DonJoy Defiance III Custom Knee Brace

Recognized as the best ligament knee brace available. Top-of-line protection that is custom fit for your leg. Ideal for athletes who participate in contact sports and want to prevent a knee ligament injury or re-injury.

This item requires custom fitting and is only available through your doctor with a prescription.

Alternative Product Solutions


The Defiance III is one of our strongest knee braces by DonJoy and is recommended for athletes participating in high-collision sports, like football, motocross, or skiing. The DonJoy Defiance III Knee Brace is one of our top custom knee braces. This brace is also ideal for athletes who participate in water sports like surfing, wakeboarding, or kite surfing. People recovering from ACL and other knee ligament surgeries also use this brace on a regular basis. If you are involved in non-contact sports, require a lightweight brace to maximize speed, or want a custom brace for everyday wear we recommend the DonJoy A22 custom knee brace.

Features & Benefits

  • Manufactured to your exact measurements to ensure support, protection and comfort during movement.
  • Available in 3 lengths: standard, short, and a short calf version for ski boot clearance
  • Four-Points of Leverage System helps reduce strain on the ACL
  • Lowpro Fourcepoint Hinge Technology helps reduce the amount of time the knee is in an "at-risk position"
  • Carbon Fiber Frame delivers lightweight and strong brace
  • Anti-Migration Supra Condyle Pad helps keep the brace in place
  • Swiveling Strap Tabs enables the brace to move with you
  • Select from different designs and colors during your fitting appointment
  • Designed to support and protect ACL / PCL instabilities, combined instabilities, MCL / LCL instabilities, post ACL / PCL reconstructions, and hyperextension
  • Recommended for football, motocross, skiing, surfing, wakeboarding

Size Chart & Fit Guide

When you order a DonJoy Defiance III knee brace, it will be custom fitted by one of the DonJoy bracing experts in your local area. Upon placing your order, your local expert will contact you to schedule the appointment to take your custom measurements. Please allow up to 5 business days to be contacted. Your brace will be delivered within a week from the date your measurements are taken.

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DonJoy Defiance III Custom Knee Brace

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    Customer Reviews 13 item(s)

    Got back to being a catcher really quick!!

    Reviewed by:
    This is an amazing brace and has helped me tremendously to get back to doing the thinks i loveeeee I definitelyyyyy recommend it. I have had mine for about a year and a half now I use at least 3-7 times a week and it has held up really well. And I play softball so I'm very rough with it
    Pros: Very durable and very comfortable
    Cons: Gets squeaky after a while and the straps are not sticking anymore and I don’t know where to buy any to replace them
    Posted on January 18, 2020

    Defiance III

    Reviewed by:
    If your looking for the best brace this is it. I have work many braces on left and right legs for my knees. I have had my Defiance III braces for 3 years and will say they are super strong and durable. The provide maximum support for me. I replace the pads every 4-6 months and pretty easy to do on your own.
    Love these brace like they were my own leg
    Pros: Strong, impact resistant, look good, replaceable padding, custom fit
    Cons: Bulky, can't get squeeky hinges over long term use.
    Posted on October 26, 2018

    Great brace - wish it had more

    Reviewed by:
    Verified Purchase
    Brace fits and feels great but for $900 it should've come with an under sleeve and any tools that I need to adjust the brace.
    Share Your Usage: Preventing Injury, Recovering from Injury, Occasional Use, Recently Injured, Daily Use, Sports
    Posted on June 8, 2018

    Works great!

    Reviewed by:
    Verified Purchase
    I got this brace recently, and have skied on it once so far.

    It took a little bit of tweaking location and tightness of the straps, but after a couple of tweaks, it virtually disappeared.

    When skiing, if you're not crashing, you're not trying, so of course I crashed. My braced knee came out unscathed, the only unforeseen circumstance is my other knee got a wee bit bruised from the brace.

    Way better than another ACL/MCL/Meniscus injury/surgery/recovery!
    Pros: Virtually disappears in use, provides great peace of mind to be able to return to skiing.
    Cons: Only one very minor one, and not specific to this brace: my other knee got a bit bruised when I crashed from impacting this brace. Any brace would have done that.
    Share Your Usage: Recovering from Injury, Sports, Preventing Injury, Occasional Use
    Posted on February 1, 2018

    Defiance III

    Reviewed by:
    Verified Purchase
    Love this brace, sometimes it pays to spend more. This brace has been great. I since added the patella stabilizer on my brace as well. I completely torn my acl and partially torn mcl. I have to put surgery off for a while due to job and insurance reasons and so i decided to get measured for a custom fit brace. Thanks to this brace I can walk normal and go back to work. Order and delivery was fast. Thank you.
    Pros: Fits perfect - lots of braces available to add on
    Cons: Pricey but again sometimes it pays to spend more.
    Share Your Usage: Daily Use, Preventing Injury, Recovering from Injury, Sports, Recently Injured
    Posted on September 13, 2017

    brilliant solution

    Reviewed by:
    Verified Purchase
    I have Defiance III's for both knees. After 30 years of playing hockey my knees would not fetch a plug nickle at a rummage sale. Both medial compartments have arthritis, the ACLs are barely hanging on, the menicus look like a thin shag carpet with holes, and the MCLs are stretched. I wear them for hiking, rock climbing, skiing (both alpine and nordic) and work outs. They perform way beyond my, or my Doctors expectations. Three hour hikes in steep mountain terrain or a day spent climbing overhangs are not a problem.
    Pros: The custom fit is perfect, they stay in place. No need for a sleeve. Rugged construction. The tech who fit me was terrific.
    Cons: none - they let me do the things I love
    Share Your Usage: Chronic Instability, Preventing Injury, Recovering from Injury, Sports, Recently Injured
    Posted on July 21, 2017

    Great product!

    Reviewed by:
    Verified Purchase
    Great product for intense activity -- I play a very high level of soccer still (I'm almost 30) and the Defiance III holds up really well. I had a grade 3 MCL tear (didn't need surgery) and was in a full hinged brace for two months. I then went through 3 months of PT before going back to soccer. I wanted to feel extra safe when I went back to playing and I can confidently say this product mentally and physically puts me at ease. The fitting process was simple and the product was shipped quickly.
    Pros: Works as described and is more comfortable than I expected. It's really lightweight and I don't feel restricted while playing soccer.
    Cons: The only con is that the outside metal piece with the DonJoy logo on it has already fallen off, so it looks kinda strange to see the bolts underneath.
    Share Your Usage: Recently Injured, Sports, Preventing Injury, Recovering from Injury
    Posted on May 16, 2017

    Great brace, I feel very confident returning to the field.

    Reviewed by:
    Verified Purchase
    The measuring and fitting process went very well, they came to my work and it was quick and smooth.
    Posted on October 3, 2016

    Exceeded expectations

    Reviewed by:
    Verified Purchase
    I bought this brace for my grandson. He had a couple surgeries to repair an acl issue. He plays high school football, mountain bikes, wakeboards, etc. He loves this braces. It is comfortable and completely supports his knee. It provides him the confidence to be active at the level he is accustomed to. I highly recommend this braces as well as Better Braces, especially their customer service.
    Posted on September 13, 2016

    Great product, gave me back my mobility!

    Reviewed by:
    Verified Purchase
    I have osteoarthritis in both knees. I am bone on bone on my right knee, but stubbornly have refused to give up tennis - I play 3-4 times per week. After two hours of playing I would be in considerable pain. I received my Defiance III last week and haven't felt any pain at all! I played for 3.5 hours last Friday and another 2 hours on Saturday, then walked five miles on Sunday with absolutely no pain at all! While nothing short of a new knee will fix the problem, this brace has really helped me out!
    A word of caution though, the knee sleeve is a must as (at least with me) the top strap tends to chafe. Also, if you are going to wear this under your pants, make sure they are baggy, the hinges tend to stick out a bit.
    Posted on October 2, 2015