Neurology Edited by Professor Emeritus Desire' Dubounet, IMUNE

Determine the level of sensory loss and consult Figure 8 as if it were atransverse sensory loss impairment.Convert this transverse sensory loss to a longitudinal sensoryimpairment by using Table 4.Example: A longitudinal ulnar sensory loss at the level of thethumb interphalangeal joint is a 15% impairment of the thumb.Abnormal MotionThe thumb has four functional units of motion, each contributing arelative value to the total thumb function:1. Flexion / extension of the metacarpophalangeal and interphalangealjoints (20% of the total value of thumb motion). On a 100% scale, arelative value of 55% is given to the metacarpophalangeal joint and of45% to the interphalangeal joint. This is equivalent to 55% x 20% =11% for the metacarpophalangeal joint, and 45% x 20% = 9% for theinterphalangeal joint.2. Adduction (20% of total motion value).3. Radial abduction (10% of total motion value).4. Opposition (50% of total motion value).