Article

The purpose of this paper was to systematically assess the effect of Oxford Foot
Model (OFM) marker misplacement on hindfoot relative to tibia, and forefoot
relative to hindfoot kinematic calculations during the stance phase of gait.
Marker trajectories were recorded with an 8-camera motion analysis system (Vicon
Motion Systems Ltd., UK) and ground reaction forces were recorded from three
force platforms (AMTI, USA).
A custom built marker cluster consisting of 4
markers in a square arrangement (diagonal distance 2 cm) was used to assess the
effect of marker misplacement in the superior, inferior, anterior and posterior
direction for the sustentaculum tali (STL), the proximal 1st metatarsal (P1M),
distal 5th metatarsal (D5M), proximal 5th metatarsal (P5M) and lateral calcaneus
(LCA) markers. In addition manual movement of the heel complex 1 cm superiorly,
inferiorly, medially and laterally, and also an alignment error of 10 degrees
inversion and 10 degrees eversion was assessed. Clinically meaningful effects of
marker misplacement were determined using a threshold indicating the minimal
clinically important difference. Misplacement of the heel-wand complex had the
most pronounced effect on mean kinematic profiles during the stance phase across
all degrees-of-freedom with respect to hindfoot-tibia and forefoot-hindfoot
angles. Vertical marker misplacement of the D5M and P5M markers affected the
sagittal plane, and to a lesser extent frontal plane, forefoot-hindfoot
kinematics. In conclusion, the OFM is highly sensitive to misplacement of the
heel-wand complex in all directions and the P5M marker in the vertical direction.
CI - Crown Copyright (c) 2015. Published by Elsevier B.V. All rights reserved.

Langue : ANGLAIS