INTRODUCTION Dynamic elastic response (DER) feet are prostheses that store and release energy during gait. They are designed for active lower-limb amputees and believed to be beneficial by enhancing mobility and function. However, the design of a DER foot appears to be based on a trial-and-error basis. At present, there is little scientific evidence to guide the clinical prescription of DERs. P...

The standard method used to calculate the ankle joint power contains deficiencies when applied to dynamic elastic response prosthetic feet. The standard model, using rotational power and inverse dynamics, assumes a fixed joint center and cannot account for energy storage, dissipation, and return. This study compared the standard method with new analysis models. First, assumptions of inverse dyn...

The large majority of prosthetic feet are aimed at low-heeled shoes, with a few models allowing a heel height of up to 5 cm. However, a survey by the American Podiatric Medical Association indicates that most women wear heels over 5 cm; thus, current prosthetic feet limit most female prosthesis users in their choice. Some prosthetic foot components are heel-height adjustable; however, their pla...

Abstract Passive ankle-foot prostheses are light-weighted and reliable, but they cannot generate net positive power, which is essential in restoring the natural gait pattern of amputees. Recent robotic addressed problem by actively controlling storage release energy generated during stance phase through mechanical deformation elastic elements housed device. This study proposes an innovative low...

Maximum weight bearing observed, using a static weighing scale, in above-knee amputees wearing an airsplint, with a foot, was 10 kg and in below-knee amputees 11 kg with inflation pressures of 40 mmHg. While airsplints with a foot permitted greater weight bearing before deformation occurred, the increase is judged to be of little clinical advantage. Use of an airsplint without a foot would be m...

Unilateral below-knee amputees develop abnormal gait characteristics that include bilateral asymmetries and an elevated metabolic cost relative to non-amputees. In addition, long-term prosthesis use has been linked to an increased prevalence of joint pain and osteoarthritis in the intact leg knee. To improve amputee mobility, prosthetic feet that utilize elastic energy storage and return (ESAR)...

The ability to control balance during walking is a critical precondition for minimizing fall risk, but this ability is compromised in persons with lower-limb absence because of reduced sensory feedback mechanisms and inability to actively modulate prosthesis mechanical function. Consequently, these individuals are at increased fall risk compared with nondisabled individuals. A number of gait pa...

Appropriate muscular response following an external perturbation is essential in preventing falls. Transtibial prosthesis users lack a foot-ankle complex and associated sensorimotor structures on the side with the prosthesis. The effect of this lack on rapid responses of the lower limb to external surface perturbations is unknown. The aim of the present study was to compare electromyogram (EMG)...