Chorea footwear

Components

A low sole with a wider edge.

Design notes

Ground contact, turning and toe clearance need testing.

Model and sources

These calculations do not predict falls or shoe safety.

95 mm wide

Model margin -16.4 mm

115 mm wide

Model margin -6.4 mm

Negative values do not predict a fall; positive values do not establish safety.

At centered position, zero-crossings: 14.9 cm/s reference, 18.0 cm/s concept.

Equations and assumptions

omega = sqrt(g / h)
XCoM = x + v / omega
margin = base_width / 2 - XCoM

g = 9.81 m/s². x = 0. h is the assumed center-of-mass height. v is sideways velocity in m/s. XCoM combines position and velocity.

The model assumes a rigid base with full ground contact. It excludes steps, turns and material deformation. Dimensions are not fitting advice.

Trade-off assumptions

These coefficients are assumed, not measured. They cannot determine a safe width.

benefit = 0.10 × flare
cost = 0.0016 × weight × flare²

Model

Position and velocity define a model boundary. This is not a footwear test.

Movement

Seven participants with HD and seven controls. The study did not test footwear.