Effectiveness and Safety of the Electrically Powered Orthopedic Exercise Device on Gait Ability in Patients With Who Have Undergone Hip Surgery

August 21, 2025 updated by: Yonsei University

Study to Verify the Effectiveness and Safety of the Electrically Powered Orthopedic Exercise Device on Gait Ability in Patients Who Have Undergone Hip Surgery: Investigator-Initiated, Single-Center, Single-Group Clinical Trial

Gait is an essential daily activity performed through the complex coordination of the central and peripheral nervous systems and the musculoskeletal system. Gait disorders can negatively affect quality of life, increase the risk of falls, decrease the ability to perform daily activities, and limit physical activity. Gait disorders can result from various musculoskeletal conditions, with hip osteoarthritis, avascular necrosis of the femoral head, and hip fractures being the most representative causes.

In the early stages of hip osteoarthritis, avascular necrosis of the femoral head, or non-severely displaced hip fractures, various intervention therapies, including rehabilitation exercise therapy and injection treatments, can be attempted. However, these intervention therapies only alleviate symptoms and cannot prevent disease progression. Consequently, most patients eventually experience thinning of the full-thickness hip cartilage, collapse of the femoral head, nonunion, or worsening displacement, which leads to restricted hip range of motion. As a result, lower limb muscle weakness and functional decline occur, ultimately requiring hip surgeries such as total hip arthroplasty or open reduction and internal fixation. Although most patients experience a recovery in gait ability after hip surgery, some show a slower recovery rate or fail to achieve normal walking.

It has been reported that over 80% of function is recovered by three months after surgery; however, during this period, patients experience limitations in performing daily activities. As a compensatory mechanism, excessive weight-bearing on the non-operated limb may occur, increasing the risk of overloading the non-operated hip. This may lead to the development of osteoarthritis in the non-operated limb and has also been reported to increase the risk of falls. Therefore, various methods are being studied to facilitate gait function recovery after hip surgery and promote an early return to daily activities.

Therefore, this study aims to explore the clinical feasibility of the Angel Suit H10 (Angelrobotics, Seoul, Korea) by assessing whether wearing the Electrically Powered Orthopedic Exercise Device improves gait function in patients who have undergone hip surgery, along with evaluating user satisfaction and device safety.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

(1) Overview of study design This investigator-initiated exploratory study is a pilot study designed to evaluate the effectiveness and safety of the Electrically Powered Orthopedic Exercise Device by measuring and analyzing gait function and balance ability in patients who have undergone hip surgery under both non-wearing and wearing conditions.

(2) Experimental Group and Evaluation Procedures

  1. Participant Selection:

    This study includes a single test group with a total of 30 participants. The selection of participants for the electrically powered orthopedic exercise device and the overall study process will be conducted under the prescription and guidance of a rehabilitation medicine specialist, and supervised by assistants (physicians and occupational therapists). The examiner will collect clinical information and conduct a screening assessment for each participant.

  2. Evaluation Phase Without Device:

    After the screening test, participants undergo assessments of walking ability and balance without wearing the motorized orthopedic exercise device. A 10-minute rest period is provided between each assessment. If the participant wishes, additional rest time is allowed and recorded in the case report form. The assessments include the 10-Meter Walk Test, the 6-Minute Walk Test, the Timed Up and Go Test, and the Berg Balance Scale. These evaluations are conducted in the rehabilitation function testing room on the second floor of the facility under the supervision of the research team (physician and either a physical or occupational therapist).

  3. Pre-Adaptation Phase:

    After the evaluations without the device, a total of four adaptation sessions are conducted, during which the participant wears the device and performs short-distance walking within 10 meters. These sessions are designed to help the participant become familiar with the operation and wearing method of the H10 device. Appropriate device settings are configured for each participant to minimize any potential inexperience or anxiety during use. Participants must complete all four adaptation sessions, and each session should be conducted within a two-week interval.

  4. Evaluation Phase:

After completing all four adaptation sessions, participants undergo assessments of walking ability and balance while wearing the motorized orthopedic exercise device. A 10-minute rest period is provided between each assessment. If the participant wishes, additional rest time is allowed and recorded in the case report form. The assessments include the 10-Meter Walk Test, the 6-Minute Walk Test, the Timed Up and Go Test, and the Berg Balance Scale. These evaluations are conducted in the rehabilitation function testing room on the second floor of the facility under the supervision of the research team (physician and either a physical or occupational therapist). After the evaluations are completed, a usability and satisfaction survey regarding the motorized orthopedic exercise device is conducted.

Study Type

Interventional

Enrollment (Estimated)

30

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

  • Name: Na Young Kim, MD, PhD
  • Phone Number: +82 010 9127 4482
  • Email: kny8452@yuhs.ac

Study Contact Backup

  • Name: Hwi Woo Yang
  • Phone Number: +82 010 7360 4439
  • Email: Rehab5@yuhs.ac

Study Locations

  • South Korea
    • Gyeonggi-do, South Korea
      • Yongin-si, Gyeonggi-do, South Korea, South Korea, 16995
        • Recruiting
        • Yongin Severance Hospital
        • Contact:
        • Principal Investigator:
          • Na Young Kim, MD, PhD
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Individuals aged 19 or older
  2. Individuals who have undergone hip surgery due to hip osteoarthritis, avascular necrosis of the femoral head, or hip fracture
  3. Individuals who are at least two days post-hip surgery and are assessed to be medically stable
  4. Individuals who have adequate cognitive ability (Korean Mini-Mental State Examination score ≥ 20)
  5. Individuals able to sit at the edge of a bed without assistance and stand for 10 seconds regardless of support
  6. Individuals who are Functional Ambulatory Category (FAC) score of 1-3
  7. Individuals who visited Yongin Severance Hospital, understood the study, and signed informed consent

Exclusion Criteria:

  1. Individuals who, after undergoing hip surgery, present with exudate at the surgical site or report symptoms such as heat, redness, swelling, or severe pain at the affected area
  2. Individuals who have contraindications for lower limb weight-bearing such as severe joint contractures, osteoporosis, or untreated fractures
  3. Individuals who have progressive or unstable brain diseases or neurological paralysis from stroke
  4. Individuals who have active infections or open wounds hindering device use
  5. Individuals who have significant leg length discrepancies
  6. Individuals who have severe deformities or contractures in the lower extremities
  7. Individuals who have history of poliomyelitis
  8. Individuals inable to maintain seated or standing positions independently
  9. Individuals who have severe spasticity (Modified Ashworth Scale grade ≥ 2)
  10. Individuals who have bone metastases from cancer
  11. Individuals who have severe internal diseases affecting device use (e.g., cardiovascular or respiratory diseases)
  12. Individuals who have cognitive impairments preventing cooperation with device use
  13. Individuals who have complaints of device-related side effects or potential rehabilitation discontinuation (e.g., severe obesity, skeletal deformity)
  14. Patients who are determined to be pregnant or potentially pregnant based on the medical interview
  15. Individuals who have any other clinically significant findings deemed inappropriate by the investigator

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Wearing conditions of Electrically Powered Orthopedic Exercise Device
Participants will undergo gait and balance function tests under both non-wearing and wearing conditions of the electrically powered orthopedic exercise device
Device: Electrically Powered Orthopedic Exercise Device
Participants who pass the screening undergo an evaluation of gait function and balance ability without wearing the Electrically Powered Orthopedic Exercise Device. Afterward, the patient wears the motorized orthopedic exercise device for a total of four adaptation sessions. In each session, the patient performs short-distance walking within 10 meters while wearing the device to explore the appropriate assistive mode and level of support that match their physical condition. No evaluations are conducted while wearing the device during sessions 1, 2, and 3. After the 4th session, an evaluation identical to the one conducted without the device is performed while wearing it, and a satisfaction survey is conducted.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
10-Meter Walk Test
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Patients are instructed to walk 14 m, including 2 m at both ends for acceleration and deceleration, at their comfortable speed. Gait speed was calculated by dividing the 10m distance by the time taken.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Timed Up and Go (TUG) Test
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Researchers ask patients to rise from a seated position, walk a distance of 3 m, turn around, return to the chair, and sit back. The average time of three trials was recorded as a result
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
6-Minute Walk Test
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Patients are instructed to walk back and forth along the 30-meter path as many times as possible within 6 minutes. The examiner records the total distance covered, abnormal gait patterns, and the time of occurrence of any gait deviations.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Berg balance scale (BBS)
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Patients are asked to perform 14 tasks regarding the static and dynamic balance of patients. Each task was rated on a five-point scale from 0 to 4, with a total score of 56.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Spatiotemporal Parameters of Gait : Total Step Count
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

While the participant performs the test wearing an insole-type gait analyzer, spatiotemporal gait parameters are collected and recorded.

Total Step Count: The total number of steps taken during walking.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Spatiotemporal Parameters of Gait : Cadence
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

While the participant performs the test wearing an insole-type gait analyzer, spatiotemporal gait parameters are collected and recorded.

Cadence: The number of steps taken per minute, measured in steps per minute (spm).
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Spatiotemporal Parameters of Gait : Self-Selected Walking Speed
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

While the participant performs the test wearing an insole-type gait analyzer, spatiotemporal gait parameters are collected and recorded.

Self-Selected Walking Speed: The participant's walking speed when walking naturally at a comfortable pace.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Spatiotemporal Parameters of Gait : Distance
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

While the participant performs the test wearing an insole-type gait analyzer, spatiotemporal gait parameters are collected and recorded.

Distance: The total distance covered during walking, measured in meters (m).
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Spatiotemporal Parameters of Gait : Stride Length
Time Frame: A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4

While the participant performs the test wearing an insole-type gait analyzer, spatiotemporal gait parameters are collected and recorded.

Stride Length: The distance between the heel of one foot to the heel of the same foot during consecutive steps. Measured in meters (m), stride length is adjusted for height to account for differences in body size.
A baseline assessment without wearing the device will be conducted on the same day as session 1, and an end-point assessment while wearing the device will be conducted on the same day as session 4
Satisfaction evaluation
Time Frame: Upon completion of the end-point assessment conducted on the same day as session 4
Participants will complete a satisfaction survey for usability and satisfaction assessment of the electrically powered orthopedic exercise device, based on the Korean version of the Quebec User Evaluation of Satisfaction with assistive Technology (K-QUEST 2.0).21 This survey consists of 12 items on a 5-point scale. Participants rate their satisfaction with the assistive device and related services
Upon completion of the end-point assessment conducted on the same day as session 4

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Yonsei University

Investigators

  • Principal Investigator: Na Young Kim, MD, PhD, Severance Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

April 7, 2025

Primary Completion (Estimated)

April 6, 2026

Study Completion (Estimated)

April 6, 2026

Study Registration Dates

First Submitted

April 21, 2025

First Submitted That Met QC Criteria

August 21, 2025

First Posted (Estimated)

August 29, 2025

Study Record Updates

Last Update Posted (Estimated)

August 29, 2025

Last Update Submitted That Met QC Criteria

August 21, 2025

Last Verified

August 1, 2025

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 9-2025-0017

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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