Design and Initial Evaluation of a Low-Cost Microprocessor-Controlled Above-Knee Prosthesis: A Case Report of 2 Patients

For prosthesis users, knee units can range from simple devices costing $2000 up to $45,000 for high-end, microprocessor-controlled systems. These higher-end electronic knees provide significant advantages in stability, gait, and metabolic rate compared their passive or mechanical counterparts. However, the high cost of such systems makes them inaccessible most amputees. In this study, it was hypothesized that a microprocessor could be manufactured less than $1000, with comparable stability user experience high-end industry standard device. A prototype (E-Knee) designed specific emphasis on stance tested during patient gait trials. The trials used repeated measures design compare three (a knee, E-Knee, knee). Ground reaction forces functionality questionnaire were devices. locking test evaluate prototype’s ability prevent falls. Building LIMBS M3, four-bar polycentric device, E-Knee added sensing, computing, controlling capabilities material $507. Initial data two-subject trial served as proof-of-concept validate found improved by providing more M3 had gait-pattern similarities Ottobock C-Leg M3. Patients reported no perceived differences between C-Leg. Patient supported behaved naturally low-end device similar ground