Precision Measurement of Radiographic Parameters in the Evaluation of Scapholunate Dissociation

Description

This instructional video, presented by Katherine Fortson, provides a comprehensive guide on how to collect radiographic measurements from wrist X-rays, emphasizing the Larson method. The tutorial outlines several key measurements, beginning with the scapholunate gap, which is observed best through a pencil grip view. Fortson explains how to properly visualize the scaphoid and lunate bones, draw circles around the midcarpal joint, and measure the gap between these two structures with precision.



Following this initial measurement, the video transitions to more advanced techniques including establishing a radial reference line using lateral X-ray views, measuring the radial axis, and identifying critical angles like the radial lunate and radial scaphoid angles. Recommendations are made regarding common measurement challenges, such as distinguishing between cortices and ensuring measurements are accurate.



Tools such as the annotate feature are utilized to facilitate the drawing of lines that are vital for visualizing measurements like the angle of the lunate and scaphoid axes. As the tutorial progresses, it addresses corrected angles based on wrist positioning during X-ray imaging and concludes with the measurement of dorsal scaphoid translation (DST), a key indicator in diagnosing scapholunate dissociation.



Throughout the video, helpful tips are provided to ensure measurements are taken correctly and implications of various scores are discussed, including the relevance of small DST scores. This tutorial is a valuable resource for medical professionals looking to enhance their skills in radiographic analysis of wrist structures.

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