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DonJoy OA Nano

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DonJoy OA Nano Knee Brace

Osteoarthritis Knee Brace is Light as Air

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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.

Features & Benefits

  • Unlimited Comfort - Malleable magnesium frame allows cuff adjustment and delivers patient compliance
  • Light as Air - Material science collides with innovation to create the world's lightest OA knee brace
  • Stays in Place - Contoured design enhances brace suspension for various levels of activity
  • Dependable Off-Loading - New world material "nano MAGTM" (on the loading side) provides strength when offloading
  • Clincally Proven - DonJoy's Adjuster technology off-loads (mechanically shifts weight away from the damaged pare of the knee) a little - or a lot.

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

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

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.


4.75 4

DonJoy OA Nano Knee Brace reviews

I had been using a Lenox Hill ACL stabilizing brace for years but was suffering from ongoing knee pain. I have developed OA in my medial compartment as I got older and my Doc has suggested a knee replacement which I considered a less than desirable choice. So after talking with the very helpful support staff at, the Nano brace was suggested because of its "load spreading" . This brace is light as a feather, comfortable to wear all day long and does such a good job of spreading the load to my healthy lateral compartment that I am basically pain free now. My hope is that with this Nano brace and a good exercise routine should allow me to ward off any knee replacement surgery for years to come... THANKS BETTERBRACES.COM! - Dawn
As an OA sufferer who has had four Arthroscopic Surgeries and was told they needed a knee replacement over ten years ago but that I was to young. I would have to wait until I was Fifty. I am now 46 and am in daily pain but I am very active with backpacking, skiing, cycling, and gym activities, not to mention my professional duties as an Emergency Medical Technician. I cannot afford to be sidelined but I have been experiencing that on an increasing level so much so that I was begging my Dr. for the knee surgery. My MD suggested Cortisone Injections (no help) Synvisc lubricating injections (made me worse). We were right back at square 1. I was then told about OA knee braces and the relief people were getting, so off to the research. I finally got to talk to my MD about it and he was skeptical but told me to go for it. Now after using the Nano for just over two weeks, I am very happy I even walked around Disneyland for 9 hours without anymore pain than I would normally be in. I wear it in the gym, and at work. The popping I was experiencing seems to be a thing of the past and at the end of the day I feel pretty good. - Robert
after just 2 days of wearing this knee brace the doctor ordered me my left knee is now 100% pain free thats going from needing knee replacement surgery 2 weeks ago, this is the 1st brace from this co. and although my last 2 braces were ok they were bigger, heavier, and had a weak spot i had 2 of them that broke in the same place other then that it constantly slipped down to my ankle, this brace does not move an inch i have to say i,m very very happy........the only issue is now that my left knee is pain free i can feel all the pain in my right knee which i never paid attention to because my left knee hurt so bad, i know its early on but thumbs up for this brace i only hope it last me, but hospital did tell me had lifetime guarantee so who knows, thanks for making a brace thats allows me to not feel that horrible pain i have dealt with for years and knee replacement will now be put on the back burner. - Tom
a great brace
I am bone on bone with pain that makes me nauseous it is so strong. I haven't had any pain while wearing this brace. The only negative is that it is a bit bulky for wearing under slacks, so I will probably get the OA Fullforce for that. (I wear my braces all day.) Other than that, it's perfect and amazingly effective for knees riddled with OA. (As with all such braces, remember to use the anti - migration strip on the strap above the calf.) - a great brace

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Questions on DonJoy OA Nano Knee Brace

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  • From Luke kyi win at 5/9/2013 11:55 PM
    • What are the different of OA full force brace?Can this brace push from degenerated cartilage side to healthy side?
    • Hello,

      Yes all of our OA Braces provide off-loading to mechanically shift the painful joint load from the degenerative compartment to the healthy compartment.

      Have a Great Day.
  • From Steve Prysunka at 5/11/2013 7:35 AM
    • I have medial joint space narrowing. On my selection would I choose "medial"?


    • Hello, Steve -

      Yes, you would choose the option "medial" which will open up the medial portion of the joint.

      If you have further questions, please feel free to contact our product specialists at 888-405-3251.

      Thank you and have a wonderful day!
  • From Matt at 6/7/2013 1:59 PM
    • I have had a lateral release and 3 scopes to remove loose cartilage, especially on the back of my knee cap. After the third scope which was 12/2012 my knee hasn't recovered as it has in the past. Pain across the front of the knee, the outside, and the inside of the back of the joint that the doctor tells me it is due to the swelling that occurs when I engage in physical activity. It also hyperextends and gives out on me from time to time, and is showing the beginning signs of OA. Which brace would you recommend for me? Thanks in advance.
    • Hello Matt,

      Do you have medial or lateral OA or Both? Find out from your Physician which meniscus is affected.

      An OA Brace is not recommended for someone who has Bilateral OA. It would cause more pain. Since, an OA brace shifts the weight from the affected side of the knee to the healthy side.

      If you are not a candidate for an OA Brace I recommend a Soft Hinged Brace or a Rigid knee Brace.

      See Below.

      For additional questions please call a Product Specialist at 1-888-405-3251.
  • From WHITIE at 6/13/2013 12:00 PM
    • Using OA NANO How to adjust the 1,2,3,4,5,velcro straps to prevent the hinge from slipping below the knee ?

    • Hello,

      Below you will find links to videos, click on ACL Fitting. This is not your Brace but it's the same application. Each Strap is labeled, in order of application.

      If you have additional question please call a Product Specialist, 1-888-405-3251.

  • From laurel at 6/16/2013 1:28 PM
    • I have the DonJoy OA Nano Knee Brace which my doctor recommended I use after my second knee surgery this May. It does help a lot with my walking. I do want to know if the brace is water proof. I was reading all the information about the brace and it doesn't say if I can get the brace wet.

      Thank you
    • Hello Laurel,

      Yes, you can use the brace in water. We recommend you rinse the brace each time you exit the water.

      Thanks for contacting Donjoy.
  • From Damon at 7/20/2013 5:23 AM
    • I have strange knee shape it would seem. I want to purchase a Donjoy OA Nano, Right Medial. I have had right medial menisectomy, several scopes and a lateral release, I have OA and trying to fight of the inevitable.

      My knee measurements are as follows according to your instructions

      Thigh- 21 3/4
      Knee- 20
      Calf- 20

      What size and am I selecting the right brace.

    • Hello Damon,

      Here is where your measurement fall.


      Looks like you may have some atrophy of your quadriceps muscle. I recommend the XXL, the thigh and calf bar are malleable, you can bend the thigh frame to accomodate the smaller size.

      Have a Great Day.
  • From Shawnee at 10/20/2013 6:30 PM
    • Hello, My dr. is ordering me a DonJoy OA Nano Knee Brace. Can I wear it in the water? I stand up paddleboard A LOT.
    • Shawnee
      Yes you can wear all of our braces in the water, Just make sure to rinse any saltwater from the hinges afterward.
  • From Joe at 12/30/2013 10:13 AM
    • I have a script for a right lateral off-load brace. I often wear a wetsuit for kiteboarding. Can the nano brace be worn over a 2mm wetsuit?
    • Joe,
      Thank you for your question. This brace can be worn over a wetsuit. Make sure to rinse the brace well after each use.
  • From Arthur G Latto at 1/17/2014 11:30 AM
    • I want to order a DonJoy OA nano knee brace but my measurements are a little off on your size chart: thigh 29", knee 17"' calf 16". What do you advise?
    • Hello,

      I recommend you re-measure. Your thigh is an XXL, knee is XL, and calf is a L. This would require a custom knee brace. Re-measure and see if you get the same measurements.

      Thanks for Contacting Donjoy
  • From Arthur latto at 1/18/2014 8:50 AM
    • I requested feedback yesterday but now realize that I made an error in supplying my measurements. Could you please re-evaluate using the following corrected information.

      Wish to purchase Don Joy OA nano Knee brace sizes are a little of with measure ment chart, as follows: thigh 20", Knee 17", calf 16", please advise best option.
    • Arthur
      The meausrements are between a Medium and a Larg. We need to acomidate the knee width so go with the large, you can bend in the frame a little if it is slightly too big, your cal f should be fine but you can do the same for that as well if there is a litte extra room
  • From K Srinivas at 1/29/2014 3:03 AM
    • I have early stages of OA affecting my both knees. I am using Don Joy Medial nano unloaders. My question is it it ok to use the treadmill with these unloaders or is there a danger of further deterioration.
    • Hi,

      The DonJoy OA Nano will still give the support needed for mild activity. This includes light work on the treadmill. Any walking or light jogging is what these braces are designed to help with. If you were looking to do more intense style of training, it would be recommended to move up to a more rigid framed brace like the DonJoy OA Adjuster 3. The more rigid frame can just hold up better to the demands of high intensity activity. (

      Have a good day!
  • From Thamikat at 1/30/2014 12:19 PM
    • I have been diagnosed by my orthopaedic surgeon her in Valencia Spain as suffering from advanced chondropathy in the internal femorotibial compartment of my left knee, with small subchondral lesion. Sublaxation of the internal meniscus, presenting important altertion with small extension to the lower articular surface duto degenerative tear (in both meniscus. Chronic lesion of the collateral medial ligament. Articular hemorhaging, Baker quist. I will be undergiong treatment with plasma rich in growth factors, a treatment pionered by Dr. Mikel Sanchez successfully with athletes, e.g. Rafa Nadal. I am 65 years old and normally have played tennis 4-5 days a week and also ski when the season permits. I want to continue playing tennis. My question is whether tieh OA Nano brace is the most indicated for my condition, to alleviate pain, and permit the best possible rercovery. Thank you for any guidance you might be able to provide. Daniel Soltice
    • The OA Adjuster 3 would be a better choice, if you want to wear it to ski. The Nano is light wieght but not as durable as the OA Adjuster 3. The OA Adjuster 3 wieghs aprrox 20 oz. You would want to order it for the medial compartment. Here is the link
  • From Lizzie at 2/25/2014 2:25 AM
    • Hello from the south of England!
      I am very small (5'1") and have very thin legs. 14, 14 and 10.75. I have only worn my new brace twice, and each time it has slipped down as I walk - a horrid feeling! Can you please give me some advice as to how I can stop it slipping down?
      Yours gratefully,
      PS I have an XS OA Nano DonJoy knee brace
    • Thank you for your question. You may need to attach the anti-migration that came in the bar with the brace. A file will be sent to your person email on how to attach that strap.
  • From Kim at 3/3/2014 5:19 PM
    • Hi- I am curious about the right brace for me. I suffer from OA and have been diagnosed with a media meniscal tear as well as grade 3-4 chondrosis in the medial joint compartment. I am on my feet all day as a teacher and am looking for support in every day activities as well as moderate exercise and backpacking. Wondering which would be best, the nano, the OA Adjuster or e everyday. Thanks for your suggestions!
    • Thank you for your question. The OA Nano is a brace more commonly used for everyday activities as well as the OA Everyday. A more appropriate brace for you would be the OA Adjuster. This brace is recommended for active people with moderate to severe OA. Please let us know if you have any further questions.
  • From Kim at 3/4/2014 8:34 AM
    • Thanks for responding to my first question - to follow up... You recommended the OA Adjuster - which one them... the OAAdjuster 3 for 679.00 or the OAAdjuster Osteoarthritis brace for 649??
      Thanks for clarifying!
    • Thank you again for your question. The OA Adjuster and the OA Adjuster 3 are going to be very similar. The Adjuster 3 will be slightly lighter. The upright with the adjustable hinge on the OA Adjuster 3 will be made of magnesium as opposed to Aircraft Grade Aluminum. Both are going to be recommended for active life styles and moderate to severe OA. The Adjuster will be more rigid and slightly heavier, it would be suggested for larger people, or people who may be in activities that involve outside contact (example: construction workers). Please let us know if you have any further questions.
  • From Michael Valentine at 4/25/2014 8:09 AM
    • My right knee was diagnosed with Stage 4 Arthritis with OA in the medial are. I'm currently using the OA Everyday brace and was looking for something with a little more support when I'm more active, but still in the same size weight as the Everyday. I also took my measurements which fall into several categories, Thigh-22", Knee-17", Calf-15". Which OA brace would offer some more support, still fit under most clothing and what size would you recommend?
    • Thank you for your question. The OA Adjuster would be a good brace for an active person. It is a bit lighter than the OA everyday and very comfortable. A large would be an appropriate size for you.
  • From Dorothy at 8/7/2014 6:26 AM
    • What is the best way to clean the straps and liners of the OA Nano brace -- can they be put in a washing machine?
    • Hand washing is the best and air dry. I would suggest washing the entire brace instead of taking the pads and straps off so you don't have to figure out how to put everything back together
  • From Hesham at 8/29/2014 11:12 AM
    • Will Nano brace set off the metal detector at airport security?
    • It has a magnesium frame but there is some metal in the hinges so it might set it off
  • From Doug Nguyen at 10/10/2014 11:37 AM
    • My left knee:
      a) Mild grade 4 patellofemoral chondromalacia
      b) Minimal medial miniscus degeneration, no visible meniscus tear
      Right knee:
      a) Grade 3 patellofemoral chondromalacia
      b) Proximal medial collateral ligament carring and mild degeneration
      c) elangated flat mediat popliteal cyst
      d) small joint effusion

      question: 1) can I play tennis freely with these braces? if so what type?
      2) will I still feel some pain while playing?
      3) will this restrict any moving, turning while playing tennis?

    • Doug
      Wit Chrondromalacia in both of your knees the Reaction Web Knee Brace may be the best knee brace to help reduce pain associated with the chodromalacia. The Reaction absorbs force and dispearses it into the webing of the brace to reduce anterior knee pain. The Braces are low profile so can be worn while exercising
  • From Jonathan at 10/24/2014 8:48 PM
    • I have a small articular cartilage defect/tear near the lateral femoral condyle. Is this brace suitable?
    • Jonathan
      Yes the OA Nano would be a brace that you can use to unload that lateral side of your knee. Make sure you choose lateral compartment when ordering
  • From Monique at 11/12/2014 7:55 AM
    • I am trying to figure out which OA brace would be right for me. I have been looking at the OA Nano and the OA Adjuster. I have been diagnosed with mild degenerative changes of the medial meniscus (right knee) and I also have a mild case of genu valgum (knock knees). I'm looking for something that I can wear everyday. I do go to the gym a couple of times a week, but work a sedentary job. I am also trying to figure out what size would be best (knee center- 14.5, thigh - 18, calf - 15/ I'm a 5'5" female). Also, I want to verify that i would gat a brace for right medial. Any information would be greatly appreciated.
    • Monique
      You need to decide what you are going to get the brace for. Do you want to get something to unload the medial meniscus? Then a medial unloader is what you want. If you want something to help the genu valgum, then you would get the lateral unloader, but that would push on the medial sid eo of your knee. The OA Nano is for mild OA so that would be a better choice than the Adjuster. You would want to wear the medium size
  • From Marina at 11/25/2014 5:35 PM
    • I just got my OA Nano 4Titude OA Nano OA adjuster and i got it n during my pt but after i got home and tool it off to shower and now I have an extra strap that is not numbered .my question is where does it go it was on before i had no extra straps in the bag please help
    • Marina
      Take your brace back to the Pt and have them put the strap back on. The can call product Support if they need help 1-888-405-3251
  • From Bruce Russell at 11/29/2014 3:14 PM
    • I have a nano brace and the metal on the top inside has broken, literally broken in half causing it to lose its off loading benefit. What are my options?
    • Bruce
      Tha brace has a 1 yr warranty on the frame and hinges. You can take it back to where you received it if it is under warranty and get a new brace
  • From Illini-Chris at 1/1/2015 10:47 AM
    • I am (had been) a marathoner and long distance triathlete. I suffered a torn medial meniscus in right knee and previously had experienced some off-and-on mild knee discomfort. I had knee surgery to trim both the medial and lateral menisci. Unfortunately, the surgeon also felt the need to clean out the arthritis in the knee. There was one very small area of bone-on-bone (~10 mm.) Now the load transfer thru my knee is completely different, and I constantly experience discomfort and stiffness at the front of the knee, even in the absence of physical activity.

      I have a leg length difference with the right leg being about 1/2" shorter, which likely led to the more extensive damage in the right knee over the years. A recent MRI showed the following in the Bone Structures: "The patient has mild medial knee compartment joint space flattening. There is also mild flattening laterally. Marrow edema is present in the posteromedial aspect of the lateral tibia plateau I do not see a fracture line. There is also subtle marrow edema in the medial femoral Cordele as part of the medial knee compartment. There is moderate cartilage loss on both sides of the medial knee compartment less pronounced laterally."

      I do not plan to run any more marathons, but I want to be able to walk vigorously and maybe run a few miles on hard-pack, even surfaces a few times a week (or use elliptical or tread-mill.) I also want to be able to ride my bike long distances. What do you suggest to partially redistribute load thru brace to relieve pressure on knee, reducing the pain in front and preventing further damage? Damage is bilateral so I do not want to redistribute load laterally.

      Please be specific in your brace recommendations because there are a lot of options. Thanks.
    • It sounded like most of the damage is on the medial side of your knee so i would reccommend a medial unloading brace, most likley the OA nano or the OA Full Force Knee Brace. The Nano is lighter 14 oz compared to the Full Force with is 20 oz. They are both for moderate OA. But if you do not want to distribute the weight laterally the only other option is a hinged knee brace such as the Deluxe Hinged Knee Brace. This brace does not unload either compartment but will give general knee support.
  • From MRI gal at 1/15/2015 12:57 AM
    • I am a MRI Technologist. Can the uploading brace be worn while working in the MRI suite? I need to find out if all of the materials are MRI safe. This in reference to working in MRI, not having a MRI.

    • There is metal in the brace so you will have to go by your protocols for that specific MRI machine that you have in place at your facility
  • From wyyuan at 2/10/2015 5:17 PM
    • I used to be a very active sport player playing soccer, tennis etc and 8 month ago fell in love with badminton, then my OA knee is getting worse. May this brace help if I wear it while playing badminton?
    • Wyyuan
      Yes the OA Nano is for very activie people and can be used duting actvities. The brace will unload either the medial or lateral side of your knee while wearing it.
  • From Annie O'Shea at 2/21/2015 2:11 PM
    • I bought a DonJoy OA Reaction Web Knee and it has served me well, except that the velcro wore out and you replaced it. My condition has worsened dramatically and the brace isn't effective anymore as far as pain control...still feels supportive, though. I was never sure if the offloader idea really worked. A rep came by to make sure I was wearing it properly. How do you know if offloading is working? Less pain?
      Anyway, I can't get a knee replacement for several months and I was wondering if a stronger brace might help until then. My main activities where I used the brace were low impact aerobic dance and brisk 3-5 mile walking. I have had to stop since even with the brace I have terrible pain afterwards.
      THX Annie
    • Annie
      The OA Reaction Web knee Brace is for someone with mild OA, so if you need a knee replacement then your knee is most likely more severe than mild. The offloading should help decrease the pain in that compartment. We do have other braces that will offer more off loading. The OA Nano is for mild to moderate OA and the OA Adjuster 3 is for severe OA. The Nanao is a lighter brace, only 14 oz and the Adjuster 3 is 23 oz.
  • From Greg at 2/28/2015 5:58 AM
    • How long should the OA Nano Brace Last? I have worn My Brace Daily for a little 13 Months, and the Metal Frame has Broken. The Frame that Cover the upper Thigh has Fatigue Cracked and it totally separated. Would l=this be covered under Warranty? I like the Brace, and it really helps to reduce the swelling and Inflammation.
    • Greg
      Although the OA Nano has a one year warranty on the frame and hinges the frame should not have broken after such a short period of time. Please call me at product support 888-405-3251 so I can arrange a replacement. And get your brace sent in to us.
  • From Michelle at 3/23/2015 6:30 AM
    • I need a right lateral knee replacement but due to polio they don't want to go ahead with that. My knee angles medially so I thought it would be best to have the nano knee brace with the pressure coming from the medial side to stop the bones rubbing on the lateral side. Do I order a medial or lateral??? My physio also agreed with me but we are not sure which one I should order to accomplish this. Thanks
    • Michelle
      OUr OA braces push the knee towards the opposite side to unload that same opposite side. You were correct you will want to go with the lateral brace and you will adjust from the medial side to push the knee towards the outside.

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