Basic Mobility and Balance Performance of Low Active Transfemoral Prosthesis Users With a Powered Prosthetic Knee

NCT ID: NCT04799145

Last Updated: 2026-01-21

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 6 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-02-05
• Study Completion Date: 2021-02-24

Brief Summary

This was a prospective case series design investigation with 6 prosthesis user subjects. Subjects performed the Timed up and go (TUG) test and the two minute walk test (2MWT) along with some activities of daily living (ADL), on their prescribed knee as well as the investigational device at two separate visits. Performance was compared and statistically analyzed.

Detailed Description

Participants were consented, and all tests were conducted at the Össur Motion lab Grjótháls 1-5, 110 Reykjavik.

There were two scheduled study events. At the initial visit, the first study event, for each subject a researcher qualified to obtain informed consent seated the subject and proceeded as described in chapter 13.7 Informed consent in [2].

Prior to fitting the subject was asked to provide feedback on their prescribed prosthesis, by filling in a questionnaire and perform AMPro, LCI (modified), TUG test, 2MWT and other validation activities (stand to sit, sit to stand, level ground, stair and ramp walking), as applicable. The users were fitted within the standard methods of prosthetic fitting, alignment, introduction, training and walking on various terrain.

After initial fitting subjects carried out validation tasks (stand to sit, sit to stand tasks, level ground walking at different speeds, stair and ramp walking), stroop test (cognitive loading) and FSST on the investigational device, after which they answered an in-house questionnaire to provide feedback.

During the second event, subjects were fitted with the investigational device and asked to perform the TUG, 2MWT and any validation tasks that could not be completed at visit 1 on the investigational device due to time restraints or subject condition.

If for some reason all tasks could not be completed at visit 1 and 2 due to time restraints or subject condition, a third visit was added.

Subjects did not wear the device home between visits.

Statistical Considerations:

Outcomes were inspected for normality. If the data was deemed to have a normal distribution the hypothesis was tested using a two-tailed, paired t-test (Only hypothesis A and B). If data was deemed non-normal that hypothesis was tested using a Wilcoxon signed rank test. Significance level (alpha) will be set at 0.05.

Other endpoints and acceptance criteria were assessed with descriptive statistics only.

Conditions

Prosthesis User; Amputation

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Investigational device

All subjects performed outcome measures on their prescribed knee and the investigational device for comparison.

Group Type: EXPERIMENTAL

Investigational device

Intervention Type: DEVICE

Motorized microprocessor controlled prosthetic knee.

Prescribed device

Intervention Type: DEVICE

Passive microprocessor controlled knee and mechanical knee

Interventions

Investigational device

Motorized microprocessor controlled prosthetic knee.

Intervention Type: DEVICE

Prescribed device

Passive microprocessor controlled knee and mechanical knee

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

• 50Kg< body weight < 116Kg
• Cognitive ability to understand all instructions and questionnaires in the study;
• K1-K2 unilateral transfemoral amputees
• Allows for 37mm knee center height to dome of pyramid alignment
• Age ≥ 18 years
• Willing and able to participate in the study and follow the protocol
• Comfortable and stable socket fit (5 or over on the SFCS)

Exclusion Criteria

• Users with cognitive impairment
• Users aged <18y
• Bilateral amputees
• Users with stump pain affecting their functional mobility
• Users with socket problems
• Users with co-morbidities in the contra-lateral limb, which significantly affect their functional mobility

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Össur Iceland ehf

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

CII2020111613

Identifier Type: -

Identifier Source: org_study_id