The ability to accurately measure daily activity levels in lower extremity amputee patients is important for a better understanding of their use of prosthetic limbs. Most studies have shown that patients often report their activity level inaccurately. More objective data on activity levels will not only provide information helpful for determining the appropriate prosthetic components for an individual, it will also be helpful when assessing the effects that medical illness have on activity levels and in objectively determining the benefits of rehabilitation. In addition, being able to measure activity accurately will allow further verification of currently developed clinical surveys designed to determine amputee activity in a practical form.