Article

Kinematic analysis of the digits using optical motion capture systems relies on
defining accurate coordinate systems for the individual segments. Limitations of
previous digit kinematic protocols include marker placement errors, marker
occlusion and superimposition, and skin movement artifact. The purpose of this
study was to develop a protocol utilizing a digit alignment device (DAD) and nail
marker clusters to overcome these limitations. Ten subjects underwent 10 static
calibration trials for validation. The orientation of the thumb distal phalange
relative to the index finger distal phalange was described using Euler angles of
pitch(x), yaw(y'), and roll(z''). The digit calibration protocol demonstrated
high accuracy (0.5 degrees , 1.9 degrees and 2.2 degrees for x, y', z'') and
precision (1.4 degrees , 2.3 degrees and 3.1 degrees for x, y', z''). The
developed protocol provided convenient identification of transformations that
determine anatomically relevant coordinate systems for the distal phalanges of
the digits. The potential of utilizing this protocol as a standardized tool for
digit kinematics was demonstrated using a dynamic task of precision pinching.
CI - Published by Elsevier B.V.

Langue : ANGLAIS