RSscan footscan, User Manual

Page: 112 / 179

A positive value indicates a higher load on the first toe, a negative value indicates a
higher load on M1.
Foot balance (Mediolateral foot distribution)
Mediolateral foot balance is defined as the mediolateral pressure distribution of the
entire foot during stance phase. The mediolateral foot balance is calculated by
comparing the pressure underneath the medial aspect of the foot (M1+M2+MH) with the
pressure underneath the lateral aspect of the foot (M3+M4+M5+LH).
A higher pressure underneath the medial aspect of the foot suggests a pronation of the
foot, a higher pressure underneath the lateral aspect of the foot suggests a supination
of the foot.
Forefoot balance (Mediolateral Forefoot distribution)
Mediolateral forefoot distribution is defined as the pressure distribution at the level of
the forefoot during stance phase. The mediolateral forefoot distribution is calculated by
comparing the medial aspect of the forefoot (M1 + M2) with the lateral aspect of the
forefoot (M3 + M4 + M5).
An increased pressure underneath the medial aspect of the forefoot suggests a
pronation of the forefoot, an increased pressure underneath the lateral aspect of the
forefoot suggests a supination of the forefoot.
Medial forefoot balance
The medial forefoot balance or distribution is defined as the pressure distribution
between metatarsal1 (M1) and metatarsal2 (M2) during stance phase. The medial
forefoot distribution is calculated by comparing the pressure underneath M1 and M2.
A positive value indicates a higher load on metatarsal 2, a negative value indicates a
higher load on metatarsal 1. A high value indicates a large difference in load between
metatarsal 1 and 2.
Meta loading
Meta loading is defined as the pressure distribution between the inner metatarsal heads
and the outer metatarsal heads during stance phase. Meta loading is calculated by
comparing the inner metatarsals (M2+M3) with the outer metatarsals (M1 + M4 + M5).
A positive value indicates a higher load on the inner metatarsal heads, a negative value
indicates a higher load on the outer metatarsal heads. A high value for meta loading
indicates a large difference in load on the inner metatarsal heads compared to the outer
metatarsals.
The gait ratio calculations are based on the anatomical zones, the used formulas for the
different gait ratio calculations are:
heel rotation: (MH-LH)/Zavrg*100
hallux stiffness: (T1-M1)/Zavrg*100
foot balance: ((M1+M2+MH)-(M3+M4+M5+LH))/Zavrg*100
forefoot balance: ((M1+M2)-(M3+M4+M5))/Zavrg*100
medial forefoot balance: (M2-M1)/Zavrg*100
meta loading: ((M2+M3)-(M1+M4+M5))/Zavrg*100
The meaning of the variables (anatomical zones) in the formulas is as follows:
M
x
: the force under meta
x
zone.
MH: the force under the medial heel zone.
LH: the force under the lateral heel zone.
RS-PRD-00562-016 112