Background: In horses, therapeutic ultrasound has been shown to be beneficial for suspensory ligament injuries, and more generally to stimulate tissue repair and reduce localized pain. However, it has yet to be examined in relation to soft tissue injuries sustained during competition or in connection with rider/saddle interactions. Aim: The aim of the present study was to examine the efficacy of topical low-frequency therapeutic ultrasound on the shoulder muscles of injured horses. Methods: Muscle mass and cellular health was assessed for M. trapezius using non-invasive multi-frequency bioimpedance, and dynamic improvements in M. trapezius and M. latissimus dorsi were examined using acoustic myography (AMG). A total of 8 injured horses (painful to palpation and atrophied) were treated using an EQ Pro Therapy unit, following a set protocol that comprised treatment every other day for 10 treatments. Pre-treatment values were then compared with post-treatment measurements (1 & 6 months later). Results: The mfBIA results for M. trapezius showed a significant improvement (P < 0.05) of EQ Pro Therapy treatment for the membrane capacitance (Mc) and phase angle (PA) parameters when comparing the Pre vs Post 1 and Post 1 vs Post 2 measurements. Similar improvements were seen for the AMG measurements for M. trapezius and M. latissimus dorsi where statistically significant improvements in the muscle efficiency (E-score) and temporal summation (T-score) as well as the spatial summation (S-score) and mean of the ST-scores were noted
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