Quantifying Prosthetic Socket Interface Movement
This study will quantify motion occurring at the socket interface of transhumeral prosthesis users during common tasks. Participants in the study will use a body powered prosthesis with a hosmer hook terminal device. A motion analysis system and a novel optical sensor embedded into the socket wall will record the amount of movement between the residual limb and socket of the prosthesis. Participants will complete range of motion and functional tasks. The range of motion tasks include shoulder flexion, abduction and rotation as well as elbow flexion. The functional tasks include bilateral lift of weighted basket, unilateral lift of weighted handle, box and blocks test, walk and carry a gallon of milk, and folding a towel. It is expected that the more weight at the terminal device the more rotation at the interface, as well as more slip between residual limb and device. It is also expected that the soft tissues of the residual limb can be modeled as a nonlinear spring and the amount of movement at the interface can be predicted based off the force in the system.
|Study Design:||Observational Model: Case-Only
Time Perspective: Cross-Sectional
|Official Title:||Quantifying Prosthetic Socket Interface Movement|
- Magnitude of prosthetic socket rotation and slip [ Time Frame: 3 hours ] [ Designated as safety issue: No ]Motion capture data and optical sensor data will be used to calculate the amount of prosthetic socket rotation and slip. It is predicted that current socket designs will have some degree of socket movement during normal activities due to soft tissue deformation.
- Magnitude of prosthetic socket movement relative to end effector loading [ Time Frame: 3 hours ] [ Designated as safety issue: No ]Motion capture data and optical sensor data will be used to calculate the amount of socket movement compared to the terminal device loading for the various tasks. It is predicted that tasks which have more load at the terminal device will result in more socket movement.
- Magnitude of prosthetic socket movement relative to the amount of residual limb rotation. [ Time Frame: 3 hours ] [ Designated as safety issue: No ]The amount of socket movement will be compared to the amount of residual limb rotation for each task. Residual limb rotation is the angle between the upper arm segment and the scapula segment. It is hypothesized the greater the residual limb angle, the greater the amount of socket movement.
- Difference in range of motion of the shoulder joint between no prosthesis, the original prosthetic socket, and the duplicate socket [ Time Frame: 3 hours ] [ Designated as safety issue: No ]It is predicted that the range of motion of the shoulder will be statistically the same between the original and duplicate socket.
|Study Start Date:||May 2013|
|Study Completion Date:||May 2014|
|Primary Completion Date:||May 2014 (Final data collection date for primary outcome measure)|
Transhumeral prosthesis user
Transhumeral body-powered prosthesis user
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Please refer to this study by its ClinicalTrials.gov identifier: NCT01932892
|United States, Florida|
|Rehabilitation Robotics and Prosthetics Testbed|
|Tampa, Florida, United States, 33617|
|Study Director:||Stephanie Carey, PhD||University of South Florida|