Myoelectric Prosthetics Introduction to Upper Limb Prosthetics
Ottobock offers complete upper-limb prosthetic solutions for every ..
Studies reporting the overall functionality of commercially available devices compared with limbs of intact subjects, as measured by the overall index-of-function score of the Southampton Hand Assessment Procedure (SHAP), show wide variation in mitigation of impairments of grasp. To date, no terminal device tested has been shown to restore function completely to all major grasp patterns. Body-powered terminal devices may be VO or VC, with some evidence that VC devices are associated with faster task performance as measured by the SHAP (). SHAP index-of-function scores for several two-joint, single-degree-of-freedom terminal devices have been reported to be about 74 percent and 43-84 percent, respectively, compared with the functionality typical of an intact hand (; ; ). The SHAP index-of-function scores for several commercially available multiarticulating hands have been reported in multiple studies: 52-76 percent for the i-limb Hand (; ), 87-88 percent for the i-limb Pulse (), and 75-89 percent for the Michelangelo hand (). Other research has found that myoelectric prosthesis users had average index-of-function scores of 43-50 percent compared with an intact hand ().
Lake Prosthetics and Research - Upper Limb Prosthetics
Several studies have found substantially lower dexterity in users of upper-limb prostheses of all amputation levels compared with age-matched norms (), as well as slower time to complete movements and activities (; ). Slower speeds are attributable, in part, to the fact that prosthesis users must perform more discrete submovements to perform basic tasks (; ). In addition, grasping is uncoupled from reaching when one is using a prosthesis, which makes reaching for and grasping an object take longer (; ; ).