Typically people need separate prosthetic feet for running and walking. To bridge the gap, this study will test the Compliant Adaptive Energy Storage and Return (CAESAR) foot. This foot can change from a walk mode to a run mode with the push of a button. The investigators will test and improve this foot design mechanically, and then test this design on individuals with lower limb amputation in a lab setting. The goal of this project is to develop a passive prosthetic foot that can serve two purposes in someone's daily life: walking and running, to allow them to be more active.
Typically people need separate prosthetic feet for running and walking. To bridge the gap, this study will test the Compliant Adaptive Energy Storage and Return (CAESAR) foot. This foot can change from a walk mode to a run mode with the push of a button. The investigators will test and improve this foot design mechanically, and then test this design on individuals with lower limb amputation in a lab setting. The goal of this project is to develop a passive prosthetic foot that can serve two purposes in someone's daily life: walking and running, to allow them to be more active. Here we will test this device to determine how it affects the user's mechanics during running and walking. Participants will come to a research laboratory for three test sessions where they will run and walk in their current foot, a commercial high-activity foot, and the prototype CAESAR foot.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
6
The primary concept of the CAESAR foot is to switch from a walking foot to a running foot with the push of a button
Participants will be fit with a high activity foot designed to be used for walking and running
University of Michigan
Ann Arbor, Michigan, United States
Peak Propulsive Ground Reaction Force on the Prosthetic Side During Walking
Participants will walk over sensors that measure the force under their foot. Peak ground reaction force in the anterior direction is measured in Newtons and then divided by the individual's body weight (BW). The resultant force is measured in Body-weights.
Time frame: All conditions were complete during 3 lab visits, approximately four hours long
Participants Perceived Comfort When Using Different Prosthetic Feet During Walking
Participants were asked their perceived comfort on a visual analog scale from 0 (most uncomfortable) to 100 (most comfortable)
Time frame: All conditions were complete during 3 lab visits, approximately four hours long
Peak Propulsive Ground Reaction Force on the Prosthetic Side During Running
Participants will run on a treadmill with force sensors below the treadmill belt. Data will be measured in Newtons and then normalized by dividing by body weight.
Time frame: All conditions were complete during 3 lab visits, approximately four hours long
Participants Perceived Comfort When Using Different Prosthetic Feet During Running
Participants were asked their perceived comfort on a visual analog scale from 0 (most uncomfortable) to 100 (most comfortable)
Time frame: All conditions were complete during 3 lab visits, approximately four hours long
Net V02 (Metabolic Cost) During Running
Participants will wear a mask that measures their rate of oxygen consumption while they run for 5 minutes at a comfortable pace
Time frame: All conditions were complete during 3 lab visits, approximately four hours long
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