Official Title

Sustained Acoustic Medicine (SAM) Combined With a Diclofenac Ultrasound Coupling Patch for Knee Osteoarthritis
  • Phase

    Phase 1
  • Study Type

  • Study Participants

The purpose of this study is to measure the effectiveness of Sustained Acoustic Medicine (SAM) treatment combined with diclofenac ultrasound coupling gel in patients with stage II and stage III knee osteoarthritis. The ability of the device to reduce pain, increase mobility, increase function of the affected leg, and improve quality of life in patients with knee osteoarthritis will be evaluated.
This is a seven day study to clinically evaluate the effectiveness of the Sustained Acoustic Medicine (SAM) device combined with diclofenac on symptoms of patients suffering from knee osteoarthritis. The class-II device, sam® has been FDA-cleared for home use. On the first day of the study, baseline data will be collected as patients report pain score before treatment. During the following 6 days, patients will self-apply the wearable SAM device with diclofenac patch to their affected knee for 4 hours daily. Each day of the study, pain scores will be recorded immediately before application of SAM device as well as 30 minutes, 2-hours and 4-hours after applying the device. A quality of life and function assessment will be performed prior to the patient beginning the protocol and at the conclusion of the protocol.

Up to 32 subjects will be recruited from neighboring communities to the study sites. The study is designed to reach a target patient population which includes rural citizens and socioeconomic disadvantaged individuals.
Study Started
Sep 01
Primary Completion
Dec 31
Study Completion
Dec 31
Results Posted
Sep 23
Last Update
Sep 23

Combination Product Sustained Acoustic Device with 1% Diclofenac patch

Patients apply the Sam Ultrasonic Diathermy Device daily for 4 hours of continuous therapeutic ultrasound at 3 megahertz (MHz) frequency and 0.132 Watts/cm2 with 1% diclofenac patch Other Names: ZetrOZ ultrasound device wearable ultrasound device long duration ultrasound LITUS device long duration low intensity device

Experimental: SAM ultrasound and diclofenac patch Experimental

Patients receive treatment from the SAM Ultrasonic Diathermy Device for 4 hours every day for 7 days combined with 1% diclofenac patch. The SAM device emits continuous ultrasound at 3 megahertz (MHz) frequency and 0.132 watts/cm2 intensity.


Inclusion Criteria:

Physician-diagnosed mild to moderate knee osteoarthritis (KL Grade 2-3) based on fixed-flexion x-ray radiological findings for osteophytes and joint space narrowing within the past 12 months
Fulfill the American College of Rheumatology clinical and radiological diagnostic criteria for knee OA
45-85 years of age
Report a frequent pain score between 3-7 (NRS range: 0-10) during the week preceding enrollment
Report that knee pain negatively affects quality of life
Willing not to use any cream, gel, or topical solution during the administration of treatment other than the approved ultrasound 1% diclofenac gel provided to the subject at the initiation of the study
Deemed appropriate by their physician or by the study site physician to participate

Exclusion Criteria:

Cannot successfully demonstrate the ability to put on and take off the device
Display any condition which, in the judgment of the investigator, would make participation in the study unacceptable, including, but not limited to, the subject's ability to understand and follow instructions.
Have severe OA or have little to no cartilage in the knee
Have knee replacement, other surgical intervention, or hyaluronidase injection in the affected knee in the past 6 months
Are non-ambulatory
Participated in a clinical trial for an investigational drug and/or agent within 30 days prior to screening
Modify their medications during the course of the study (medications and doses must remain constant throughout the study)
Currently taking steroids
Have contraindication to radiograph
Have a secondary cause of arthritis (metabolic or inflammatory)


Experimental: SAM Ultrasound and Diclofenac Patch

All Events

Event Type Organ System Event Term

Change in Pain Units on a Scale (0-10) 0 Being Least, 10 Being Worst Pain From Baseline

Change in the self described pain units on a scale by patient at baseline and post-treatment on the range of 0 - 10, 0 being the least pain and 10 being the worst pain.

Experimental: SAM Ultrasound and Diclofenac Patch

pain units on a scale (Mean)
Standard Deviation: 2.41

Change in the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) Scores, Ranging From 0 Being No Difficulty to 2400 Being Extreme Difficulty, From Baseline

WOMAC questionnaire will be utilized (Western Ontario and McMaster Universities Arthritis Index) at baseline and post-treatment to calculate the change in the scores. WOMAC was divided into 3 categories: pain, stiffness, function and total score. The pain category consists of five scores from 0-10, 0 is no pain 10 is worst pain possible for a range of 0 - 50 points. The stiffness category consists of two scores from 0-10, 0 is no stiffness 10 is worst stiffness possible for a range of 0 - 20 points. The function score consists of 17 scores from 0-10, 0 is normal function and 10 is severely limited function, for a range of 0 - 170 points. Categories were multiplied by 10 for analysis. Total score is the sum of pain, stiffness, and function scores (range of 0 - 2400)

Experimental: SAM Ultrasound and Diclofenac Patch

scores on a scale (Mean)
95% Confidence Interval: -508.0 to -195.0

Age, Continuous

YEARS (Mean)
Standard Deviation: 8.8

Numeric Rating Scale (NRS)

Pain Units on a Scale (Mean)
Standard Deviation: 2.39


Units on a Scale (Mean)
Standard Deviation: 528

Age, Categorical

Region of Enrollment

Sex: Female, Male

Overall Study

Experimental: SAM Ultrasound and Diclofenac Patch

Drop/Withdrawal Reasons

Experimental: SAM Ultrasound and Diclofenac Patch