Fig. 2
From: A novel method of measuring passive quasi-stiffness in the first metatarsophalangeal joint
a Moment arm for first MTPJ is length of proximal phalanx. b Perpendicular force applied to the proximal phalanx dorsiflexes the first MTPJ. θ is angular displacement in degrees. The dotted line represents the resting position of the proximal phalanx or the “zero” reference point. c Still image from video recording capturing showing line of resting position. d Still image from video recording showing angular displacement, θ