pooled it
1.0field-weighted citation impact, top 24% 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

14 citing papers in PubMed, 1 synthesis or guideline pooled it, 31 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 1 institution in 2 countries.

Brooke K CoombesSchool of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia. b.coombes@uq.edu.au.ORCID http://orcid.org/0000-0002-6163-1047
Brandon ZiegenfussSchool of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
Michael DavidSchool of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, 4072, Australia.
Rohitha BadyaSchool of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
Wolbert van den HoornNHMRC Centre for Clinical Research Excellence in Spinal Pain, Injury and Health, The University of Queensland, Brisbane, 4072, Australia.
François HugNHMRC Centre for Clinical Research Excellence in Spinal Pain, Injury and Health, The University of Queensland, Brisbane, 4072, Australia.
Kylie TuckerSchool of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
The University of Queensland · AU

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe purpose of this study was to compare regional elastic properties between anterior and posterior regions of the patellar tendon, and individual quadriceps muscles, over a range of knee flexion angles.

methodsAn isokinetic dynamometer passively positioned the non-dominant knee of 19 young, healthy participants, at 25°, 40°, 55°, 70° and 85° flexion. Shear wave velocity (SWV, an index of tissue elasticity) was measured using ultrasound shear wave elastography in a relaxed (passive) state, confirmed by electromyography.

resultsSWV of the patellar tendon and quadriceps muscles increased with knee flexion (longer muscle-tendon unit; P < 0.001). Within the proximal third of the patellar tendon, SWV was lower in the posterior than anterior region at 70° (P = 0.002) and 85° (P < 0.001), but not at 25°, 40° or 55° (region-by-angle interaction, P = 0.007). No differences were found between anterior and posterior regions within the middle third of the patellar tendon (P = 0.332). For the quadriceps muscles, a significant muscle-by-angle (P < 0.001) interaction was also observed. SWV of VL was greater than VM at 55° (P = 0.005), 70° (P = 0.001) and 85° (P < 0.001), but not at 25° or 40°. SWV of RF was lower than VL at all angles (all P < 0.002) and lower than VM at 55°, 70° and 85° (all P < 0.002).

conclusionsPassive knee flexion at and beyond 70° was associated with non-uniform elastic properties within the proximal patellar tendon and between individual quadriceps muscles. To what extent this heterogeneity of passive elastic properties contributes to injury remains unknown.

Indexed as

ElasticityFemaleHumansMaleMuscle ContractionPatellar LigamentQuadriceps MuscleYoung AdultElasticityElastographyKneePatellarStress-shieldingTendinopathy

Identifiers

PMID29147849
OpenAlexW2768596780

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.