ArticleSkeletal radiology2026
Intra-articular gas on knee MRI: a meniscal tear mimic and description of a novel MRI sign.
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.
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Abstract
Intra-articular gas is a recognized mimic of meniscal tears on knee MRI, typically resulting from a vacuum phenomenon caused by joint distension and negative intra-articular pressure. This study presents three cases demonstrating transient intra-articular gas that simulated meniscal pathology but was ultimately identified as a benign vacuum phenomenon. We describe a novel diagnostic clue, the "rising tide sign," which refers to the progressive disappearance of intra-articular gas and the posterior-to-anterior migration of the fluid interface in a gravity-dependent manner, resembling rising tidal water. Recognition of this sign enables differentiation between true meniscal tears and gas artifacts, thereby avoiding false-positive diagnoses and potential unnecessary surgical intervention.
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