Myotendinous Junction Anesthesia: An Alternative Infiltration Site for Ultrasound-Guided Injections.

Rosales, Julio; Droppelmann, Guillermo; García, Nicolás; Saravia, Anthony; Molina, Claudio; Jorquera, Carlos · Arthrosc Tech · 2025

expert_opinion · Level V

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Abstract

The myotendinous junction is a highly specialized and complex structure between muscle and tendon. In recent years, various procedures have directly targeted the tendon, with corticosteroid, platelet-rich plasma, or biological therapy infiltrations being prominent. However, these interventions are painful, corticosteroids have demonstrated tendon damage, and anesthesia negatively impacts tenocyte proliferation and viability when used with platelet-rich plasma in the same injection site. There is a need to adapt the injection site to improve therapy effectiveness and pain tolerance. This article presents a proposal for an ultrasound-guided anesthetic block procedure in the myotendinous junction.