Efficiency of Hydraulic Microprocessor Prosthetic Foot for Traumatic Transtibial Amputees

Study Overview
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Brief Summary
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Background: Trauma is the second most common factor for transtibial amputations, just after vascular background. Traumatic amputees generally function better than amputees due to vascular background. The type of prosthetic foot fitted to the patient depends on his mobility and functional level, and significantly influences his stability and gait symmetry. A prosthetic foot with a hydraulic ankle provides significant advantages for high level functioning amputees: decrease of loads in the residuum, improvement in symmetry and generally gait pattern that is closer to natural. The hydraulic prosthetic foot has recently been upgraded to include computerized control over the ankle movement, using input from an array of sensors inside the foot. Studies have demonstrated decrease in energy consumption and gait pattern that is more similar to healthy people. However, hydraulic feet with and without computer control have not been compared. Furthermore, the effects of a computerized foot on various important factors have not been investigated yet, e.g. loads in the residuum, the movement of the center of pressure and the patient's satisfaction. Research objectives: To compare between hydraulic prosthetic feet, with and without computerized control. The comparison will be made while walking on flat or inclined surfaces (positive or negative inclination). Differences in gait parameters, loads inside the residuum, center of mass movement and patient's satisfaction will be quantified. Research hypothesis: Using a computerized prosthetic foot will provide better mobility performances: improved gait factors and center of pressure movement, decrease internal loads in the residuum and increase patient's satisfaction. Research design: Clinical controlled research with research group(amputees) and control group (healthy).

Detailed Description
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The research group will perform a gait analysis test (on a computerized treadmill) using their own non-computerized hydraulic foot, while in-socket pressures are measured. The prosthetic foot will then be replaced by a computerized prosthetic foot for one month, following which, the measurements will be repeated. Gait factors will be examined (spatio-temporal data, center of pressure movement) and internal loads inside the residuum will be evaluated. Comparison will also include patient's satisfaction and his ability to move around, evaluated by dedicated questionnaire.

Official Title
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Evaluation of the Efficiency of Hydraulic Microprocessor Prosthetic Foot for Traumatic Transtibial Amputees

Conditions
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Unilateral Transtibial Amputee

Intervention / Treatment
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* Device: Elan foot prosthesis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age: 20 to 70 years old Traumatic unilateral Transtibial Amputee Using Echelon foot prosthesis for at least 6 months K level 3 or 4 Exclusion Criteria: Injury of the sound limb that compromises the gait of the amputee.

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Elan foot prosthesis<br>The research group will perform a gait analysis test (on a computerized treadmill) using their own non-computerized hydraulic foot, while in-socket pressures are measured. The prosthetic foot will then be replaced by a computerized prosthetic foot for one month, following which, the measurements will be repeated. Gait factors will be examined (spatio-temporal data, center of pressure movement) and internal loads inside the residuum will be evaluated. Comparison will also include patient's satisfaction and his ability to move around, evaluated by dedicated questionnaire. | Device: Elan foot prosthesis<br>* The research group will perform a gait analysis test (on a computerized treadmill) using their own non-computerized hydraulic foot, while in-socket pressures are measured. The prosthetic foot will then be replaced by a computerized prosthetic foot for one month, following which, the measurements will be repeated. Gait factors will be examined (spatio-temporal data, center of pressure movement) and internal loads inside the residuum will be evaluated. Comparison will also include patient's satisfaction and his ability to move around, evaluated by dedicated questionnaire.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Center of pressure movement |  | 2 to 6 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pressure on the skin and internal loads in the residuum (measured by a surface pressure mapping technology). |  | 2 to 6 weeks | 
| Grade in questionnaire for prosthetic evaluation. |  | 2 to 6 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Echeclon, Elan, TTA, Transtibial Amputee