Prehension
Pronunciation: preh-HEN-shun
The ability of an upper-limb prosthetic terminal device to grasp, hold, and manipulate objects, analogous to the grasping function of the natural hand.
Full Definition
Prehension describes the functional gripping and object-manipulation capability of upper-limb prosthetic terminal devices, whether voluntary-opening hooks, myoelectric hands, or multi-articulating digit systems. It encompasses both the mechanical action (opening and closing of the device) and the nuanced motor control required for tasks of daily living. In prosthetics literature, prehension is categorised into types such as lateral (key) pinch, palmar (three-jaw chuck) pinch, and power grasp, each addressed by different terminal device designs. Editors must be careful not to substitute 'prehension' with 'grip' or 'grasping' without considering precision of meaning, particularly in clinical outcome measure documentation. The term appears in functional assessments, manufacturer device specifications, and rehabilitation goal-setting documents.
Usage
Usage note: Do not use 'apprehension' as a variant; in clinical documents, 'apprehension' has a distinct meaning related to patient anxiety or joint testing.