Long Term Clinical Evaluation of SLS Transtibial Sockets

Diabetes Clinical Trial

Official title:

Long Term Clinical Evaluation of SLS Transtibial Sockets

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00167570
• Other study ID #: VA-A2755-r-UT-001-0011-267
• Secondary ID: VA-A2755-r
• Status: Completed
• Phase: N/A
• First received: September 9, 2005
• Last updated: April 24, 2017
• Start date: April 2003
• Est. completion date: July 2011

Study information

• Verified date: September 2012
• Source: The University of Texas Health Science Center at San Antonio
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The overall long-term goal of this project is the development of a clinically practical system for rapid prosthetic limb provision that integrates computer-aided design with solid freeform fabrication techniques. This proposal builds on our previous successful demonstration of the feasibility of SFF socket fabrication and will address several key issues that underlie its clinical viability. The specific objectives of the proposed work are:

1. To develop improved designs for SFF transtibial prosthetic sockets that allow the use of industry standard pylon mounts and incorporate variable compliance elements.

2. Determine the clinical effectiveness of variable wall compliance elements in enhancing the comfort and fit of transtibial prosthetic sockets.

3. Determine the durability and functionality of SFF sockets during extended clinical use.

These objectives will be met over a three-year period. The initial phase of the proposed work will use an iterative engineering design - modeling - evaluation process to develop variable compliance elements and an industry standard pylon mount adapter. During the second phase of the proposed work, clinical evaluations of SFF prosthetic sockets will be studied. The effectiveness of variable compliant elements in enhancing comfort and fit will be determined using a within subject case comparison study of SFF sockets with conventional laminated sockets. Durability of SFF sockets that incorporate an industry standard pylon mounting system will be determined during a 12-month clinical field trial.

Description:

Successful rehabilitation for the majority of lower extremity amputees includes prosthetic limb fitting and training. Critical to the success of prosthetic fitting is a comfortable, well fitting socket. Accomplishing this remains a clinical challenge with residual limb pain and socket discomfort affecting 20-55% of lower limb amputees. Achieving an acceptable socket fit using conventional prosthetic techniques requires individual custom molding and fabrication in a labor intensive, costly process. Alternative methods of fabricating prosthetic sockets that can improve efficiency in prosthetic provision, enhance comfort and fit, or reduce cost are needed to ensure the continued optimal rehabilitation of the amputee. This project will continue the development of a new promising method of socket fabrication using solid freeform fabrication (SFF) based on selective laser sintering (SLS) technology. SFF allows the direct manufacture of a prosthetic socket without the intermediate molds and laminating process required with conventional techniques.

The overall long-term goal of this project is the development of a clinically practical system for rapid prosthetic limb provision that integrates computer-aided design with solid freeform fabrication techniques. This proposal builds on our previous successful demonstration of the feasibility of SFF socket fabrication and will address several key issues that underlie its clinical viability. The specific objectives of the proposed work are:

1. To develop improved designs for SFF transtibial prosthetic sockets that allow the use of industry standard pylon mounts and incorporate variable compliance elements.

2. Determine the clinical effectiveness of variable wall compliance elements in enhancing the comfort and fit of transtibial prosthetic sockets.

3. Determine the durability and functionality of SFF sockets during extended clinical use.

These objectives will be met over a three-year period. The initial phase of the proposed work will use an iterative engineering design - modeling - evaluation process to develop variable compliance elements and an industry standard pylon mount adapter. During the second phase of the proposed work, clinical evaluations of SFF prosthetic sockets will be studied. The effectiveness of variable compliant elements in enhancing comfort and fit will be determined using a within subject case comparison study of SFF sockets with conventional laminated sockets. Durability of SFF sockets that incorporate an industry standard pylon mounting system will be determined during a 12-month clinical field trial.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 11
• Est. completion date: July 2011
• Est. primary completion date: July 2011
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

All subjects will be lower extremity amputees of at least one year duration and are 18 years of age or older.

They must meet the Medicare Functional Classification Level K2 or K3 class for prosthetic use (unlimited household or limited community level ambulator).

Exclusion Criteria:

There must be no current stump wounds or breakdown or a history of repeated skin breakdown with adequately fitting prostheses.

Related Conditions & MeSH terms

• Diabetes
• Trauma

Intervention

Device:
• Prosthetic socket fabricated using selective laser sintering

Locations

Country	Name	City	State
United States	South Texas Veterans Healthcare System	San Antonio	Texas

Sponsors (1)

Lead Sponsor	Collaborator
The University of Texas Health Science Center at San Antonio

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Durability during household and community mobility.	Subjects were followed for up to 12 months in 3 months intervals for examination of the physical condition of socket and for subject gait assessment with socket	Up to 12 months
Secondary	User perceptions of comfort, fit, and function.	Subjects were followed up at 3 month intervals and assessed for comfort fit and function	Up to 12 months