Understanding How Powered Componentry Impacts K2-Level Transfemoral Amputee Gait
Shirley Ryan AbilityLab
Summary
The goal of this study is to understand how providing power at the knee or ankle individually, or providing power at both the knee and ankle, impacts ambulation for K2 level transfemoral amputees. Aim 1: measure functional performance of K2 level ambulators when using a commercially available passive microprocessor knee prosthesis (Ottobock Cleg/Ottobock foot) or a powered knee and ankle prosthesis (SRALab Hybrid Knee and SRAlab Polycentric Powered Ankle. Aim 2: Participants will be evaluated on the contribution of adding power at the knee only or the ankle only. Aim 3: The investigators will evaluate the functional performance after intensive clinical gait training on the powered knee and ankle prosthesis (SRALab Hybrid Knee and SRALab Polycentric Powered Ankle). Our hypothesis is that providing powered componentry will improve function and that intensive training will magnify those improvements.
Description
Amputation of the lower limb causes profound disability, significantly limiting mobility, independence, and the ability to pursue employment or leisure activities. Nearly 90% of all lower limb amputations in the United States occur in older persons, mostly due to vascular disease, and this population is expected to triple by 2050. After lower limb loss, individuals walk more slowly and more asymmetrically are less stable, and expend more metabolic energy during walking than persons with intact limbs. Even when using state-of-the-art microprocessor-controlled prostheses (typically a microproces…
Eligibility
- Age range
- 18–95 years
- Sex
- All
- Healthy volunteers
- No
Inclusion Criteria: * Ages 18-95 * A unilateral transfemoral amputation * At least 6 months since definitive prosthesis fitting * Able to walk 50 meters (55 yards) with a prosthesis without the assistance of another person. * Medically cleared by physician to participate in study * English speaking Exclusion Criteria: * Weight greater than 250 pounds * Significant new injury that would prevent use of a prosthesis: The ability to consistently wear a prosthesis and perform activities of daily living and specific performance tasks is necessary to evaluate the relative benefits of the intervent…
Interventions
- DeviceOttobock CLeg4 + Ottobock foot
Commercially available Ottobock CLeg 4 microprocessor knee unit and Ottobock foot.
- DeviceSRALAB Hybrid Knee + Polycentric Ankle
Experimental powered prosthesis: SRALAB Hybrid Knee and powered polycentric ankle.
- DeviceSRALAB Hybrid Knee + Passive Ankle
Experimental powered prosthesis: SRALAB Hybrid Knee and passive ankle.
- DeviceOttobock CLeg 4 + Polycentric Ankle
Commercially available Ottobock CLeg 4 prosthetic knee and SRALAB powered polycentric ankle.
Location
- Shirley Ryan AbilityLabChicago, Illinois