The Cobra sign: A marker for overestimation of tendon retraction in proximal semimembranosus tendon avulsion.

ABSTRACT:

Purpose

To introduce a new magnetic resonance imaging (MRI) sign, termed the Cobra sign, and identify its diagnostic metrics. The secondary aim was to demonstrate that this sign can be a source of false evaluation of tendon retraction in patients with proximal hamstring avulsion injury.

Method

This retrospective cohort study targeted patients surgically treated for proximal hamstring avulsion injury from January 2019 to June 2023. The MRI Cobra sign was defined as a wavy curved T2-hypointense band with the free end folding distally over itself, resembling a cobra head. The primary outcome measure was the characterization of the Cobra sign in patients with proximal hamstring avulsion injury. The secondary outcome was the association of this sign with tendon retraction. The st

SUBMITTER: Lefevre N 

PROVIDER: S-EPMC11792104 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature