Article

Unlike sagittal plane prosthesis alignment, few studies have
observed the effects of transverse plane alignment on gait and prosthesis
behaviour. Changes in transverse plane rotation angle will rotate the points of
loading on the prosthesis during stance and may alter its mechanical behaviour.
This study observed the effects of increasing the external transverse plane
rotation angle, or toe-out, on foot compression and effective lever arm of three
commonly prescribed prosthetic feet. Technique: The roll-over shape of a SACH,
Flex and single-axis foot was measured at four external rotation angle conditions
(0 degrees , 5 degrees , 7 degrees and 12 degrees relative to neutral).
Differences in foot compression between conditions were measured as average
distance between roll-over shapes. Discussion: Increasing the transverse plane
rotation angle did not affect foot compression. However, it did affect the
effective lever arm, which was maximized with the 5 degrees condition, although
differences between conditions were small. Clinical relevance Increasing the
transverse plane rotation angle of prosthetic feet by up to 12 degrees beyond
neutral has minimal effects on their mechanical behaviour in the plane of walking
progression during weight-bearing.

Langue : ANGLAIS