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Completed

NCT Number: NCT06627361

Comparative Study Evaluating the Mobility of Transtibial Amputee Patients Using the PRO-FLEX PIVOT® Foot Versus a Class III Energy Storing and Returning (ESAR) Prosthetic Foot.

The PRO-FLEX PIVOT® is ESAR prosthetic foot with an innovative technology built around three pillars:

1. The PIVOT technology: three axes of rotation (upper support, main pivot and lower support) at the ankle, which allow both a movement with more amplitude and closer to the physiological movement of the ankle, and an increase in the power of the ankle, especially in the terminal support phase. 2. The technology of the three carbon blades (plantar, upper and median), including a wider plantar blade, split in the middle of the foot with a separate toe to provide efficiency over the entire length to the big toe, bringing more power to the impulse and more control, but also increased stability until the terminal support phase. 3. An anatomical foot cosmetic, to adapt and optimize the function of the blade: of light manufacture, with an adherent sole for more stability barefoot, it guarantees physiological plantar pressure during the unwinding of the foot.

The aim of this study is to demonstrate that compared to a class III ESAR foot, the PRO-FLEX PIVOT® foot improves patient mobility with a validated score.

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Key information

Conditions

Amputation

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Multiples locations

Multiple Locations, France

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Adult patient (over 18 years of age)

  • Unilateral tibial amputee and fitted for at least 6 months with a class III ESAR foot.
  • Regularly using (more than 8 hours/day) a class III ESAR foot
  • Functional class (CNEDiMTS indication)1
  • Insured person.
  • Able to answer questionnaires.
  • Providing informed and written consent to participate in the study.
  • Having a normalized PLUS-M/FC 12 score less than 50 for vascular amputee and 55 for traumatic amputee and other causes of amputation.
  • Experiencing no discomfort related to the socket indicated by a score ≥ 6 on the numerical scale from 0 to 10 (Socket Comfort Score)

Exclusion criteria

  • Bilateral lower limb amputation
  • Femoral amputation
  • Wearing a temporary prosthesis
  • Change of socket or suspension system planned during the study.
  • Change of any functional component as torsion or choc adapter
  • Significant change in the patient's routine activities expected during the study.
  • Progressive associated pathology that may prevent patient follow-up.
  • Associated pathology that may limit the patient's mobility (e.g. disarticulation of the knee, knee pain... )
  • No osteointegration patients
  • Lack of consent
  • Adult subject to enhanced protection, deprived of liberty by judicial or administrative decision, hospitalized without consent or admitted to a health or social institution for purposes other than research.
  • Person not affiliated with or a beneficiary of a health insurance plan.
  • Patient unable to understand the study instructions

Treatment and study plan

PRO-FLEX PIVOT Foot evaluation

Device

The subject will wear the PRO-FLEX PIVOT foot for 4 weeks, following which they will complete questionnaires and undergo a Time Up and Go test

Class III ESAR Foot evaluation

Device

The subject will wear his usual Class III ESAR Foot foot for 4 weeks, following which they will complete questionnaires and undergo a Time Up and Go test

Primary outcomes

  1. Change of mobility of the patient

    Time frame: 28 days

    Assess the foot impact on the patient mobility assessed with Prosthetic Limb Users Survey of Mobility (PLUS-M™) questionnaire. The score ranges from 21.8 (indicated lower mobility) to 71.4 (indicating higher mobility)

Secondary outcomes

  1. Variations in comfort experienced during the wearing of the foot

    Time frame: 28 days

    Evaluate the impact of the foot on the comfort experienced by the patient with visual analog scale (VAS) from 0 (= not at all comfortable) to 5 (=Very comfortable)

  2. Change in quality of life

    Time frame: 28 days

    Evaluate the impact of the foot on the quality of life assessed by the Orthotics Prosthetics Users Survey (OPUS) patient Self report questionnaire. The higher the score [0-92], the better the perception of quality of life.

  3. Change in satisfaction of the patient

    Time frame: 28 days

    Assess the change in patient satisfaction with Quebec User Evaluation of Satisfaction with assistive Technology (QUEST = ESAT in French); Higher scores indicate greater satisfaction.

  4. Occurence of falls

    Time frame: 28 days

  5. Number of patients with technical incidents

    Time frame: 28 days

Sponsors and collaborators

Lead sponsor

Össur Iceland ehf

Industry

Collaborators

  • Clin-Experts

Registry information

Official study title

Prospective, Multicentric, Comparative, Randomized, Cross-over Study Evaluating the Mobility of Transtibial Amputee Patients Using the PRO-FLEX PIVOT® Foot Versus a Class III Energy Storing and Returning (ESAR) Prosthetic Foot

Acronym: DEFI

Important dates

Study start
2023
Primary completion
2025
Study completion
2025
First posted
Oct 4, 2024
Registry last updated
May 22, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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