Optimizing locations for recording biomechanical and viscoelastic properties of soleus muscle and plantar fascia

Abstract

Introduction: MyotonPRO technology is a clinically accessible tool for objectively monitoring the biomechanical and viscoelastic properties of musculoskeletal tissues. This study aimed to identify the level of accuracy needed for recording from specified measurement sites on the soleus muscle and plantar fascia (PF), which are important for postural control and gait. 

Methods: in 20 healthy adults, MyotonPRO measurements were taken 1 cm above and below a standardized point on the soleus and PF. Ultrasound scans were also taken at each site to measure subcutaneous tissue thickness to aid interpretation of MyotonPRO findings. 

Results: biomechanical and viscoelastic properties of the soleus and PF, measured using the MyotonPRO, were not affected by the change in the recording site. Subcutaneous tissue thickness above the PF changed significantly (<FOR VERIFICATION>p <FOR VERIFICATION> < 0.001) by 0.61 cm when moving distally by 2 cm, whilst above the soleus, these did not differ significantly (<FOR VERIFICATION>p = 0.175) when moving distally by 2 cm.

Conclusion: changing the recording site 1 cm above or below the standardized site did not affect either the MyotonPRO results (soleus and PF) or ultrasound results for soleus, whilst this same distance affected ultrasound measurements of subcutaneous tissue thickness above the PF significantly. Moving away from the musculoskeletal junction reduces the need for precision in relocating the recording site for measuring soleus. These findings allow for quicker and easier measurement of soleus or PF using the MyotonPRO.

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