11-14XX-X 11-14XX-X 988.99

DonJoy Armor Knee Brace with FourcePoint Hinge

Strong and supportive off-the-shelf brace for contact sports with added ACL support via the FourcePoint Hinge.

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

Alternative Product Solutions


The updated Armor Knee with Fourcepoint Hinge offers a low-profile fourcepoint hinge that's flush with the frame, so it can be easily worn under your snow pants, and is light so it won't weigh you down on the slopes. The low-profile hinge reduces the need for the deflector while still providing protection for ACL, MCL, LCL or Meniscus instabilities, which prevents the hinge from "getting hooked" with other braces or knee. Designed with internal strap tabs to reduce the risk of the tabs breaking and delivers comfort and security when in motion. The Armor Knee is available in short or standard calf sizes, so you can choose the length you need for a more customizable fit-and it won't interfere with your ski boot.

Features & Benefits

  • 4-point leverage system helps reduce strains on the ACL
  • Low-profile hinge delivers protection without limiting range of motion
  • Adjustable straps to help secure and personalize the fit
  • Made of aircraft aluminum
  • Anti-migration supra condyle pad to help keep the brace in place during movement
  • Designed to support and protect moderate to severe ACL instabilities, recovery from ACL reconstructions, MCL or LCL instabilities, meniscus injury, hyperextension prevention (not recommended for PCL injuries or instabilities)
  • Best for baseball, softball, basketball, football, hockey, lacrosse, skiing, snowboarding, motocross, volleyball

Size Chart & Fit Guide

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

Size Thigh Knee Center Calf
XS 13" - 15.5" (33-39 cm) 12"-13" (30-33 cm) 10"-12" (25-30 cm)
S 15.5" - 18 .5" (39-47 cm) 13"-14" (33-35 cm) 12"-14" (30-35 cm)
M 18.5" - 21" (47-53 cm) 14"-15" (35-38 cm) 14"-16" (35-40 cm)
L 21" - 23.5" (53-60 cm) 15"-17" (38-43 cm) 16"-18" (40-45 cm)
XL 23.5" - 26.5" (60-67 cm) 17"-19" (43-48 cm) 18"-20" (45-50 cm)
XXL 26.5" - 29.5" (67-75 cm) 19"-21" (48-53 cm) 20"-22" (50-55 cm)
XXXL 29.5" - 32" (75-83 cm) 21"-23" (53-58 cm) 22"-24" (55-60 cm)
    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.


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DonJoy Armor Knee Brace with FourcePoint Hinge

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    Customer Reviews 13 item(s)

    Light and durable

    Reviewed by:
    Verified Purchase
    Much better design than any cal braces I have used. I'm skiing with no ACL in my right knee(after its been repaired previously) and this is by far the lightest and most supportive brace I have ever tried. Ive lost three acl's so far and skied as much as possible without it being repaired and this brace is the true solution for me.
    Pros: Lightweight, durable, doesn't slip as much as other braces.
    Cons: Can't put it on after your boot is on
    Share Your Usage: Preventing Injury, Recovering from Injury, Daily Use, Recently Injured, Chronic Instability, Sports
    Posted on January 2, 2018

    Helped me play in 5 football games hurt without pain!

    Reviewed by:
    Verified Purchase
    The straps started to come undone from the stitching, but that was an easy fix. Other than that all around great brace! Held up in 5 full contact football games.
    Pros: Strong and sturdy
    Cons: Stitching came undone in a game
    Share Your Usage: Preventing Injury, Sports, Recently Injured
    Posted on November 20, 2017


    Reviewed by:
    Verified Purchase
    I did not have any surgery on my knees but I do have these as preventative from getting injured in football. I have had many instances in which if I did not wear these, I would probably need surgery. It fits comfortable and is overall great in my opinion. If you can afford these as preventative, it is worth the buy. 2 other teammates on my team have these and they work great on them too.
    Cons: They slip down kinda easy but you just have to pull them back up.
    Share Your Usage: Preventing Injury
    Posted on October 12, 2017

    Worth the price

    Reviewed by:
    Verified Purchase
    I destroyed my ACL about 2 years ago while skiing. I was given a rigid neoprene brace at the mountain clinic that worked just fine. No surgery so I'm using my braces as my ACL. The only problem I had with the neoprene braces was the smell/sweat and their tendency to begin to come apart over time. SO I decided to bite the bullet and get the Donjoy brace. It has preformed very well (as good as my neoprene braces which is all the praise I can give as I still have not had surgery). The mesh bag makes keeping it fresh easy and it is cooler (both physically and metaphorically) then my old braces.
    Pros: Fit Feel Structural soundness Just a great brace
    Cons: Cost (but worth it)
    Share Your Usage: Preventing Injury, Sports
    Posted on June 14, 2017

    A great brace

    Reviewed by:
    Verified Purchase
    The brace works great! The type injury I had was, reconstructive ACL. I also tore the MCL, LCL and tore both meniscus at the same time. I do valet parking for a living and I was very scared to go back to work but, this brace gives me the support that I need. It has great flexibility and moves with great ease even after wearing it for eight hours at a time. After wearing it a couple hours I forget it's even on. There are other cheaper braces out there, but after the research I think this one it is the best one.
    Pros: Comfortable fit, very smooth and great Velcro that can be used time and time again.
    Cons: I can see how a custom brace would fit better, but the price difference is huge to make me be satisfied with the non-custom brace.
    Share Your Usage: Sports, Recently Injured, Chronic Instability, Occasional Use, Preventing Injury, Recovering from Injury, Daily Use
    Posted on April 19, 2017

    Hinge rivets are loosening

    Reviewed by:
    Verified Purchase
    Had this brace for about 1 years after an ACL reconstruction surgery. Only wore it when I worked out at the gym. It's been an excellent brace and it's made me feel confident in my knee when I wear it but just concerned on the longevity of the brace. The rivets are loose and just worried if that this is normal or if it's gonna get worse to were the brace will not be good to wear anymore. Wonder if Donjoy could repair it?
    Pros: Very supportive
    Cons: Rivets holding it together makes question how long the brace will last
    Share Your Usage: Recovering from Injury
    Posted on March 17, 2017
    Hi Chris - DonJoy Armor comes with a 12 month warranty. Please check your receipt to see if you are within the warranty or contact customer service for assistance.
    24 Jul, 2018

    Awesome brace!

    Reviewed by:
    Verified Purchase
    Love this brace, it gives my daughter and myself a sense of relief. Since she just started playing soccer again.
    Pros: Good protection, it's legal to wear on the field for both high school and club.
    Cons: We've already had to exchange once for defective hinges, we were told it was very durable, non breakable by our representative, my daughter fell during game and hinges broke, metal bent, and it wasn't a bad fall either. Prior to that it was squeaking badly. She needs it to play, now I'm not sure if we'll be able to replace it. This shouldnt happen considering what we paid for it and she just started to wear it 5 months ago. Wears it two to three times a week only. I'm afraid she will not be able to play anymore unless a miracle happens.
    Share Your Usage: Occasional Use, Preventing Injury, Sports
    Posted on February 18, 2017

    okay but now clicks

    Reviewed by:
    Verified Purchase
    The brace takes a little getting used to. Rubs and scratches a bit until you break it in. Unfortunately after only about 2 weeks usage one of the hinges now clicks when bending my knee. Very irritating. Can't figure out how to get it to stop.
    Pros:  Very tight fitting and gives you a mental sense of comfort. Physically very stable.
    Cons: Scratches and rubs the skin leaving minor abrasions in several locations. After a couple weeks of usage the hinge developed a clicking which is very irritating.
    Share Your Usage: Recovering from Injury, Sports
    Posted on January 28, 2017
    Hi James, thank you for your feedback. Sorry to hear about the rubbing. Try an undersleeve to help with the rubbing. Cotton/Lycra Knee Undersleeve: https://www.betterbraces.com/knee-brace-undersleeve-cotton-lycra Neoprene Knee Undersleeve: https://www.betterbraces.com/donjoy-neoprene-knee-brace-undersleeve As for the clicking, please contact customer service for assistance. Thank you, Customer Service
    30 Jan, 2017

    Makes me feel like Batman in The Dark Knight Rises

    Reviewed by:
    Verified Purchase
    I'm 5 weeks post op ACL reconstruction with patellar autograft. It's been a painful journey but the post-op brace given to me did not fit and didn't offer any protection during walking. Compression sleeves and ace wraps offered no comfort or protection esp. from hyperextension.

    Just feels odd that im given so much activity and exercises by PT and surgeon yet im given no brace for aid. so i decided to get this brace not only for work (when i start in a few weeks) and for walking and ADLs.

    Sizing my leg was weird as i found that my thighs were large compared to my body size yet i measured out to a small. I went and got a small and it fit pretty snug.

    It was a little too tight by the supra condylar pad which i decided to adjust manually by re applying at an angle to better accommodate my condyle landmark on my affected inner knee.

    It worked like a charm. fits tight but like a glove. when i stand i adjust the straps and im off. wear it all day and forget about it. no more hyperextension!

    sports wise im not sure yet but guaranteed this thing is low profile but for contact sports it'd be a risk to others (its made of strong aluminum and plastic).

    i don't see this being a hindrance during activity but can definitely give stability and protection. im walking much better. no more limping during my initial steps. it helps stabilize my weak knee joint.

    Pros: As stated in review
    Cons: No instructions on how tools and tension can be increased. im not even sure what factory setting this brace is set when looking at the inner hinge. I wish supra condylar pads came in different thicknesses. different thicknesses can help give a more customized fit to those who need it without having to do any major adjustments. just like different sized earbuds in that come with headphones. comfort is subjective, give people an easy option without having to opt for a fully customized brace would be great for the off shelf high end brace. supra condylar pads are tricky, the ridge adds additional width to the pad making it hard if the brace is snug to begin with. i'd happily spend money on extra multi sized supra condylar pads if possible.
    Share Your Usage: Daily Use, Sports, Preventing Injury, Recovering from Injury, Occasional Use, Recently Injured
    Posted on January 28, 2017
    Hi Rod, thank you for your feedback.
    30 Jan, 2017

    Very well built, Very well thought out, I will say if it fits your leg properly it is the best brace for the money available. From time of ordering to delivery is smoking fast!

    Reviewed by:
    Verified Purchase
    My leg must be totally different then others! The top support bracket seems to be canted a little extreme. The inner knee pad with the lump seems to put a extreme amount of pressure on my inner knee area. Just laying in bed relaxing seems to still put abrasion and pressure on inner knee area. Adjusting the straps to what I feel is proper tension to prevent unit from sliding down seems to prevent blood flow. The device is very well made but the comfort is horrible for my knee configuration. I emailed you a question regarding sizing and no body ever got back with me. My calf size is medium, my thigh size is medium but my knee size is large!!! This is where the problem lies. My knee is pretty damaged. As the hinge pivots it seems to place more pressure on inner knee the more it goes to the end of its range. My leg is probably twisted and knee position is probably different then the normal person for your brace seem cocked to one side when installed. The top support metal part open end seems to be apply pressure to the top inner part of thigh area. Seems like if the knee area could be widened it would fit better.
    Posted on December 3, 2016