Comparison Between Three Types of Prosthetic Feet

Study Overview
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Brief Summary
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One Solid Ankle Cushion Heel (SACH) and two Dynamic Elastic Response (DER) prosthetic feet will be tried six times in random order by the patient. The patient will be an active prosthetic foot user who walks several kilometers per day and was amputated at the trans-tibial level because of injury. Gait pattern will be rated in comparison with the patient's previous prosthetic foot by a physiatrist, physiotherapist, prosthetist and the patient. One-leg standing and 10-meter walking tests will also be performed.

Detailed Description
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The prosthetic feet will be: one SACH foot (by Otto Bock - foot C, advertised for activity category 1) and two DER feet (Dynamic Motion by Otto Bock - foot B, advertised for activity category 2-3; and Triton by Otto Bock - foot A, advertised for activity category 3-4). All the prosthetic feet are of the same size and chosen for the patient's weight. They will be covered so that neither the patient nor professionals will be able to see which prosthetic foot is being used. The study is blinded because the prosthetist designated for changing the prosthetic feet will be the only one who will know which prosthetic is being used. The orientational sample size calculation and the randomisation plan were prepared by a statistician. The first trial will be performed using the patient's own prosthetic foot in order to establish a baseline. The patient will then have to to compare the prosthetic feet with his own existing prosthetic foot and rate the ability to walk on even terrain (100m), uneven terrain (grass, 100m), decline and incline (i.e., slope), and up and down the stairs (one floor) on a five-point Likert-type scale (-2 much worse, -1 slightly worse, 0 the same, 1 slightly better, 2 much better). After each trial he will also perform the one-leg standing test (with three repetitions) and the 10-meter walking test. Before each trial, the patient will be given 15 minutes for adaptation to each new prosthetic foot without the presence of the assessors. The three expert observers will be: a physical and rehabilitation medicine specialist physician, a certified prosthetist-orthotist, and a physiotherapist. Each has got over 20 years of experience in rehabilitation of patients after amputation and observation of their gait. They will be blind to the currently used prosthetic foot. They will follow the patient and assess his walking using the same rating scale in comparison with the initial trial as the patient.

Official Title
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Comparison Between Three Types of Prosthetic Feet: a Randomized Double-blind Controlled Single-subject Multiple-rater Trial

Conditions
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Amputation; Traumatic, Leg, Lower, Between Knee and Ankle

Intervention / Treatment
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* Device: C-SACH
* Device: B-DER
* Device: A-DER


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: active prosthetic foot user who walks several kilometers per day amputation at the trans-tibial level >5 years ago Exclusion Criteria: other medical problems

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 60 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: Device Feasibility
Allocation: Randomized
Intervention Model: Sequential Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: C-SACH<br>All the interventions will be administered to the patient in this single-subject trial, each 6 times | Device: C-SACH<br>* Solid Ankle Cushion Heel by Otto Bock, advertised for activity category 1<br>|
| Active Comparator: B-DER<br>All the interventions will be administered to the patient in this single-subject trial, each 6 times | Device: B-DER<br>* Dynamic Motion by Otto Bock, advertised for activity category 2-3<br>|
| Active Comparator: A-DER<br>All the interventions will be administered to the patient in this single-subject trial, each 6 times | Device: A-DER<br>* Triton by Otto Bock, advertised for activity category 3-4<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Rating | Likert-type, compared to the patient's existing prosthetic foot (-2 much worse, -1 slightly worse, 0 the same, 1 slightly better, 2 much better) | Immediately after each trial | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The time that the patient can stand on the prosthetic foot | Measured by the one-leg standing test (average of three repetitions) | Immediately after the rating, repeated 3 times | 
| Walking velocity | Measured by the 10-meter walking test | Immediately after the one-leg standing test | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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one leg standing, walking speed, prosthetic feet, gait pattern