Neurology Edited by Professor Emeritus Desire' Dubounet, IMUNE

Example: Implant resection arthroplasty of metacarpophalangeal jointsof index, middle, and ring fingers with a range of motion of -10° extensionto 70° flexion for each. Fusion of index proximal interphalangeal joint at40° flexion and simple resection arthroplasty of thumb carpometacarpaljoint with fusion of thumb metacarpophalangeal joint at 20° flexion.1. Index finger:PIP joint fusion at 40° flexion: IA% = 50% impairment of the finger(Figure 25).MP joint implant arthroplasty = 50% impairment of the index finger MPjoint.MP joint -10° extension: IE% = 7% impairment of the index finger; 70°flexion: IF% = 11% impairment of the index finger (Figure 28); 7% +11%= 18% impairment of the index finger due to MP joint motion.Index finger impairment is found using the Combined Values Chart:50% combined with 50% = 75%; 75% combined with 18% = 80%impairment of the index finger.The index finger represents 20% of the hand; therefore 80% x 20% =16% impairment of the hand (Table 1).2. Middle finger.-MP joint implant arthroplasty = 50% impairment of the middle finger MPjoint.MP joint -10° extension: IE% = 7% impairment of the middle finger; 70°flexion: IF% = 11 % impairment of the middle finger (Figure 28); 7% +11% = 18% impairment of the middle finger due to MP joint motion.Middle finger impairment is found using the Combined Values Chart:50% combined with 18% = 59% impairment of the middle fingerThe middle finger represents 20% of the hand; therefore, 59% x 20%= 12% impairment of the hand (Table 1).