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DONJOY Arthritis Knee Brace - OA Nano

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Light as Air

Material science collides with innovation to create high-tech functional comfort in a lightweight design. The flexibility of the magnesium frame allows for an intimate fit while the revolutionary nano MAG material provides strength to off-load and provide pain relief. OA Nano, for mild to moderate knee osteoarthritis (OA), is designed for people to stay active and move freely, making patient compliance a reality.

Revolutionary in weight and profile, OA Nano™ offers industry-leading high-tech comfort and pain relief, ensuring that patients will choose this safe, non-invasive treatment over other options. Patients with knee osteoarthritis today have the opportunity to treat their pain and stabilize their knees with non-invasive, non-addictive treatment options. With the launch of OA Nano™, the world’s lightest* knee brace at 14.2 ounces, OA patients can take advantage of the same technology used by the world class athletes DonJoy is known for treating.

OA Nano is intended for mild to moderate osteoarthritis.

90 Day Test Drive

Braces that don’t fit properly can be uncomfortable to wear, slip out of place, or produce excessive pressure that can lead to skin problems and soreness. In many cases, the brace simply doesn’t provide pain relief. DonJoy’s custom and patient-ready OA braces accommodate most people and come with our no-risk Test Drive offer. Satisfaction guaranteed.


The Arthritis Foundation has honored DonJoy knee osteoarthritis braces with its coveted “Ease-of-Use” Commendation after an independent research lab conducted rigorous testing to assure that they met the needs of people with functional limitations due to the effects of arthritis.


At just 14.2 ounces this brace won't slow you down as you go about your daily activities.
DonJoy's Adjuster technology off-loads (mechanically shifts weight away from the damaged pare of the knee) a little - or a lot.
The malleable magnesium frame allows you to adjust the cuffs according to your preference.
Contoured design enhances brace suspension for various levels of activity

Signs & Symptoms

Osteoarthritis can remain undetected until a significant portion of joint cartilage has worn away. Signs to look for include, but are not limited to:

  • Joint pain, tenderness, stiffness and locking
  • Joint swelling (bones around the joints may feel larger than normal)
  • Ligaments and muscles around a joint become weaker and stiffer
  • A cracking or grating sound when a joint is moved
  • Limited range of joint motion


  • Natural aging and wear and tear
  • Bleeding disorders that cause bleeding in the joint, such as hemophilia
  • Disorders that block the blood supply near a joint and lead to avascular necrosis
  • Other types of arthritis, such as chronic gout, pseudogout or rheumatoid arthritis
  • OA can develop within 10 years of a major joint injury. For example, a teenager who tears their ACL at age 15 could begin to develop OA as early as age 25 or 30

Risk Factors

Certain factors that increase the risk of developing OA include, but are not limited to:

  • Heredity
  • Being overweight
  • Joint injury
  • Repeated overuse of certain joints
  • Lack of physical activity
  • Nerve injury
  • Aging

Potential Complications

Other complications may arise from osteoarthritis. They include, but are not limited to:

  • Pain that causes stiffness and loss of movement ability
  • Muscle spasms and contractions in affected tendons
  • Fluid accumulation in the joint
  • Crackling noises in the joint
  • Hard bony enlargements, nodes, or bunions form around the joint

Sizing Chart:

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.

    SizeThighKnee CenterCalf
    XS13" - 15 1/2"12"-13"10"-12"
    S15 1/2" - 18 1/2"13"-14"12"-14"
    M18 1/2"- 21"14"-15"14"-16"
    L21"- 23 1/2"15"-17"16"-18"
    XL23 1/2" - 26 1/2"17"-19"18"-20"
    XXL26 1/2" - 29 1/2"19"-21"20"-22"
    XXXL29 1/2" -32"21" -23"22" -24
    Center Knee1.Stand with your legs shoulder-width apart, legs slightly bent and leg muscles contracted.
    6 in Above2. Measure up six inches from the center of your knee with a tape measure, as shown.
    Thig Circle3. Measure the circumference of your thigh at the 6-inch mark, as shown.
    6 in below4. 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.

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

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