OA Assist Osteoarthritis Knee Brace


Attention Medicare Patients

Helps reduce OA pain during daily activities.
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Is the OA Assist Brace right for me?

Ideal for those with mild to moderate osteoarthritis to help reduce pain during daily activities. Try our Brace Advisor for personalized product recommendations to meet your needs!

Pain Relief for Active People

DonJoy’s technologically advanced design combines a single upright frame and the 3DF hinge on the OA ASSIST. A patient-ready knee osteoarthritis brace that is ideally suited for activities of daily living.

Features and Benefits

  • Single upright frame with 3 point load that shifts compressive knee joint forces from degenerative area to healthy compartment
  • Telescoping condyle pad (up to 6º of correction) enables patients to adjust load according to activity level
  • 3rd Degree of Freedom (3DF) hinge allows rotation on the calf cuff for an optimal fit (+ / - 11º of rotation from the neutral position)
  • Lightweight and molded EVA foam condyle pad for increased comfort and compliance
  • Lightweight (17 oz.), aircraft grade aluminum frame (0.100” thick)
  • Ergonomic, swooping thigh and calf cuffs provide clearance for the contralateral leg
  • Sili-Grip strap pads and liners promote brace suspension
  • Contoured, flexible cuff shells conform to patient anatomy and help contain tissue
  • Swiveling D-Rings to accommodate leg movement
  • 7 sizes and 1 length (14.5”)
  • Flexion and extension control
  • 1 year warranty on frame and hinges

Medial or Lateral refers to the affected compartment.

What is Osteoarthritis (OA)?

Arthritis refers to more than 100 diseases that affect the joints and their surrounding tissues. Osteoarthritis, or OA, is the most common form of arthritis. The statistics on OA are staggering:

  • Nearly 21 million people in the United States have OA*
  • The incidence of OA is expected to increase even more as the U.S. population ages*
  • Over 7 million Americans are limited in their ability to participate in their main daily activities because of their arthritis*

The joint most often affected by osteoarthritis is the knee. Knee OA is caused by the degeneration or breakdown of articular cartilage that covers the ends of the bones that meet at the joint. Cartilage serves as a cushion between the bones, providing a smooth surface for the bones to move against each other. When the cartilage deteriorates the bones may actually be rubbing together. Your physician will often refer to this as “bone-on-bone” osteoarthritis.

Arthritis Foundation

What is Osteoarthritis (OA) knee bracing and how does it work?

Knee braces are available that are specifically designed to treat OA. They stabilize the joint, help reduce pain and help to build stronger muscles, which allows patients to return to the activities they love. Load redistribution and joint alignment Through a process called “off-loading” or shifting, OA braces help relieve pain by redistributing the weight bearing load on the painful or affected compartment of the joint to the healthy or unaffected compartment. Increased function Studies have shown that wearing an OA brace can increase daily functions and decrease pain.

What to expect from a Osteoarthritis (OA) knee brace

  • Braces cannot cure OA and may not be right for everyone. However, it is a viable solution for many people. The ideal candidates are typically active people who are motivated to strengthen their muscles and willing to wear a brace to realize the benefits of this form of treatment.
  • Discuss treatment goals with your doctor and others on your health care team before you get a brace.
  • Don’t expect a brace to feel good from the start. It may take from a week to a month to get used to how the brace feels on your leg. Be patient. It took a long time for your knee OA to develop.

***NOTE: This item can take up to 2 weeks to ship***

Shop our complete selection of knee braces or browse additional DonJoy products. Shop DonJoy OA Assist replacement parts here.

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Product Questions

I have OA with bone on bone on my right knee medial side. Would this be the brace to order or would the Nano work better. I do a lot of walking but not any heavy exercising. My md said I needed a uploaded.
Question by: Linda on May 14, 2014, 7:15 AM
The OA Assist is for people who are not very active, so if you just do some occasional walking this brace will be fine. The OA Nano is for a very active person. In either of these braces you would need to unload the medial comparment.
Answer by: Admin on May 14, 2014, 7:15 AM
Is this brace a velcro wrap around or a step into brace? I would like to have more explanation on the donning and doffing of your OA braces.
Thank you
Question by: Mary South on Jan 30, 2015, 7:21 AM
The OA Assist is applied by placing the brace on the knee and using the velcro straps around the leg. It is not a step into brace like our other OA braces.
Answer by: Admin on Jan 30, 2015, 7:21 AM
My mom is 80 y.o. 150lbs, has severe chronic OA on both knees and uses a walker, will she benefit from don joy everyday or the OA assist?
I am looking for a brace to help ease her pain and discomfort on getting up from prolonged sitting and lying down, support her on Activities of Daily living while not cumbersome for her .
Question by: Gail on Dec 29, 2014, 8:07 AM
Wear either of those braces on both knee will be cumbersome. If your mother needs to unload the medial compartment then the OA Assist will be a better choice because the hinge will be on the outside of the knee and the two braces will not hit each other. You may want to think about just getting her a standard hinged knee brace to give her basic stability to help her stand up and get around with the walker. The Don Joy Deluxe hinged knee brace will do just that but will not unload her knees.
Answer by: Admin on Dec 29, 2014, 8:07 AM
if you have medial meniscal disease, do you then want a medial support or a lateral one
Question by: ken on Feb 27, 2014, 1:10 PM
For a medial meniscus tear you would want a medial unloader.
Answer by: Admin on Feb 27, 2014, 1:10 PM

Take the measurement of your thigh and calf 6" above and below your kneecap using a flexible type tape measure.  Use the diameter you measure here to choose your size.

    Size Thigh Knee Center Calf
    XS 13" - 15 1/2" 12"-13" 10"-12"
    S 15 1/2" - 18 1/2" 13"-14" 12"-14"
    M 18 1/2"- 21" 14"-15" 14"-16"
    L 21"- 23 1/2" 15"-17" 16"-18"
    XL 23 1/2" - 26 1/2" 17"-19" 18"-20"
    XXL 26 1/2" - 29 1/2" 19"-21" 20"-22"
    XXXL 29 1/2" -32" 21" -23" 22" -24

    Center Knee 1.Stand with your legs shoulder-width apart, legs slightly bent and leg muscles contracted.
    6 in Above 2. Measure up six inches from the center of your knee with a tape measure, as shown.
    Thig Circle 3. Measure the circumference of your thigh at the 6-inch mark, as shown.
    6 in below 4. Measure down six inches from the center of your knee with a tape measure, as shown. Then measure the circumference of your calf at the 6-inch mark.