NU-FlexSIS Prosthetic Socket for Leg Amputation

Not currently recruiting at 2 trial locations
RS
KG
SF
Overseen ByStefania Fatone, PhD
No Placebo GroupAll trial participants will receive the active study treatment (no placebo)
Approved in 1 JurisdictionThis treatment is already approved in other countries

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial tests a new type of prosthetic leg socket called the NU-FlexSIS, designed to enhance comfort and mobility for individuals with an above-knee amputation. Researchers aim to determine if this new socket outperforms the current standard, the ischial containment socket, in terms of wear time, overall mobility, and quality of life. Participants will either continue with their regular socket or switch to the new socket for evaluation. The trial seeks individuals who have had a transfemoral amputation, have used a prosthetic leg for at least a year, and experience limited mobility. As an unphased trial, this study offers a unique opportunity to contribute to advancements in prosthetic technology and potentially improve personal mobility and comfort.

Do I have to stop taking my current medications for this trial?

The trial protocol does not specify whether you need to stop taking your current medications. It seems focused on prosthetic use, so it's unlikely that medication changes are required.

Will I have to stop taking my current medications?

The trial information does not specify whether you need to stop taking your current medications. It is best to discuss this with the trial coordinators or your doctor.

What prior data suggests that the NU-FlexSIS prosthetic socket is safe for individuals with leg amputation?

Research shows that the Northwestern University Flexible Subischial Suction Socket (NU-FlexSIS) is generally well-received by patients. Studies have found that this socket design makes it more comfortable and easier for people with above-knee amputations to move. Users have shared positive experiences about how the socket feels and aids their mobility.

In earlier studies, patients reported feeling more comfortable, stable, and able to move better with the NU-FlexSIS. These benefits suggest that the socket design is safe and user-friendly. No serious problems related to the socket have been reported, indicating its safety.

Although the studies do not specifically focus on safety, the positive feedback about comfort and ease of use suggests that users manage the socket well.12345

Why are researchers excited about this trial?

Researchers are excited about the NU-FlexSIS Prosthetic Socket because it offers a novel approach to prosthetic fitting for individuals with leg amputations. Traditional prosthetic sockets often use ischial containment designs, which can be uncomfortable and restrictive. In contrast, the NU-FlexSIS socket utilizes a flexible subischial suction system, allowing for greater comfort and mobility. This innovative design aims to improve the overall quality of life for users by reducing pressure and increasing range of motion, which could lead to more natural movement and enhanced daily activity.

What evidence suggests that the NU-FlexSIS prosthetic socket is effective for improving comfort and mobility in individuals with leg amputation?

Research shows that the Northwestern University Flexible Subischial Suction Socket (NU-FlexSIS) offers a promising option for people with leg amputations. Studies have found this socket design to be more comfortable than traditional ischial containment sockets. It aims to improve comfort and allow for better movement, potentially enhancing mobility and quality of life. Previous evaluations, including walking tests and comfort ratings, suggest that users of the NU-FlexSIS socket experience similar function with added comfort. In this trial, participants in the intervention group will transition from their usual ischial containment socket to the NU-FlexSIS socket to assess its impact on comfort and mobility. This innovative design appears to provide a more comfortable fit for those with above-knee amputations.12467

Who Is on the Research Team?

SF

Stefania Fatone, PhD

Principal Investigator

University of Washington

Are You a Good Fit for This Trial?

This trial is for adults over 18 with a below-knee amputation who have been using a prosthesis for at least a year. They should be able to perform limited community walking, use their upper limbs, and manage technology like computers or smartphones. Veterans are specifically included at VA sites. Participants must not plan to change their prosthetic knee or foot soon and cannot have certain health conditions like active cancer.

Inclusion Criteria

Provision of signed and dated informed consent form
Be a Veteran (VA site only)
Speak and read English
See 9 more

Exclusion Criteria

Have a known silicone allergy
Are unable to don or tolerate wearing a compressive liner
I currently have cancer.
See 4 more

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

2-4 weeks
1 visit (in-person)

Baseline Assessment

Participants are assessed in their usual ischial containment socket

12 weeks
Multiple visits (in-person and remote)

Intervention

Participants receive and are assessed with the subischial socket

24 weeks
8 visits (in-person), 11 remote survey assessments

Monitoring

Reference group participants are monitored with their usual socket

40 weeks
8 remote survey assessments

Follow-up

Participants are monitored for safety and effectiveness after treatment

4 weeks

What Are the Treatments Tested in This Trial?

Interventions

  • Northwestern University Flexible Subischial Suction Socket (NU-FlexSIS)
Trial Overview The study is testing the NU-FlexSIS, which is a new type of socket for leg prostheses designed to improve comfort and mobility compared to the standard socket used after thigh-level leg amputations. The goal is to see if this new design enhances quality of life, increases how long the prosthesis can be worn daily, and improves overall satisfaction.
How Is the Trial Designed?
2Treatment groups
Experimental Treatment
Active Control
Group I: Intervention GroupExperimental Treatment1 Intervention
Group II: Reference GroupActive Control1 Intervention

Northwestern University Flexible Subischial Suction Socket (NU-FlexSIS) is already approved in United States for the following indications:

🇺🇸
Approved in United States as NU-FlexSIV for:

Find a Clinic Near You

Who Is Running the Clinical Trial?

University of Washington

Lead Sponsor

Trials
1,858
Recruited
2,023,000+

Congressionally Directed Medical Research Programs

Collaborator

Trials
59
Recruited
10,600+

Published Research Related to This Trial

The Hybrid Subischial Socket (HySS) significantly improved comfort and various gait parameters in three participants with transfemoral amputation after one month of use, compared to their usual Ischial Containment Socket (ICS).
Participants experienced enhanced hip range-of-motion, increased walking speed and distance, and greater satisfaction with the prosthesis, indicating that HySS may be a beneficial alternative for prosthetic users.
The Hybrid Subischial Socket for Persons With Transfemoral Amputation: Gait Parameters and Clinical Assessment of a Case Series.Pellegrini, R., Denza, G., Brunelli, S., et al.[2023]
The development of a passive suction version of the Northwestern University Flexible Sub-Ischial Vacuum socket allows for a broader application of this technology to more individuals with transfemoral amputations, especially in situations where active vacuum suspension is not feasible.
From January 2015 to March 2018, 266 of these passive suction sockets were successfully fitted, demonstrating the effectiveness of the technique modifications required for casting and fabricating this new socket design.
Technique modifications for a suction suspension version of the Northwestern University Flexible Sub-Ischial Vacuum socket: The Northwestern University Flexible Sub-Ischial Suction socket.Caldwell, R., Fatone, S.[2022]
The Northwestern University Flexible Subischial Vacuum (NU-FlexSIV) Socket was found to be significantly more comfortable than the ischial containment (IC) socket after 7 weeks of use, with a mean Socket Comfort Score of 8.4 compared to 7.0 for the IC socket.
Participants using the NU-FlexSIV Socket reported greater satisfaction with their device, although other functional performance measures showed no significant differences between the two socket types.
Comparison of Ischial Containment and Subischial Sockets on Comfort, Function, Quality of Life, and Satisfaction With Device in Persons With Unilateral Transfemoral Amputation: A Randomized Crossover Trial.Fatone, S., Caldwell, R., Angelico, J., et al.[2022]

Citations

Northwestern University Flexible Subischial Vacuum ...Socket comfort improved for both subjects with comparable function compared to ischial containment sockets. Keywords: Artificial limb, prosthetic socket, gait, ...
Functional Performance Evaluation of NU-FlexSIV SocketThe Northwestern University Flexible Sub-Ischial Vacuum Socket is a novel socket design for transfemoral amputees. Intervention/Treatment, Device : Northwestern ...
NU-FlexSIS Prosthetic Socket for Leg AmputationThe objective of this trial is to assess use and benefits of the subischial socket for persons with transfemoral amputation and lower mobility levels.
(PDF) Northwestern University Flexible Subischial Vacuum ...Testing included gait analysis, socket comfort score, and performance-based clinical outcome measures (Rapid-Sit-To-Stand, Four-Square-Step-Test ...
5.pubmed.ncbi.nlm.nih.govpubmed.ncbi.nlm.nih.gov/28094686/
Northwestern University Flexible Subischial Vacuum ...The NU-FlexSIV socket is a more comfortable, teachable subischial socket for transfemoral amputations, designed to improve comfort and range of ...
(PDF) Northwestern University Flexible Subischial Vacuum ...Results: Patient models responded positively to the comfort, range of motion, and stability of the new socket while prosthetists described the technique as " ...
Transfemoral Socket Design and Muscle FunctionThe objective of this pilot research project is to evaluate the effect of prosthetic socket design on amputated limb hip muscle strength and endurance in ...
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