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Clinical Outcomes With Passive MPKs vs. Powered Prosthetic Knees

Primary Purpose

Amputation, Amputation; Traumatic, Leg, Lower, Limb; Absence, Congenital, Lower

Status
Recruiting
Phase
Not Applicable
Locations
United States
Study Type
Interventional
Intervention
Power Knee
Sponsored by
Liberating Technologies, Inc.
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional other trial for Amputation focused on measuring amputee, lower limb amputee, transfemoral amputee, prosthetic knee, power knee, microprocessor knee, MPK, Ossur, lower limb prosthesis user

Eligibility Criteria

18 Years - undefined (Adult, Older Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria:

  • Are at least 18 years old
  • Unilateral transfemoral prosthesis user (limb absence between the knee and hip)
  • Current user of a microprocessor-controlled knee (MPK)
  • Have adequate clearance between distal end and ground for necessary knee and foot components
  • Medicare Functional Classification Level (K-Level): 4
  • Socket-Comfort Score: 6 or above to ensure adequate socket fit
  • PLUS-M T-score of 55 or above
  • Six months or more experience on a prosthesis
  • Body weight between 50kg and 116kg (110lbs - 256lbs)

Exclusion Criteria:

  • Present injuries to residual limb or contralateral leg affecting functional ability
  • Socket issues/changes in the last 6 weeks
  • Users with bone-anchored implants

Subjects can be excluded at the discretion of the investigator for other unforeseen disqualifying criteria (such as specific cognitive issues, etc.). Subjects in this study will not be discriminated by sex/gender or race/ethnicity.

Using a knee that the subject is unfamiliar with may increase the risk of falling. Therefore, pregnant women should not participate in the study and will be screened by self-disclosure.

Sites / Locations

  • Liberating Technologies, Inc.
  • Hanger ClinicRecruiting

Arms of the Study

Arm 1

Arm 2

Arm Type

No Intervention

Experimental

Arm Label

Comparator Baseline

Power Knee

Arm Description

The subject will wear their usual Microprocessor Knee (MPK) for 3 months, as well as in the lab to complete outcome measures.

The subject will wear the Ossur PK in place of their usual MPK for 3 months, as well as in the lab to complete outcome measures.

Outcomes

Primary Outcome Measures

Step count
Prior to each condition, each subject will be fit and aligned on the designated knee by a trained certified prosthetist. An activity monitor (such as the GeneActiv™) will be worn by the subject during each 3 month intervention period. Similar to prior studies, the investigators will use the activity monitor to track the number of steps the subjects take in each condition.
Activities-Specific Balance Confidence scale (ABC) - Measuring change from baseline
Activities-specific balance confidence (ABC) scale is a structured questionnaire that measures an individual's confidence during ambulatory activities without falling or experiencing a sense of unsteadiness. It consists of 16 questions gauging the individual's confidence while doing activities, from 0 (no confidence) to 4 (complete confidence). This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.
PEQ-Well Being (PEQ-WB) - Measuring change from baseline
The version of the PEQ which will be administered consists of 2 questions in 1 category (well being). For purposes of easier administration, the investigators have adopted the modified 10-point ordinal scale version of the PEQ-WB (scale 1-10, where 1 is the worst and 10 is the best relative to the questions being asked). This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.

Secondary Outcome Measures

Six Minute Walk Test (6MWT) - Measuring change from baseline
The 6MWT is a sub-maximal exercise test used to assess walking endurance and aerobic capacity. Participants will walk a set circuit for a total of six minutes. The distance covered over a time of 6 minutes is used as the outcome by which to compare changes in performance capacity. This assessment may be performed at each site visit.
Stair Assessment Index (SAI)
The Stair Assessment Index (SAI) is an observational outcome measure designed to assess an individual's ability to ascend and descend stairs. The SAI is a 14-level ordinal scale that spans a functional continuum from choosing not to ascend or descend the stairs to a fully independent step-over-step stair gait. A SAI rating is independently assigned to the activities of stair ascent and stair descent. These ratings reflect the individual's degree of independence and quality of movement in stair gait. The 14 ratings of the SAI are based on several central characteristics of stair gait including the ability to perform the task, the need for assistance, the use of an assistive device, and the gait style chosen to perform the task. This assessment may be performed at each site visit.
Hill Assessment Index (HAI)
The Hill Assessment Index (HAI) is an observational outcome measure designed to assess an individual's ability to ascend and descend hills. The HAI is a 12-level ordinal scale that spans a functional continuum from choosing not to ascend or descend the specified incline or decline to a fully independent symmetric gait pattern. A HAI rating is independently assigned to the activities of hill ascent and descent. These ratings reflect the individual's degree of independence and the quality of movement. The 12 ratings of the HAI are based on several central characteristics of inclined gait, including the ability to perform the task, the need for assistance, the use of an assistive device, and the gait style chosen to perform the task. This assessment may be performed at each site visit.
Timed Up and Go Test (TUG)
The Timed Up and Go (TUG) may be used to measure physical mobility, assess fall risk, and predict prosthetic nonuse in patients with a lower-limb amputation who are using a prosthesis. In the timed up and go (TUG) test, subjects are asked to rise from a standard armchair, walk to a marker 3 m away, turn, walk back, and sit down again. The test is timed in seconds using a stopwatch. The test is a reliable and valid test for quantifying functional mobility that may also be useful in following clinical change over time. This assessment may be performed at each site visit.
Patient Reported Outcomes Measures Information System - Physical Function (PROMIS-PF)
The form being administered is PROMIS Physical Function short form 10b.PROMIS Physical Function (PROMIS PF) measures the outcome of patients or clients by assessing physical function through a grading scale of activities of daily living. PROMIS PF is used as an outcome in research on the effectiveness of interventions. The questions are answered on a scale from 1-5, with 1 being 'unable to do' and 5 being 'able to do without difficulty', pertaining to an activity. This survey will be administered as a part of the master questionnaire.
PLUS-M Version 3.0 - Measuring change from baseline
This version of the PLUS-M is a 12 item short form. Responses are scored from 1-5, with 1 being 'unable to do' and 5 being 'without any difficulty', pertaining to an activity. The scores will be added together to make the 'raw score', which can then be translated to T-score, Standard Error, and percentile. This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.
Borg Rating of Perceived Exertion (RPE)
The Borg Rating of Perceived Exertion (RPE) is a way of measuring physical activity intensity level. Perceived exertion is how hard the participant feels like their body is working. The original scaling is from 6-20, corresponding to approximate heart rate (x10 beats per minute). The investigators will be using the adapted Borg CR10 scale, which scales from 0-10 (0=no exertion at all, 10=maximal exertion).
Physiological Cost Index (PCI)
The PCI uses heart rate to indicate the energy cost of walking. The 3 items needed to calculate this measure are resting heart rate, working heart rate, and walking speed. PCI = (Working HR - Resting HR) / Walking Speed. Heart rate and walking speed will be collected and calculated for the 6MWT.
Patient Reported Outcomes Measures Information System - Fatigue (PROMIS-FAT)
The form being administered is PROMIS Fatigue short form 8a. The PROMIS Fatigue item banks assess a range of self-reported symptoms, from mild subjective feelings of tiredness to an overwhelming, debilitating, and sustained sense of exhaustion that likely decreases one's ability to execute daily activities and function normally in family or social roles. Fatigue is divided into the experience of fatigue (frequency, duration, and intensity) and the impact of fatigue on physical, mental, and social activities. The fatigue short forms are universal rather than disease-specific. All assess fatigue over the past seven days. The questions are answered on a scale from 1-5, with 1 being "not at all" or "never", and 5 being "very much" or "always". This survey will be administered as a part of the master questionnaire.
Self reported falls
A digital fall questionnaire will be delivered at most weekly through a HIPAA secure system to the patient's phone. This questionnaire has been used in the past by Hanger. If the subject responds positively that they had a fall, follow up questions may be asked to get more specific details. The subject may be asked to provide additional notes periodically to document their problems, experiences, and feedback.
Patient Reported Outcomes Measures Information System - 29 (PROMIS-29)
The PROMIS-29 is a short form assessment containing four items from each of seven PROMIS domains (Depression, Anxiety, Physical Function, Pain Interference, Fatigue, Sleep Disturbance, and Ability to Participate in Social Roles and Activities) which are all scaled from 1-5, plus one pain intensity question (0-10 numeric rating scale). This survey will be administered as a part of the master questionnaire.
Oswestry Disability Index (ODI)
The Oswestry Disability Index is a tool that researchers and disability evaluators use to measure a patient's permanent functional disability. The patient is asked 10 questions, each with 6 possible answers. The answers are scored 0-5. The total score corresponds to disability level (no disability, mild disability, moderate disability, severe disability, completely disabled). This survey will be administered as a part of the master questionnaire.
Patient Reported Outcomes Measures Information System - Ability to Participate in Social Roles and Activities (PROMIS-APSRA)
The PROMIS-APSRA is a short form that assesses an individual's perceived ability to perform their usual social roles and activities. The form being administered is PROMIS-APSRA short form 8a. The questions are answered on a scale from 1-5, with 1 being "never", and 5 being "always". This survey will be administered as a part of the master questionnaire.

Full Information

First Posted
December 9, 2021
Last Updated
May 19, 2022
Sponsor
Liberating Technologies, Inc.
Collaborators
Hanger Clinic: Prosthetics & Orthotics
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1. Study Identification

Unique Protocol Identification Number
NCT05267639
Brief Title
Clinical Outcomes With Passive MPKs vs. Powered Prosthetic Knees
Official Title
Clinical Outcomes With Passive MPKs vs. Powered Prosthetic Knees by K4-level Transfemoral Amputees
Study Type
Interventional

2. Study Status

Record Verification Date
May 2022
Overall Recruitment Status
Recruiting
Study Start Date
May 1, 2022 (Actual)
Primary Completion Date
April 30, 2023 (Anticipated)
Study Completion Date
April 30, 2023 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
Liberating Technologies, Inc.
Collaborators
Hanger Clinic: Prosthetics & Orthotics

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
Yes
Product Manufactured in and Exported from the U.S.
Yes
Data Monitoring Committee
No

5. Study Description

Brief Summary
The goal of this proposed project is to gather community-based data from the K4-level Transfemoral Amputee (TFA) population to aid in evidence-based prescription of powered prosthetic knees (i.e., choosing the right device to maximize the benefit for each patient). The investigators envision that this Level 1 submission will transition into a larger follow-on Level 2 trial that will explore a larger spectrum of patient populations (K2-K4), as well as testing additional Power Knees currently in development that are expected to become commercialized in the near future. The investigators intend to use this Level 2 trial data to guide the implementation of effective prescriptions towards those that can benefit most from a given device and limit prescription to those who would not see benefit in order to ensure the most judicious use of Department of Defense (DoD) and Veteran's Affairs healthcare dollars. The findings will also be shared with the research community to help drive the design of future devices by identifying what features and functions are most beneficial to which patient populations when the devices are used outside of the laboratory. In summary, more community-based data on how powered prosthetic knees compare with MPKs is needed to allow for improved clinical decision making and clinical outcomes.
Detailed Description
The goal of this proposed project is to gather community-based data from the K4-level Transfemoral Amputee (TFA) population to aid in evidence-based prescription of powered prosthetic knees (i.e., choosing the right device to maximize the benefit for each patient). The investigators envision that this Level 1 submission will transition into a larger follow-on Level 2 trial that will explore a larger spectrum of patient populations (K2-K4), as well as testing additional Power Knees currently in development that are expected to become commercialized in the near future. The investigators intend to use this Level 2 trial data to guide the implementation of effective prescriptions towards those that can benefit most from a given device and limit prescription to those who would not see benefit in order to ensure the most judicious use of Department of Defense (DoD) and Veteran's Affairs healthcare dollars. The findings will also be shared with the research community to help drive the design of future devices by identifying what features and functions are most beneficial to which patient populations when the devices are used outside of the laboratory. In summary, more community-based data on how powered prosthetic knees compare with MPKs is needed to allow for improved clinical decision making and clinical outcomes. This study will focus on investigating the tradeoffs between the commercially available Ossur Power Knee and traditional MPKs to identify the prosthetic knee that is best suited for K4 users during different tasks. The investigators will assess measured, observed, and self-reported outcomes achieved through real-world use of the prosthetic knees. The results of this study will (1) provide initial data to inform the evidence-based prescription and use of powered knee technologies for K4-level individuals with sound scientific data, (2) provide pilot data for a larger clinical trial to further inform the evidence-based prescription of powered knee technologies to other K-levels to maximize patient benefit while optimizing device cost and thereby influencing clinical practice and informing policy decisions, and (3) provide data that can be disseminated to other researchers to inform the design of future powered prosthetic knees by understanding the needs of users and identifying the features and functions that are most valuable to this patient population as well as the capabilities and limitations of current devices. The primary outcome measures for each aim are outlined as follows: [Mobility Primary Outcome]: daily number of steps taken [Safety Primary Outcome]: Activities-Specific Balance Scale [Wellbeing Primary Outcome]: PEQ-Well-Being (PEQ-WB) The data collected in the in-clinic and take-home portions of this study will include number of steps and number of self-reported falls, and a series of standard outcomes measures, such as: 6MWT, SAI, RAI, PROMIS-PF short form, PLUS-M, TUG, ABC, RPE, PROMIS-Fat, fall count, PROMIS-29, ODI, PEQ-WB, and PROMIS-APSRA short form. The investigators plan to perform a pilot longitudinal randomized crossover study to compare the powered knee and passive microprocessor knees in individuals with unilateral transfemoral amputation. The two interventions, or conditions, to be tested are: (A) Ossur PK and (B) a standard MPK. For this study the investigators will recruit individuals who are currently MPK users; therefore, for the MPK condition, they will wear their usual prosthesis (e.g. Otto Bock C-leg, Össur Rheo, etc) as they represent the current standard of care. This will be recorded as a potential confounder in post-hoc analysis. Each participant will be provided with prosthetic knees for the powered knee condition. The order these conditions are tested in will be randomized across subjects. Block randomization using a previously developed custom software based on random number generation will be used to equally distribute the subjects into the 2 possible intervention orders (AB or BA). For each condition, the subject will be trained on and acclimated to the device during the first month of the take-home period, and then will continue to wear it at home after training for a total of three months per condition. There may be seasonal effects due to the timing of when the various test conditions are administered, however, the investigators plan to offset these effects with condition randomization, multiple site testing, and staggered start times. Testing will consist of test sessions, training sessions, at-home wear of the device, and functional and self-report assessment at the end of each intervention condition. If the subject's current foot is not compatible with the Power Knee, they will be provided with a commercially available prosthetic foot for the study. In this case, the subject will be given an initial acclimation period of 1 month on the new foot before starting interventional testing. After receiving IRB and HRPO (US Army Human Research Protection Office) approval, subjects will be recruited and screened for eligibility. If they are eligible and decide to participate, they will be scheduled for their first site visit. They will either be consented over the phone before their first site visit or at the first site visit. If over the phone, study staff will use the telephone script to confirm eligibility and guide the subject through consent form details. Subjects will be provided the informed consent form to read through entirely before signing, and are encouraged to ask questions at any time. Prior to each condition, each subject will be fit and aligned on the knee by a trained certified prosthetist. An activity monitor (such as the GeneActiv™) will be worn by the subject. As the investigators have done in prior studies, the investigators will use the activity monitor to track the number of steps the subjects take in each condition. Each subject will wear the same foot for all study periods for comparability between the two knee conditions. The subject will wear the knee being tested at home for three months. During the first month of each condition, subjects will be given time to acclimate to the knee being tested. Before and after each condition, the subject will complete a battery of outcomes and self-report surveys. Subjects will participate in at least two, but up to eight, 1 hour training sessions per knee. At a minimum, each subject will receive one training session to learn how to properly use each device for a variety of daily activities and a second session to demonstrate retention of the learned skills. The subject will continue training until they show retention of the understanding and/or proficiency of the device functions or until they have received eight training sessions, whichever comes first. After 8 training sessions, they will have completed all of the available training and will therefore continue with the study at their current proficiency level. For the powered knee condition, the investigators will work with trained and experienced clinicians, consulting prosthetic knee manufacturers as needed, to develop the training protocol and determine proficiency. At the last training session, the subject will complete a subset of the outcomes and self-report measures in order to collect and compare data from before and after the subject gets trained on each knee condition. After the training visits are completed, subjects will be asked to continue to wear the knee full time for the remainder of the three month take-home period. Through Hanger's current patient care system, the investigators will have the ability to push out a digital to the patient's phone asking them whether they have experienced a recent fall. If they respond positively that they had a fall, follow up questions can be asked to get more specific details about the fall. After three months of at-home wear, the subject will return for the second test visit. During that visit, functional tests and self-report surveys will be administered. At the completion of the second test visit (Period 1), the subject will then be fit and aligned on the prosthetic knee condition for Period 2. The training, at home wear, and in-clinic assessments will be repeated for the next knee condition.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Amputation, Amputation; Traumatic, Leg, Lower, Limb; Absence, Congenital, Lower, Prosthesis User, Lower Limb Amputation Above Knee (Injury), Amputation; Traumatic, Leg: Thigh, Between Hip and Knee
Keywords
amputee, lower limb amputee, transfemoral amputee, prosthetic knee, power knee, microprocessor knee, MPK, Ossur, lower limb prosthesis user

7. Study Design

Primary Purpose
Other
Study Phase
Not Applicable
Interventional Study Model
Crossover Assignment
Model Description
Participants will take home two interventional devices for data collection and feedback. One of the interventions will be their usual microprocessor knee to collect as a baseline, and the other will be the commercially available Ossur Power Knee. Participants will be trained on the interventional knees during the first month of at-home use. Functional outcome measures and self-report surveys will also be completed in-lab before and after each take-home intervention, as well as at the last training visit, in order to form a detailed comparison between the two interventions.
Masking
None (Open Label)
Allocation
Randomized
Enrollment
12 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
Comparator Baseline
Arm Type
No Intervention
Arm Description
The subject will wear their usual Microprocessor Knee (MPK) for 3 months, as well as in the lab to complete outcome measures.
Arm Title
Power Knee
Arm Type
Experimental
Arm Description
The subject will wear the Ossur PK in place of their usual MPK for 3 months, as well as in the lab to complete outcome measures.
Intervention Type
Device
Intervention Name(s)
Power Knee
Other Intervention Name(s)
Ossur Power Knee, Ossur Power Knee III, PK, PK3
Intervention Description
Newest version of the commercially-available Power Knee developed by Ossur.
Primary Outcome Measure Information:
Title
Step count
Description
Prior to each condition, each subject will be fit and aligned on the designated knee by a trained certified prosthetist. An activity monitor (such as the GeneActiv™) will be worn by the subject during each 3 month intervention period. Similar to prior studies, the investigators will use the activity monitor to track the number of steps the subjects take in each condition.
Time Frame
Monitored over entire study (6 months)
Title
Activities-Specific Balance Confidence scale (ABC) - Measuring change from baseline
Description
Activities-specific balance confidence (ABC) scale is a structured questionnaire that measures an individual's confidence during ambulatory activities without falling or experiencing a sense of unsteadiness. It consists of 16 questions gauging the individual's confidence while doing activities, from 0 (no confidence) to 4 (complete confidence). This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.
Time Frame
Throughout study completion, an average of 6 months
Title
PEQ-Well Being (PEQ-WB) - Measuring change from baseline
Description
The version of the PEQ which will be administered consists of 2 questions in 1 category (well being). For purposes of easier administration, the investigators have adopted the modified 10-point ordinal scale version of the PEQ-WB (scale 1-10, where 1 is the worst and 10 is the best relative to the questions being asked). This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.
Time Frame
Throughout study completion, an average of 6 months
Secondary Outcome Measure Information:
Title
Six Minute Walk Test (6MWT) - Measuring change from baseline
Description
The 6MWT is a sub-maximal exercise test used to assess walking endurance and aerobic capacity. Participants will walk a set circuit for a total of six minutes. The distance covered over a time of 6 minutes is used as the outcome by which to compare changes in performance capacity. This assessment may be performed at each site visit.
Time Frame
Throughout study completion, an average of 6 months
Title
Stair Assessment Index (SAI)
Description
The Stair Assessment Index (SAI) is an observational outcome measure designed to assess an individual's ability to ascend and descend stairs. The SAI is a 14-level ordinal scale that spans a functional continuum from choosing not to ascend or descend the stairs to a fully independent step-over-step stair gait. A SAI rating is independently assigned to the activities of stair ascent and stair descent. These ratings reflect the individual's degree of independence and quality of movement in stair gait. The 14 ratings of the SAI are based on several central characteristics of stair gait including the ability to perform the task, the need for assistance, the use of an assistive device, and the gait style chosen to perform the task. This assessment may be performed at each site visit.
Time Frame
Before and after each 3 month condition
Title
Hill Assessment Index (HAI)
Description
The Hill Assessment Index (HAI) is an observational outcome measure designed to assess an individual's ability to ascend and descend hills. The HAI is a 12-level ordinal scale that spans a functional continuum from choosing not to ascend or descend the specified incline or decline to a fully independent symmetric gait pattern. A HAI rating is independently assigned to the activities of hill ascent and descent. These ratings reflect the individual's degree of independence and the quality of movement. The 12 ratings of the HAI are based on several central characteristics of inclined gait, including the ability to perform the task, the need for assistance, the use of an assistive device, and the gait style chosen to perform the task. This assessment may be performed at each site visit.
Time Frame
Before and after each 3 month condition
Title
Timed Up and Go Test (TUG)
Description
The Timed Up and Go (TUG) may be used to measure physical mobility, assess fall risk, and predict prosthetic nonuse in patients with a lower-limb amputation who are using a prosthesis. In the timed up and go (TUG) test, subjects are asked to rise from a standard armchair, walk to a marker 3 m away, turn, walk back, and sit down again. The test is timed in seconds using a stopwatch. The test is a reliable and valid test for quantifying functional mobility that may also be useful in following clinical change over time. This assessment may be performed at each site visit.
Time Frame
Throughout study completion, an average of 6 months total.
Title
Patient Reported Outcomes Measures Information System - Physical Function (PROMIS-PF)
Description
The form being administered is PROMIS Physical Function short form 10b.PROMIS Physical Function (PROMIS PF) measures the outcome of patients or clients by assessing physical function through a grading scale of activities of daily living. PROMIS PF is used as an outcome in research on the effectiveness of interventions. The questions are answered on a scale from 1-5, with 1 being 'unable to do' and 5 being 'able to do without difficulty', pertaining to an activity. This survey will be administered as a part of the master questionnaire.
Time Frame
Before and after each 3 month condition
Title
PLUS-M Version 3.0 - Measuring change from baseline
Description
This version of the PLUS-M is a 12 item short form. Responses are scored from 1-5, with 1 being 'unable to do' and 5 being 'without any difficulty', pertaining to an activity. The scores will be added together to make the 'raw score', which can then be translated to T-score, Standard Error, and percentile. This survey will be given at the beginning and end of each study condition (2 conditions, 3 months per condition). Additionally, this survey will be given at the subject's last training session, which is dependent on the subject's scheduling availability and proficiency with each knee condition. The subject will have between 2-8 training sessions per condition until deemed proficient or the 8th session has been completed, whichever comes first. All training sessions are expected to be completed within the first month of each condition. This survey will be administered as a part of the master questionnaire.
Time Frame
Throughout study completion, an average of 6 months total.
Title
Borg Rating of Perceived Exertion (RPE)
Description
The Borg Rating of Perceived Exertion (RPE) is a way of measuring physical activity intensity level. Perceived exertion is how hard the participant feels like their body is working. The original scaling is from 6-20, corresponding to approximate heart rate (x10 beats per minute). The investigators will be using the adapted Borg CR10 scale, which scales from 0-10 (0=no exertion at all, 10=maximal exertion).
Time Frame
Before and after each 3 month condition
Title
Physiological Cost Index (PCI)
Description
The PCI uses heart rate to indicate the energy cost of walking. The 3 items needed to calculate this measure are resting heart rate, working heart rate, and walking speed. PCI = (Working HR - Resting HR) / Walking Speed. Heart rate and walking speed will be collected and calculated for the 6MWT.
Time Frame
Before and after each 3 month condition
Title
Patient Reported Outcomes Measures Information System - Fatigue (PROMIS-FAT)
Description
The form being administered is PROMIS Fatigue short form 8a. The PROMIS Fatigue item banks assess a range of self-reported symptoms, from mild subjective feelings of tiredness to an overwhelming, debilitating, and sustained sense of exhaustion that likely decreases one's ability to execute daily activities and function normally in family or social roles. Fatigue is divided into the experience of fatigue (frequency, duration, and intensity) and the impact of fatigue on physical, mental, and social activities. The fatigue short forms are universal rather than disease-specific. All assess fatigue over the past seven days. The questions are answered on a scale from 1-5, with 1 being "not at all" or "never", and 5 being "very much" or "always". This survey will be administered as a part of the master questionnaire.
Time Frame
Before and after each 3 month condition
Title
Self reported falls
Description
A digital fall questionnaire will be delivered at most weekly through a HIPAA secure system to the patient's phone. This questionnaire has been used in the past by Hanger. If the subject responds positively that they had a fall, follow up questions may be asked to get more specific details. The subject may be asked to provide additional notes periodically to document their problems, experiences, and feedback.
Time Frame
Before and after each 3 month condition
Title
Patient Reported Outcomes Measures Information System - 29 (PROMIS-29)
Description
The PROMIS-29 is a short form assessment containing four items from each of seven PROMIS domains (Depression, Anxiety, Physical Function, Pain Interference, Fatigue, Sleep Disturbance, and Ability to Participate in Social Roles and Activities) which are all scaled from 1-5, plus one pain intensity question (0-10 numeric rating scale). This survey will be administered as a part of the master questionnaire.
Time Frame
Before and after each 3 month condition
Title
Oswestry Disability Index (ODI)
Description
The Oswestry Disability Index is a tool that researchers and disability evaluators use to measure a patient's permanent functional disability. The patient is asked 10 questions, each with 6 possible answers. The answers are scored 0-5. The total score corresponds to disability level (no disability, mild disability, moderate disability, severe disability, completely disabled). This survey will be administered as a part of the master questionnaire.
Time Frame
Before and after each 3 month condition
Title
Patient Reported Outcomes Measures Information System - Ability to Participate in Social Roles and Activities (PROMIS-APSRA)
Description
The PROMIS-APSRA is a short form that assesses an individual's perceived ability to perform their usual social roles and activities. The form being administered is PROMIS-APSRA short form 8a. The questions are answered on a scale from 1-5, with 1 being "never", and 5 being "always". This survey will be administered as a part of the master questionnaire.
Time Frame
Before and after each 3 month condition

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Are at least 18 years old Unilateral transfemoral prosthesis user (limb absence between the knee and hip) Current user of a microprocessor-controlled knee (MPK) Have adequate clearance between distal end and ground for necessary knee and foot components Medicare Functional Classification Level (K-Level): 4 Socket-Comfort Score: 6 or above to ensure adequate socket fit PLUS-M T-score of 55 or above Six months or more experience on a prosthesis Body weight between 50kg and 116kg (110lbs - 256lbs) Exclusion Criteria: Present injuries to residual limb or contralateral leg affecting functional ability Socket issues/changes in the last 6 weeks Users with bone-anchored implants Subjects can be excluded at the discretion of the investigator for other unforeseen disqualifying criteria (such as specific cognitive issues, etc.). Subjects in this study will not be discriminated by sex/gender or race/ethnicity. Using a knee that the subject is unfamiliar with may increase the risk of falling. Therefore, pregnant women should not participate in the study and will be screened by self-disclosure.
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Shane Wurdeman, PhD
Phone
402-290-8051
Email
swurdeman@hanger.com
First Name & Middle Initial & Last Name or Official Title & Degree
Jen Johansson, MS
Phone
774-233-0874
Email
jen.johansson@liberatingtech.com
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Jennifer Johansson, MS
Organizational Affiliation
Liberating Technologies, Inc.
Official's Role
Principal Investigator
Facility Information:
Facility Name
Liberating Technologies, Inc.
City
Holliston
State/Province
Massachusetts
ZIP/Postal Code
01746
Country
United States
Individual Site Status
Not yet recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Jen Johansson, MS
Phone
774-233-0874
Email
jen.johansson@liberatingtech.com
First Name & Middle Initial & Last Name & Degree
Brianna Rozell, BS
Phone
508-737-2403
Email
brianna.rozell@liberatingtech.com
Facility Name
Hanger Clinic
City
Austin
State/Province
Texas
ZIP/Postal Code
78758
Country
United States
Individual Site Status
Recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Shane Wurdeman, PhD
Phone
402-290-8051
Email
swurdeman@hanger.com
First Name & Middle Initial & Last Name & Degree
Sophia Saenz
Phone
512-289-7253
Email
ssaenz@hanger.com

12. IPD Sharing Statement

Learn more about this trial

Clinical Outcomes With Passive MPKs vs. Powered Prosthetic Knees

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