Abstract Summary
Achilles tendon (AT) moment arm (ATMA) was measured in vivo during running by combining motion capture and ultrasound (US) data. Results were compared to tendon excursion and regression equation ATMA values, and the effect of using different ATMA values on Achilles tendon force established. All methods produced physiologically realistic ATMA values (47.7 to 61.9 mm), but differences between methods and calculated AT forces were statistically significant. Correction for marker size and skin thickness are important when using ultrasound and motion capture (difference of ~750 N in calculated forces).
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