Evidence map›Paper›PMID 40866692›Full record

ArticleSkeletal radiology2026

Snapping low-lying articularis genu muscle belly: a rare and unexpected cause of superolateral knee pain and knee snapping.

Fionn Coughlan, Elise Chua, Alexander Haenel, Anne Drury, Timothy Eanna Murray, Mark Cresswell

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In one paragraph

Article in Skeletal radiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
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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

0 citing papers in PubMed.

No citing paper in PubMed yet.

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

6 authors.

Fionn CoughlanDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada. fionn.coughlan@health.wa.gov.au.ORCID http://orcid.org/0000-0001-5070-5330
Elise ChuaDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada.
Alexander HaenelDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada.
Anne DruryDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada.
Timothy Eanna MurrayDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada.
Mark CresswellDepartment of Radiology, St. Paul's Hospital, Vancouver, BC, Canada.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

We report a rare case of a low-lying anomalous muscle belly, the articularis genu muscle, as a cause of snapping and pain. The initial MR examination was reported as normal. Dynamic ultrasound evaluation allowed identification of the low-lying muscle as the etiology of the snapping and pain. Ultrasound-guided anesthetic injection confirmed the diagnosis with relief of symptoms and allowed subsequent further treatment with botulinum toxin. To our knowledge, the articularis genu muscle has not been previously described as a cause of knee snapping.

Indexed as

ArthralgiaKnee JointMuscle, SkeletalAdultDiagnosis, DifferentialFemaleHumansMagnetic Resonance ImagingMaleUltrasonographyUltrasonography, InterventionalArticularis genuDynamic ultrasoundKnee painLow-lying muscle bellyMagnetic resonance imagingSnapping

Identifiers

PMID40866692

What OpenQuestion holds

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Registered trials

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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.