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Biomechaniczna ocena stawu kolanowego Ossur Power u osób po amputacji przezudowej (OPKTFA)

17 września 2026 zaktualizowane przez: VA Office of Research and Development

Czy protezy przezudowe ze wspomaganym zgięciem i wyprostem stawu kolanowego poprawiają mobilność? Biomechaniczna ocena stawu kolanowego Ossur

Microprocessor-controlled knees (MPKs) do not typically utilize motors to power joint rotation, but they automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the prosthesis user during gait. The Ossur Power Knee is the only commercially-available MPK that uses a motor to provide active power generation during walking and other activities. The purpose of this proposed investigation is to perform and compare biomechanical evaluations of the Power Knee and Ossur Rheo XC, a passive MPK, during walking and other activities by prosthesis users. Furthermore, mobility between male and female subjects will be compared to determine if there are differences in prosthetic knee usage on the basis of sex.

Przegląd badań

Status

Rekrutacyjny

Warunki

Interwencja / Leczenie

Szczegółowy opis

The anatomical knee is a complex, polycentric joint characterized by a large range of motion in the sagittal plane and limited mobility in the coronal and transverse planes. The sagittal plane motion is used for progression in stance phase, and limb clearance and advancement in swing. Limb prostheses are intended to restore function and cosmesis in persons with limb loss. The complexity and function of prosthetic components have advanced significantly as technology has improved, but a state-of-the-art artificial limb is still a relatively poor substitute for an anatomical one. Microprocessor-controlled knees (MPKs) do not typically utilize motors to power joint rotation, but they automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the user during gait. The Ossur Power Knee, which was first introduced in 2006, is the only MPK that uses a motor to provide active power generation during walking and other activities involving knee flexion and extension. Last year, Ossur released the 3rd generation of its Power Knee and appears to have addressed many of the previous shortcomings in terms of reduced weight, less noise, lower cost and longer battery life. Therefore, the newest version of the Power Knee warrants a fresh evaluation since it is, in essence, substantially different in design and function from previous models.

The purpose of this proposed investigation is to perform biomechanical evaluations of the new Ossur Power Knee during walking and other activities by transfemoral prosthesis users. Using a cross-over experimental design, approximately 20 unilateral, transfemoral amputee subjects (10 men and 10 women) will be evaluated in the Jesse Brown VAMC Motion Analysis Research Laboratory (MARL) while wearing the Ossur Power Knee and Ossur Rheo XC, which is a passive MPK device. Furthermore, the Ossur Power Knee may offer distinct advantages to female prosthesis users, so mobility will be compared between men and women to determine if differences exist on the basis of sex. The specific aims and hypotheses of this project are:

Aim 1: To compare the effects of the Ossur Power Knee and Ossur Rheo XC on the gait of unilateral, transfemoral prosthesis users during level walking. Kinematic and kinetic data will be collected as subjects walk in the MARL. Hypothesis--the active knee flexion and extension provided by the Ossur Power Knee will (1) improve walking performance, and (2) reduce metabolic energy cost during ambulation.

Aim 2: To compare the effects of the Ossur Power Knee and Ossur Rheo XC on stairs, slopes and during sit-to-stand/stand-to-sit activities of unilateral, transfemoral prosthesis users. Kinematic data will be collected as subjects perform these activities. Hypothesis--subjects will have improved performance when using the Ossur Power Knee.

Aim 3: To analyze and compare gender specific data between subjects using the Ossur Power Knee and the Ossur Rheo XC. Hypothesis--male and female subjects will demonstrate substantially different abilities to use the two knee components, indicating that gender specific components should be further investigated and developed. Research focusing on the unique prosthetic needs of women Veterans is currently a special emphasis area of the VA RR&D Service.

Subjects will also be administered questionnaires and provided at-home diaries to document their perceptions of comfort, exertion and stability while using the different prosthetic knee units.

The repeated-measures, cross-over protocol design enables each subject to serve as their own control, and it will be determined whether statistically significant changes occur in their performance measures. A two-way mixed-methods ANOVA will be used to assess the main and interaction effects of sex (male, female) and knee type (Ossur Power Knee, Rheo XC). As a conservative approach, a Bonferroni correction will be used to account for the family-wise Type I error rate because multiple outcomes will be used to address each hypothesis.

Increased understanding about how the Ossur Power Knee affects the abilities of transfemoral prosthesis users will facilitate appropriate component selection by prosthetists and ultimately improve quality of life for prosthesis users.

Typ studiów

Interwencyjne

Zapisy (Szacowany)

20

Faza

  • Nie dotyczy

Kontakty i lokalizacje

Ta sekcja zawiera dane kontaktowe osób prowadzących badanie oraz informacje o tym, gdzie badanie jest przeprowadzane.

Kontakt w sprawie studiów

Kopia zapasowa kontaktu do badania

Lokalizacje studiów

    • Illinois
      • Chicago, Illinois, Stany Zjednoczone, 60612
        • Rekrutacyjny
        • Jesse Brown VA Medical Center, Chicago, IL
        • Kontakt:
        • Główny śledczy:
          • Steven A Gard, PhD
        • Kontakt:

Kryteria uczestnictwa

Badacze szukają osób, które pasują do określonego opisu, zwanego kryteriami kwalifikacyjnymi. Niektóre przykłady tych kryteriów to ogólny stan zdrowia danej osoby lub wcześniejsze leczenie.

Kryteria kwalifikacji

Wiek uprawniający do nauki

45 lat do 75 lat (Dorosły, Starszy dorosły)

Akceptuje zdrowych ochotników

Nie

Płeć kwalifikująca się do nauki

Wszystko

Opis

Inclusion Criteria:

  • Unilateral, transfemoral amputation (any etiology)
  • Residual limb length classified as standard (i.e., medium) to long
  • Prosthesis user for at least 1 year prior to enrolling in the study
  • K3 or K4 level ambulator
  • Good sensation on their residual limb(s) (upon routine clinical examination)
  • Good skin integrity upon visual inspection
  • Does not require the use of assistive devices to walk for short distances
  • Not currently taking medications that are known to affect balance or gait
  • Presents with good socket fit based upon a standard assessment by the study prosthetist

Exclusion Criteria:

  • Bilateral amputations
  • Individuals with a knee disarticulation

Plan studiów

Ta sekcja zawiera szczegółowe informacje na temat planu badania, w tym sposób zaprojektowania badania i jego pomiary.

Jak projektuje się badanie?

Szczegóły projektu

  • Główny cel: Leczenie
  • Przydział: Randomizowane
  • Model interwencyjny: Zadanie krzyżowe
  • Maskowanie: Brak (otwarta etykieta)

Broń i interwencje

Grupa uczestników / Arm
Interwencja / Leczenie
Eksperymentalny: Ossur Power Knee

Subjects will be fitted with the Ossur Power Knee, which has powered flexion and extension.

Subjects will be fitted and trained on the Ossur Power Knee. An accommodation of 1 month will be provided prior to evaluation with the knee joint.

Inne nazwy:
  • Mocne kolano Ossura
Aktywny komparator: Ossur Rheo XC Knee

Subjects will be fitted with the Ossur Rheo XC Knee, which is a conventional microprocessor-controlled prosthetic knee joint that modulates the amount of damping during flexion and extension.

Subjects will be fitted and trained on the Ossur Rheo XC Knee. An accommodation of 1 month will be provided prior to evaluation with the knee joint.

Inne nazwy:
  • Ossur Rheo

Co mierzy badanie?

Podstawowe miary wyniku

Miara wyniku
Opis środka
Ramy czasowe
Walking speed
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Walking speed will be measured as participants walk on level ground at slow, normal and fast speeds.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component
Metabolic energy cost
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

The metabolic energy rate will be measured as subjects walk at their freely selected speed on a level treadmill, which will be converted to metabolic energy cost (energy expended per unit distance).

To be measured after the 1-month accommodation period of wearing each prosthetic knee component
Sit-to-stand/stand-to-sit symmetry
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Knee kinematics and load distribution between the sound and prosthetic sides will be measured as participants stand up and sit down in a chair.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Miary wyników drugorzędnych

Miara wyniku
Opis środka
Ramy czasowe
Step length
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

The step lengths of the sound and prosthetic sides will be measured as participants walk on level ground at slow, normal and fast speeds.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component
Toe clearance during swing phase
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Toe clearance during swing phase on the prosthetic side will be measured as participants walk on level ground at slow, normal and fast speeds.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component
Sound leg loading rate
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

The sound leg loading rate during walking will be measured as participants walk on level ground at slow, normal and fast speeds.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component
Kinematics of pelvic motion
Ramy czasowe: To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Pelvic tilt, rotation and obliquity will be measured as participants walk on level ground at slow, normal and fast speeds.

To be measured after the 1-month accommodation period of wearing each prosthetic knee component

Współpracownicy i badacze

Tutaj znajdziesz osoby i organizacje zaangażowane w to badanie.

Sponsor

Śledczy

  • Główny śledczy: Steven A Gard, PhD, Jesse Brown VA Medical Center, Chicago, IL

Daty zapisu na studia

Daty te śledzą postęp w przesyłaniu rekordów badań i podsumowań wyników do ClinicalTrials.gov. Zapisy badań i zgłoszone wyniki są przeglądane przez National Library of Medicine (NLM), aby upewnić się, że spełniają określone standardy kontroli jakości, zanim zostaną opublikowane na publicznej stronie internetowej.

Główne daty studiów

Rozpoczęcie studiów (Rzeczywisty)

1 kwietnia 2024

Zakończenie podstawowe (Szacowany)

31 stycznia 2027

Ukończenie studiów (Szacowany)

31 marca 2027

Daty rejestracji na studia

Pierwszy przesłany

11 stycznia 2024

Pierwszy przesłany, który spełnia kryteria kontroli jakości

11 stycznia 2024

Pierwszy wysłany (Rzeczywisty)

23 stycznia 2024

Aktualizacje rekordów badań

Ostatnia wysłana aktualizacja (Rzeczywisty)

22 września 2026

Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości

17 września 2026

Ostatnia weryfikacja

1 września 2026

Więcej informacji

Terminy związane z tym badaniem

Inne numery identyfikacyjne badania

  • A4541-R
  • RX004541-01A2 (Inny numer grantu/finansowania: VA RRD)
  • 5I01RX004541-02 (Grant/umowa NIH USA)

Plan dla danych uczestnika indywidualnego (IPD)

Planujesz udostępniać dane poszczególnych uczestników (IPD)?

NIE

Opis planu IPD

A Limited Dataset (LDS) will be created and shared pursuant to a Data Use Agreement (DUA) appropriately limiting use of the dataset and prohibiting the recipient from identifying or re-identifying (or taking steps to identify or re-identify) any individual whose data are included in the dataset. Results from this study will be freely disseminated via presentations at professional conferences and publications in scientific journals. Additionally, data acquired for this project will be shared with those investigators who make a formal request to the PI and can demonstrate a legitimate and justifiable cause for utilization of such data. All requests for these data will be discussed with the VA scientific program manager.

Informacje o lekach i urządzeniach, dokumenty badawcze

Bada produkt leczniczy regulowany przez amerykańską FDA

Nie

Bada produkt urządzenia regulowany przez amerykańską FDA

Nie

produkt wyprodukowany i wyeksportowany z USA

Nie

Te informacje zostały pobrane bezpośrednio ze strony internetowej clinicaltrials.gov bez żadnych zmian. Jeśli chcesz zmienić, usunąć lub zaktualizować dane swojego badania, skontaktuj się z register@clinicaltrials.gov. Gdy tylko zmiana zostanie wprowadzona na stronie clinicaltrials.gov, zostanie ona automatycznie zaktualizowana również na naszej stronie internetowej .