Two-Segment Foot Model for the Biomechanical Analysis of Squat

Table 2

Segment local reference frames.

	Origin	x-axis	y-axis	z-axis	Graphic description
Shank	Ankle joint center AC	Cross product between y- and z-axes	Perpendicular to the plane identified by MMAL, LMAL, KC	Vector from AC to KC
Foot	C1	Perpendicular to y axis and the vectors KC-AC	Vector from C1 to D2MT	Cross product between x- and y-axes
Hindfoot	C1	Cross product between vector C1-AC and vector C1-HFV1	Vector from C1 to HFV1	Cross product between x- and y-axes
Forefoot	MTC	Cross product between y- and z-axes	Vector from MTC to D2MT	Perpendicular to the plane identified by P1MT, P5MT, and MTC