Intrarater reliability test of the ISOmetric power device-A new instrument for assessment of isometric force in six directions of wrist motion.

Study Design: Descriptive reliability study.

Introduction: A well-functioning wrist requires sufficient range of motion accompanied by adequate strength in every movement and direction-factors that are not regularly measured simultaneously in patients with wrist problems today. The ISOmetric Power device (ISOP) is a new instrument that measures isometric wrist force in all six directions of motion, but its intrarater reliability in a healthy population has not yet been evaluated.