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Enhancing Voluntary Motion in Broad Patient Populations With Modular Powered Orthoses Renewal

22 giugno 2026 aggiornato da: Robert D Gregg, University of Michigan
The overall goal of this project is to establish a novel design and control paradigm for modular, partial-assist powered orthoses (exoskeletons) to enhance voluntary lower-limb motion and manage pain in broad patient populations. Building upon a previous study period that addressed weakness from advanced age or muscle fatigue, this current period extends the technology to novel powered unloader orthoses designed to manage knee osteoarthritis (OA) pain. The investigators hypothesize that by providing 15-30% of biological joint torque, these motorized devices can reduce muscular contributions to painful loads on the joint's surfaces during activities of daily living (ADLs). The project aims to develop a task-agnostic, neural network-based controller and establish the feasibility of reducing knee pain and muscle effort in individuals with multi-compartment knee osteoarthritis.

Panoramica dello studio

Stato

Reclutamento

Condizioni

Intervento / Trattamento

Descrizione dettagliata

The overall goal of this project is to develop modular, lower-limb, powered orthoses that fit to user-specific joints and control torque in a manner that enhances voluntary motion and mitigates musculoskeletal pain. Commercial exoskeletons typically use actuation and control methods that force the human user to follow specific, rigid gait patterns. This has prevented emerging wearable robotics from effectively addressing the weakness and pain associated with mild to moderate impairments, such as knee osteoarthritis (OA). These populations require partial, task-agnostic assistance that works harmoniously with their voluntary motion rather than constraining it.

To bridge this gap, this project utilizes a quasi-direct drive actuation paradigm, a high-torque motor combined with a low-ratio transmission, integrated into conventional knee stabilizer and unloader braces. This hardware is uniquely capable of producing large output torques without causing perceptible resistance when backdriven by the human joint. To control the device across various activities of daily living (ADLs) without requiring pre-programmed trajectories, the investigators are developing a neural network-based formulation of "energy shaping" (effectively combining virtual springs, dampers, and gravity/inertia compensation) trained on multi-activity human data.

The specific objectives of this study period are to:

  1. Integrate the modular quasi-direct drive actuator and miniaturized electronics into both a modified knee stabilizer brace and a modified unloader knee brace.
  2. Implement and validate the neural network-based energy shaping controller to provide task-agnostic, biomimetic torque assistance with able-bodied subjects.
  3. Establish the clinical feasibility of this technology in individuals with multi-compartment knee OA.

The investigators hypothesize that the biomimetic torque assistance provided by these motorized braces will significantly reduce quadriceps effort, knee joint moment loads, and subjective pain across ADLs.

Tipo di studio

Interventistico

Iscrizione (Stimato)

65

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Backup dei contatti dello studio

Luoghi di studio

  • Stati Uniti
    • Michigan
      • Ann Arbor, Michigan, Stati Uniti, 48109
        • Reclutamento
        • Rehab Lab
        • Contatto:
        • Investigatore principale:
          • Robert Gregg

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto
  • Adulto più anziano

Accetta volontari sani

Sì

Descrizione

Inclusion Criteria:

Inclusion criteria for able-bodied, young participants will be:

  • Aged between 18 to 65 years
  • Weigh less than 300 lbs (due to challenges in bracing heavier participants)
  • BMI < 40 (due to challenges in bracing heavier participants)

Inclusion criteria for knee osteoarthritis participants will be:

  • Aged between 30 to 85 years
  • Medical diagnosis of patellofemoral and tibiofemoral osteoarthritis
  • Patient reported pain ≥ 4 out of 10 during activities of daily life (to avoid floor effects)
  • Weigh less than 300 lbs (due to challenges in bracing heavier participants)
  • BMI < 40 (due to challenges in bracing heavier participants)
  • Ability to walk 6 minutes without assistance from a person (may use walking aid)
  • Ability to ascend/descend ramps and stairs with or without the use of handrails

Exclusion Criteria:

Exclusion criteria for able-bodied, young adult participants will be:

  • Pregnant (self-report)
  • Any significant neuromuscular or musculoskeletal disorder that would interfere with the study
  • Unable to walk for 20 minutes
  • History of any cardiovascular, vestibular, or visual diseases and/or impairments that may interfere with the study
  • Cognitive deficits that would impair their ability to give informed consent or impair their ability to follow simple instructions during the experiments. Cognitive deficits will be determined by a Mini-Mental State Examination (MMSE) score of <22.
  • Adults with a known allergy to medical grade tape

Exclusion criteria for knee osteoarthritis participants will be:

  • Pregnant (self-report)
  • Any recent lower-extremity fracture (within 6 months)
  • Significant limitation on knee joint range of motion
  • Significant neurological (e.g., stroke) or cardiovascular disorder that may affect the ability to walk
  • Advised by a physician not to walk or exercise
  • Uncontrolled hypertension or diabetes
  • Use of opioids
  • Cognitive deficits or visual impairment that would impair their ability to give informed consent or impair their ability to follow simple instructions during the experiments. Cognitive deficits will be determined by a Mini-Mental State Examination (MMSE) score of <22.
  • Adults with a known allergy to medical grade tape

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Altro
  • Assegnazione: N / A
  • Modello interventistico: Assegnazione di gruppo singolo
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Exoskeleton

Experimental: Exoskeleton

Participants in this arm of the study will perform various tasks while wearing the modular powered orthosis
Dispositivo: Ortesi motorizzata modulare
Questo studio esaminerà le ortesi modulari, per gli arti inferiori, alimentate che si adattano alle articolazioni indebolite specifiche dell'utente e controllano la forza/coppia in un modo che migliora il movimento volontario in un'ampia popolazione di pazienti. L'ipotesi centrale è che i sistemi motori a coppia elevata e bassa inerzia controllati con obiettivi energetici consentiranno alle ortesi motorizzate modulari di assistere parzialmente le articolazioni. I motori elettrici a coppia elevata combinati con trasmissioni minime possono essere ruotati liberamente (cioè azionati all'indietro) dalle articolazioni umane, consentendo l'uso di un metodo di controllo della coppia emergente chiamato modellamento dell'energia per ridurre il peso/inerzia percepiti del corpo durante qualsiasi movimento. Montando questi attuatori modulari su ortesi commerciali, questa tecnologia sarà facilmente prescritta/configurata dai medici.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Muscle effort
Lasso di tempo: Baseline and through study completion, an average of 2 months
Muscle activity will be measured by surface EMG electrodes, and EMG sites will be averaged by flexors and extensors. For each condition (no orthosis vs. powered orthosis), signals will be normalized by their peaks during the no-orthosis condition, and then averaged over cycle, repetitions, and tasks to obtain overall muscle effort (focusing on knee extension for the powered knee orthosis, hip extension and flexion for the powered hip orthosis, and ankle plantarflexion for the powered ankle orthosis).
Baseline and through study completion, an average of 2 months
Joint moment load
Lasso di tempo: Baseline and through study completion, an average of 2 months
Biological torques will be estimated by subtracting the assistive torques from the total joint torques computed via inverse dynamics (using OpenSim). Biological torques will be divided into flexion and extension. For each condition (no orthosis vs. powered orthosis), signals will be normalized by their peaks during the no-orthosis condition, and then averaged over cycle, repetitions, and tasks to obtain overall joint moment load (focusing on knee extension for the powered knee orthosis, hip extension and flexion for the powered hip orthosis, and ankle plantarflexion for the powered ankle orthosis).
Baseline and through study completion, an average of 2 months
Pain score
Lasso di tempo: Baseline and through study completion, an average of 2 months

The Knee Injury and Osteoarthritis Outcome Score (KOOS) will be used to assess perceived pain for a multi-activity circuit test and isolated activity tests.

The KOOS evaluates both short-term and long-term consequences of knee injury. It holds 42 items in 5 separately scored subscales; Pain, other Symptoms, Function in daily living (ADL), Function in Sport and Recreation (Sport/Rec), and knee-related Quality of Life (QOL). It is an extension of the WOMAC Osteoarthritis Index. A Likert scale is used and all items have five possible answer options scored from 0 (No Problems) to 4 (Extreme Problems) and each of the five scores is calculated as the sum of the items included. Scores are transformed to a 0-100 scale, with zero representing extreme knee problems and 100 representing no knee problems as common in orthopaedic assessment scales and generic measures.
Baseline and through study completion, an average of 2 months

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
10-meter walk test
Lasso di tempo: Baseline and through study completion, an average of 2 months
A 10-meter walk test on an overground walkway will assess self-selected walking speed across three conditions: no orthosis, conventional orthosis, and powered orthosis at their preferred assistance level.
Baseline and through study completion, an average of 2 months
Joint range of motion
Lasso di tempo: Baseline and through study completion, an average of 2 months
Joint range of motion for each task will be recorded using optical motion capture and averaged over cycle and repetitions. Motion capture data will be recorded during study visits and used to calculate joint angle, which will then be averaged over gait cycles and activity repetitions to get a range of motion value.
Baseline and through study completion, an average of 2 months
Joint compressive forces
Lasso di tempo: Baseline and through study completion, an average of 2 months
In Aim 3, joint compressive forces for each task will be modeled using OpenSim / inverse dynamics and
Baseline and through study completion, an average of 2 months
Difficulty score
Lasso di tempo: Baseline and through study completion, an average of 2 months

The Knee Injury and Osteoarthritis Outcome Score (KOOS) will be used to assess perceived difficulty for a multi-activity circuit test and isolated activity tests.

The KOOS evaluates both short-term and long-term consequences of knee injury. It holds 42 items in 5 separately scored subscales; Pain, other Symptoms, Function in daily living (ADL), Function in Sport and Recreation (Sport/Rec), and knee-related Quality of Life (QOL). It is an extension of the WOMAC Osteoarthritis Index. A Likert scale is used and all items have five possible answer options scored from 0 (No Problems) to 4 (Extreme Problems) and each of the five scores is calculated as the sum of the items included. Scores are transformed to a 0-100 scale, with zero representing extreme knee problems and 100 representing no knee problems as common in orthopaedic assessment scales and generic measures.
Baseline and through study completion, an average of 2 months
QUEST
Lasso di tempo: Baseline and through study completion, an average of 2 months

We will administer the Quebec User Evaluation of Satisfaction with Assistive Technology (QUEST 2.0) survey after each orthosis condition to assess comfort and satisfaction with the device.

The QUEST 2.0 is a highly-validated, 12-item self-report questionnaire designed to measure how satisfied a person is with a wide range of assistive technology. It contains 12 items divided into 2 primary categories: device subscale and services subscale. Participants rate each item using a 5-point Likert scale: 1 = Not satisfied at all, 2 = Not very satisfied, 3 = More or less satisfied, 4 = Quite satisfied, 5 = Very satisfied. To calculate the final metrics, the scores of the items are summed and divided by the total number of valid responses. This yields three separate scores ranging from 1.0 to 5.0: a Device Score, a Services Score, and a Total QUEST Score. Higher scores indicate a better outcome (greater satisfaction with the technology).
Baseline and through study completion, an average of 2 months

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

University of Michigan

Collaboratori

National Institute for Biomedical Imaging and Bioengineering (NIBIB)

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

18 luglio 2025

Completamento primario (Stimato)

30 marzo 2030

Completamento dello studio (Stimato)

31 marzo 2030

Date di iscrizione allo studio

Primo inviato

16 giugno 2026

Primo inviato che soddisfa i criteri di controllo qualità

22 giugno 2026

Primo Inserito (Effettivo)

29 giugno 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

29 giugno 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

22 giugno 2026

Ultimo verificato

1 giugno 2026

Maggiori informazioni

Termini relativi a questo studio

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • HUM00201957_Period2
  • R01EB031166 (Sovvenzione/contratto NIH degli Stati Uniti)

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

INDECISO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

Sì

prodotto fabbricato ed esportato dagli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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