Abstract
Purpose
The aim of this study is to correlate the ultrasound (US) appearance of the persistent double or bifid distal tendon of the biceps brachii muscle with anatomical and histological data. This will provide a new model to study the pathological distal biceps brachii tendon (DBBT).
Methods
The DBBT of 20 cadaveric elbows were examined with linear array broadband US transducers (frequency band 14–6 MHz) using an anterior approach. Trypan blue dye was injected underneath the paratenon under US guidance in 16 specimens. After they were dissected, five of them were processed to obtain histological slices stained with hematoxylin–eosin and antiserum to protein S100.
Results
At US, the DBBT is a tendon in which the fascicles are organized in two different hyperechoic components separated by a hyperechoic septum related to the endotenon. The endotenon is lax, flexible, and makes folding and gliding of the two portions feasible. The DBBT is surrounded by a hyperechoic paratenon adjacent to the tendon surface, which is only differentiable by US when dye is interposed between such structures.
Conclusions
The connective septum of endotenon located between the two main components of the DBBT is responsible for the US image of two separate tendons and functionally enables it to work as two separate entities, thus allowing respective folding and gliding. The paratenon surrounding the lacertus fibrosus and the DBBT plays an important stabilization role, enabling them to change shape and arrangement during joint motion. It is also an important conduit for nerves and blood vessels.
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Acknowledgments
The authors are thankful to body donors that enable the study of anatomy. We also thank Nieves Cayuela and Eva Sanchez for their help and assistance in the laboratory. Supported by grants ACESB08/09 (Faculty of Medicine, C. Bellvitge, University of Barcelona) and 2009SGR152 (AGAUR, Generalitat de Catalunya, Spain).
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The authors declare that they have no conflict of interest.
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Blasi, M., de la Fuente, J., Martinoli, C. et al. Multidisciplinary approach to the persistent double distal tendon of the biceps brachii. Surg Radiol Anat 36, 17–24 (2014). https://doi.org/10.1007/s00276-013-1136-y
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DOI: https://doi.org/10.1007/s00276-013-1136-y