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Updated: Aug 14, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
The 'black hole' sign: a visual ultrasonographic sign of hip dislocation
1Department of Orthopaedic Surgery, Blackburn Royal Infirmary, UK.
Abstract:
Visual analysis of dynamic ultrasonography was employed in the assessment of hip stability in the neonate/infant. The 'black hole' sign visually describes the clearly recognizable ultrasonographic image of hip dislocation/dislocatability. This sign adds objectivity to the technique of visual analysis and is to be recommended.
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