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A Comparison Between Ischial-Containment and Sub-Ischial Prosthetic Sockets to Determine Their Effects on Secondary Health Conditions

12 августа 2026 г. обновлено: VA Office of Research and Development

Long-term above-knee prosthesis users are at an increased risk of developing secondary musculoskeletal conditions compared to the general able-bodied population. One secondary physical concern is low back pain (LBP), for which the development is not entirely understood, but in above-knee prosthesis users it is believed to relate to asymmetries and compensations that are typically demonstrated and required to stand and walk. Understanding spinal motion and compensations will enhance our knowledge of the factors contributing to LBP, and possibly lead to the development of new prosthetic and therapeutic interventions to prevent or alleviate LBP, thereby improving mobility and quality of life for prosthesis users.

Обзор исследования

Статус

Еще не набирают

Условия

Односторонняя трансфеморальная ампутация

Подробное описание

The purpose of this study is to investigate and compare the effects of the standard ischial containment (IC) socket to a sub-ischial (SI) socket design on the spinal and pelvic motions and leg length (LLD) discrepancies of transfemoral prosthesis users. Data will be collected from 2 groups of transfemoral prosthesis users (15 SI socket wearers and 15 IC socket wearers) and a group of 15 able-bodied (AB) control participants. Gait and standing analyses will be conducted on each participant using a marker based motion capture system. Prosthesis users will wear their own conventional sockets for the gait and standing analyses. Kinematic and kinetic data will be analyzed for differences between the 2 groups of socket wearers and will also be compared to the control group.

The specific aims and hypotheses of this project are:

Aim 1: To measure dynamic leg length and kinematics of the pelvis and spinal segments in unilateral, transfemoral prosthesis users during gait. Quantitative motion analyses will be performed on two groups of 15 research participants with lower limb amputation using 2 different socket designs (IC and SI) walking over level ground at three self-selected walking speeds (normal, moderately fast, fastest). Data will be compared between socket type and to an AB control group. Hypothesis 1a-IC socket wearers will have a greater anterior pelvic tilt compared to SI socket wearers and AB controls, and they will exhibit considerably greater rotations of the pelvis and spinal segments during walking. Hypothesis 1b-The EMG activity of the lumbar erector spinae for SI socket users will better approximate the patterns of AB controls as compared to IC socket wearers. Hypothesis 1c-The dynamic LLD will be greater for IC socket users compared to SI socket wearers and AB controls.

Aim 2: To measure pelvic orientation and static leg length in unilateral, transfemoral prosthesis users during standing. A multi-segment model of the spine and pelvis will be used to determine neutral spinal, pelvis, and prosthetic alignment during standing for the research and AB control participants. Hypothesis 2a-IC socket wearers will demonstrate greater anterior pelvic tilt during standing compared to SI socket wearers and control participants. Hypothesis 2b-The prosthetic and sound leg lengths for both prosthesis user groups will be within 1.0 cm of each other during standing.

Aim 3: To estimate joint contact forces in the legs and lower back of unilateral, transfemoral prosthesis users and controls during gait. Computational musculoskeletal simulations will be used to comprehensively evaluate the data from Aim 1 to compare the lumbar joint loads between IC and SI socket wearers. Hypothesis 3-IC socket wearers will exhibit greater lumbar joint loads than SI socket wearers.

Тип исследования

Наблюдательный

Регистрация (Оцененный)

Контакты и местонахождение

В этом разделе приведены контактные данные лиц, проводящих исследование, и информация о том, где проводится это исследование.

Контакты исследования

Имя: Rebecca Stine, MS
Номер телефона: (312) 503-5726
Электронная почта: rebecca.stine@va.gov

Учебное резервное копирование контактов

Имя: Steven A Gard, PhD
Номер телефона: (312) 503-5718
Электронная почта: steven.gard@va.gov

Места учебы

Соединенные Штаты
- Illinois
  - Chicago, Illinois, Соединенные Штаты, 60612
    - Jesse Brown VA Medical Center, Chicago, IL
    - Контакт:
      
      Rebecca Stine, MS
      
      Номер телефона: (312) 503-5726
      
      Электронная почта: rebecca.stine@va.gov
    - Контакт:
      
      Steven A Gard, PhD
      
      Номер телефона: (312) 503-5718
      
      Электронная почта: steven.gard@va.gov
    - Главный следователь:
      
      Rebecca Stine, MS

Критерии участия

Исследователи ищут людей, которые соответствуют определенному описанию, называемому критериям приемлемости. Некоторыми примерами этих критериев являются общее состояние здоровья человека или предшествующее лечение.

Критерии приемлемости

Возраст, подходящий для обучения

Взрослый
Пожилой взрослый

Принимает здоровых добровольцев

Да

Метод выборки

Невероятностная выборка

Исследуемая популяция

Thirty unilateral transfemoral prosthesis users (15 with an ischial containment socket and 15 with a sub-ischial socket) and 15 able-bodied control participants.

Описание

Inclusion Criteria:

For all participants:

Ability to complete the experimental protocol without undue fatigue or health risks
Low Back Pain scale assessment (0-10) less than 4 (activities of daily living or quality of life not impacted)

In addition for persons with lower limb amputation:

Prosthesis user for a minimum of 2 years with their current socket design
Good fit with either an ischial containment (IC) or sub-ischial (SI) socket
Good skin integrity on their residual limb upon visual inspection
Does not require the use of assistive devices to walk

Exclusion Criteria:

Previously diagnosed with a spine condition (e.g., pinched nerve, bulging disc, etc.)
Previously diagnosed with an orthopedic or neuromuscular condition that may affect walking or balance (e.g., ankle fusion, Parkinson's disease, stroke, etc.)

Учебный план

В этом разделе представлена подробная информация о плане исследования, в том числе о том, как планируется исследование и что оно измеряет.

Как устроено исследование?

Детали дизайна

Количество групп / когорт

Когорты и вмешательства

Группа / когорта
Ischial Containment Socket user Person with unilateral transfemoral amputation wearing an ischial containment socket
Sub-Ischial Socket user Person with unilateral transfemoral amputation wearing a sub-ischial socket
Able-bodied control Person without an amputation

Что измеряет исследование?

Первичные показатели результатов

Мера результата	Мера Описание	Временное ограничение
Anterior Pelvic Tilt Angle Between the IC Socket wearers and the SI Socket wearers/Able-Bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	Anterior Pelvic Tilt will be calculated for all participants during the walking and standing trials. Participants will walk along a 10 meter walkway at varying speeds. Quantitative motion analysis using a marker based motion measurement system will be used to calculate anterior pelvic tilt.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe

Вторичные показатели результатов

Мера результата	Мера Описание	Временное ограничение
Electromyography (EMG) Activity of the Lumbar Erector Spinae Between the IC Socket wearers and the SI Socket wearers/Able-bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	EMG activity will be assessed using surface electrodes attached bilaterally to the erector spinae at and below T12/L1 and on the external oblique muscle. Data will be collected during the quantitative motion analysis.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe
Lumbar Flexion Between the IC Socket wearers and the SI Socket wearers/Able-bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	Lumbar flexion will be calculated for all participants during the walking and standing trials. Participants will walk along a 10 meter walkway at varying speeds. Quantitative motion analysis using a marker based motion measurement system will be used to calculate anterior pelvic tilt.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe
Hip Joint Range of Motion (ROM) between the IC Socket wearers and the SI Socket wearers/Able-bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	Hip Joint ROM will be calculated for all participants during the walking trials. Participants will walk along a 10 meter walkway at varying speeds. Quantitative motion analysis using a marker based motion measurement system will be used to calculate hip joint ROM.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe
Dynamic Leg Length Discrepancy (LLD) Between the IC Socket wearers and the SI Socket wearers/Able-bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	Dynamic LLD will be calculated for all participants during the walking trials. Participants will walk along a 10 meter walkway at varying speeds. Quantitative motion analysis using a marker based motion measurement system will be used to calculated dynamic LLD.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe
Peak Lumbar Joint Loading Between the IC Socket wearers and the SI Socket wearers/Able-bodied Controls Временное ограничение: To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe	Lumbar joint loading during walking will be analyzed by performing musculoskeletal modeling simulations using data collected during the quantitative motion analysis.	To be measured on day 1 of the single study visit, within an estimated 3-hour timeframe

Соавторы и исследователи

Здесь вы найдете людей и организации, участвующие в этом исследовании.

Спонсор

VA Office of Research and Development

Следователи

Главный следователь: Rebecca Stine, MS, Jesse Brown VA Medical Center, Chicago, IL

Даты записи исследования

Эти даты отслеживают ход отправки отчетов об исследованиях и сводных результатов на сайт ClinicalTrials.gov. Записи исследований и сообщаемые результаты проверяются Национальной медицинской библиотекой (NLM), чтобы убедиться, что они соответствуют определенным стандартам контроля качества, прежде чем публиковать их на общедоступном веб-сайте.

Изучение основных дат

Начало исследования (Оцененный)

1 января 2027 г.

Первичное завершение (Оцененный)

1 июля 2030 г.

Завершение исследования (Оцененный)

31 декабря 2030 г.

Даты регистрации исследования

Первый отправленный

4 августа 2026 г.

Впервые представлено, что соответствует критериям контроля качества

12 августа 2026 г.

Первый опубликованный (Действительный)

17 августа 2026 г.

Обновления учебных записей

Последнее опубликованное обновление (Действительный)