Using Pressure Detecting Insoles to Reduce Knee Loading

Study Purpose

The purpose of this study is to determine whether use of a pressure-detecting shoe improve can enhance favorable loading conditions at the knee.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 40 Years and Over
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

  • - Able and willing to give informed consent and comply with the study protocol.
  • - Symptomatic OA of the knee greater than 3 months, as defined by the American College of Rheumatology's Clinical Criteria for Classification and Reporting of OA of the Knee.
If symptoms are bilateral, then the knee identified as more symptomatic will serve as the index knee.
  • - Ambulatory knee pain, defined as the presence of greater than 30 mm of pain while walking on a flat surface (corresponding to question 1 of the visual analog format of the WOMAC).
  • - Radiographic OA of the study knee of grade 2 or 3, as defined by the modified Kellgren and Lawrence (K-L) grading scale.
  • - Medial compartment OA, defined as either qualitative joint space narrowing of ≥ 1or the presence of medial bone cyst, sclerosis, or osteophyte.
  • - Able to walk at least 10 minutes without a break.
  • - Age of 40 years or older

    Exclusion Criteria:

    - Unwillingness to wear study shoes for at least 6 hours/day for 6 days of the week - Knee flexion contracture of > 15 degrees or inability to ambulate without assistance.
  • - Presence of clinical OA of the ankle or hip or ankle/hip pain>10 mm (WOMAC).
  • - Predominant lateral compartment OA, defined as narrowing of the lateral joint space in excess of the narrowing of the medial joint space in either knee.
  • - Concurrent systemic inflammatory arthropathy - Prior knee or hip arthroplasty, or surgical arthroscopy within the previous 3 months.
  • - Intrinsic foot disease: hallux rigidus, hallux abducto-valgus, metatarsalgia, plantar fasciitis, peripheral neuropathy, or any foot condition that may be exacerbated particular footwear.
  • - Intra-articular knee injection: steroids within 6 wks, hyaluronan derivatives within 4 mos.
  • - Body mass index greater than 38.

Trial Details

Trial ID:

This trial id was obtained from, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Rush University Medical Center
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Markus Wimmer, PhD
Principal Investigator Affiliation Rush University Medical Center
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Recruiting
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Knee Osteoarthritis
Additional Details

This is a randomized longitudinal proof-of-concept study. After a telephone prescreening, an in-person visit will screen for inclusion and exclusion criteria, requiring a clinical and radiographic assessment. A total of 40 subjects with symptomatic and radiographic medial knee OA will be enrolled in the study after obtaining informed consent. A total of three study visits will occur at the following time points: baseline, 3 weeks, and 6 weeks. At all three visits, the following outcome variables will be acquired:

  • (1) joint loads during gait using 3D motion analysis and (2) knee symptoms, stiffness, pain, daily function, recreational function, and quality of life using the validated questionnaires.
At the baseline visit, every participant will receive a standardized shoe and a pressure-detecting shoe insole. Randomly assigned to one of two groups, participants assigned to group A (n=25) will train for 3 weeks in the mobility shoe with active pressure-based feedback from the shoe insole, and group B (n=15) will train for three weeks in the mobility shoe with a passive shoe insole. All subjects will be encouraged to wear the study shoes containing the shoe insoles as their primary form of footwear and for a minimum of 6 hours/day, 6 days/week. They will be given a diary to record the daily time spent wearing the shoe/insole, daily analgesic history, and adverse events. These diaries will be reviewed at the 3 and 6 week study visits. After completing the third visit, subjects will have completed the study.

Arms & Interventions


Experimental: Flexible shoe with Active Insole

Subjects will be trained to change the plantar pressure using a flexible walking shoe with an activated pressure-detecting shoe insole (Moticon OpenGO insole).

Active Comparator: Flexible shoe with Passive Insole

A flexible walking shoe with a passive pressure-detecting shoe insole will be used for a comparator group.


Device: - Active Moticon OpenGO insole

A Moticon OpenGO insole measures shoe pressure and connects/sends data to a ANT+ enabled smartphone.

Device: - Passive shoe insole

A deactivated insole measures shoe pressure only.

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Rush University Medical Center, Chicago, Illinois




Rush University Medical Center

Chicago, Illinois, 60612

Site Contact

Markus A Wimmer, PhD

[email protected]