The Radial Arc technique: A systematic ultrasound method to imaging the distal biceps brachii tendon from a medial approach with anatomical insights

Introduction: Distal biceps brachii tendon disorders predominantly result from repetitive use and eccentric loading. High-resolution ultrasound has emerged as a preferred diagnostic tool due to its dynamic imaging capabilities, accessibility, and cost-effectiveness. Topic Description: This paper introduces the Radial arc technique, a didactic and systematic ultrasound scanning method from a medial approach designed to facilitate the identification of the distal biceps brachii tendon insertion in the long-axis view. The technique is a five-step sonographic approach navigating sonographers and clinicians through a series of landmarks to address the often-complex sonographic examination of the distal biceps brachii tendon insertion. The paper also provides detailed anatomical insights into the biceps brachii muscle and the distal tendinous complex, highlighting key morphological features critical for accurate ultrasound interpretation. Discussion: The proposed approach is tailored to support the educational development of undergraduate and postgraduate students specialising in musculoskeletal sonography and enhance the practical skills of early-career and experienced sonographers and clinicians utilising point-of-care ultrasound. The anatomical framework provided offers a deeper understanding of the distal biceps brachii tendinous complex, supporting diagnostic accuracy for distal biceps brachii tendon-related conditions that are critical for guiding patient management. Conclusion: The systematic nature of the Radial arc technique aims to standardise practices not only in clinical settings but also in the design and execution of research studies involving the assessment of the distal biceps brachii tendon integrity with ultrasound. Future research should focus on assessing the reproducibility of the Radial arc technique in diverse clinical settings and among different practitioners and operators, crucial for its adoption in sonographic diagnostics.