Article

Several studies have attempted to measure how well external markers track
internal bone movement using pins drilled into the foot, but this is too invasive
for the pediatric population. This study investigated how well a six segment foot
model (6SFM) using external markers was able to measure bone movement in the foot
compared to MRI measurements. The foot was moved into different positions using a
plastic foot jig and measurements were taken with both systems. The aims were to:
(1) Look at the correlation between movement tracked with an Electronic Motion
Tracking System (EMTS) and by measurements derived from MRI images, specifically
the principal intercept angles (PIAs) which are the angles of intersection
between principal axes of inertia of bone volumes. (2) To see how well external
motion measured by the 6SFM could predict PIAs. Four bone pairs had their
movement tracked: Tibia-Calcaneus, Calcaneus-Cuboid, Navicular-1st Metatarsal,
and 1st Metatarsal-Hallux. The results showed moderate correlation between
measured PIAs and those predicted at the Tibia-Calcaneus, Navicular-1st
Metatarsal, and 1st Metatarsal-Hallux joints. Moderate to high correlation was
found between the PIA and movement in a single anatomic plane for all four joints
at several positions. The 6SFM using the EMTS allows reliable tracking of 3D
rotations in the pediatric foot, except at the Calcaneus-Cuboid joint.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.

Langue : ANGLAIS