Evidence map›Paper›PMID 30203221›Full record

ArticleJournal of experimental orthopaedics2018

A cadaveric model to evaluate the effect of unloading the medial quadriceps on patellar tracking and patellofemoral joint pressure and stability.

Joanna Stephen, Avinash Alva, Punyawan Lumpaopong, Andy Williams, Andrew A Amis

Open access · goldAbstract read
In one paragraph

Article in Journal of experimental orthopaedics, 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
1.2field-weighted citation impact, top 22% 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

17 citing papers in PubMed, 41 citations in OpenAlex.

  1. Article
  2. Patellofemoral Instability in the Adolescent Age Group.Indian journal of orthopaedics · 2026
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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

5 authors at 3 institutions in 1 country.

Joanna StephenBiomechanics Group, Mechanical Engineering Department, Imperial College London, London, SW7 2AZ, UK.
Avinash AlvaFortius Clinic, Fitzhardinge Street, London, W1H 6EQ, UK.
Punyawan LumpaopongBiomechanics Group, Mechanical Engineering Department, Imperial College London, London, SW7 2AZ, UK.
Andy WilliamsBiomechanics Group, Mechanical Engineering Department, Imperial College London, London, SW7 2AZ, UK.
Andrew A AmisBiomechanics Group, Mechanical Engineering Department, Imperial College London, London, SW7 2AZ, UK. a.amis@imperial.ac.uk.
Imperial College London · GBChelsea and Westminster Hospital · GBFortius Clinic · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundVastus Medialis Muscles (VMM) damage has been widely identified following patellar dislocation. Rehabilitation programmes have been suggested to strengthen the VMM and reduce clinical symptoms of pain and instability. This controlled laboratory study investigated the hypothesis that reduced Vastus Medialis Obliquus (VMO) and Vastus Medialis Longus (VML) muscle tension would alter patellar tracking, stability and PFJ contact pressures.

methodsNine fresh-frozen dissected cadaveric knees were mounted in a rig with the quadriceps and iliotibial band loaded to 205 N. An optical tracking system measured joint kinematics and pressure sensitive film between the patella and trochlea measured PFJ contact pressures. Measurements were repeated for three conditions: 1. With all quadriceps heads and iliotibial band (ITB) loaded; 2. as 1, but with the VMO muscle unloaded and 3. as 1, but with the VMO and VML unloaded. Measurements were also repeated for the three conditions with a 10 N lateral displacement force applied to the patella.

resultsReduction of VMM tension resulted in significant increases in lateral patellar tilt (2.8°) and translation (4 mm), with elevated lateral and reduced medial joint contact pressures from 0.48 to 0.14 MPa, and reduced patellar stability (all p < 0.05).

conclusionsThese findings provide basic scientific rationale to support the role of quadriceps strengthening to resist patellar lateral maltracking and rebalance the articular contact pressure away from the lateral facet in patients with normal patellofemoral joint anatomy.

Indexed as

Contact pressureKinematicsMuscle weaknessPatellofemoral jointVastus medialis

Identifiers

PMID30203221
PMCPMC6131679
OpenAlexW2891233325

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.