11-14XX-X 11-14XX-X 549.99

Armor Knee Brace with FourcePoint Hinge


Availability: In stock

The strongest and most supportive off-the-shelf option for contact sports with added ACL support via the FourcePoint Hinge.

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Product Details

Product Description

Features & Benefits:

Four-Points of Leverage Dynamic System
This patented technology was developed to reduce the strain on the ACL by distributing the load placed on the ligament via four points.Click here to learn how the Four-Points of Leverage works.
FourcePoint Hinge Technology (Stop kit not included)
Makes you less likely to suffer from an ACL injury because it reduces the amount of time your knee is in an "at risk position", enhances the Four-Points of Leverage by increasing the posterior load applied by the brace on the tibia, and improves your natural gait by applying progressive resistance before reaching a firm end point during movement.
Adjustable Extension Resistance
The FourcePoint Hinge enables you to set the flexion angles (25˚, 35˚ (factory setting), 45˚, 55˚, or 65˚) based on your condition or point of recovery. This puts you in control where the degree of tension stops.
Available in Standard and Short Calf lengths (Ski/Snowboard Boot and Motocross Compatible)
Now you can choose the calf length to further customize the fit of your knee brace. The short calf length is recommend if you will be wearing ski boots or similar items at the same time as your knee brace.
Aircraft Aluminium Frame
You get the benefits of a lightweight and low profile knee brace that is also stronger, thicker, and more stable than the other lightweight knee braces on the market.
Anti-migration Supra Condyle Pad
Your knee brace will stay in place no matter how active you are.

Is the Armor with FourcePoint Hinge right for me?

Supportive knee brace for individuals with knee ligament instabilities and athletes involved in extreme or contact sports. Still not sure? Try our Brace Advisor for personalized product recommendations to meet your needs!

Designed to treat and protect:

  • Moderate to severe ACL instabilities
  • Recovery from ACL reconstructions
  • MCL or LCL instabilities
  • Meniscus Injury
  • Hyperextension prevention
*Note: this product is NOT recommended for PCL injuries or instabilities.

Best for:

  • Baseball & Softball
  • Basketball
  • Football
  • Hockey
  • Lacrosse
  • Skiing
  • Snowboarding
  • Motocross
  • Volleyball

Reduce Your Chance Of ACL Injury When You Wear This Brace

The DonJoy Armor knee brace with FourcePoint Hinge Technology is the brace to use if you are an extremely active individual or athlete who suffers from an ACL or MCL instability or injury. Offering the same features as the standard Armor brace, this model is equipped with FourcePoint hinge technology - clinically proven to provide additional ACL protection by reducing the time spent near full extension (otherwise known as the "at risk" position). The hinge enhances DonJoy's 4-Points-of-Leverage System by dampening knee extension, and reducing shear forces at the knee.

The Armor brace is the strongest and most supportive brace you can get without a prescription. If you are concerned about protecting your ACL during sports or high impact activities, the Armor knee brace with FourcePoint Hinge Technology is the best brace for your needs. Our low profile hinge combined with our internally mounted straps promote bilateral use that won't impede performance. The steel reinforced hinge plate and enhanced aluminium frame deliver uncompromised strength and proven protection. There are numerous publications to support the 4-Points-of-Leverage FourcePoint hinge.

This brace is suited for any active individuals with ligament instabilities and athletes involved in extreme or contact sports brace like football, skiing, snowboarding, motorcross, surfing, wakeboarding, and more.

Sizing and Measurements

Click on the Size Chart tab above to learn how to measure your leg to determine what brace size you need.

Instructions for Use...how to put on your DonJoy Armor Knee Brace.

To ensure you are properly applying your brace, click on the Video tab above and watch our Fitting Video.

Need Replacement Parts?

Shop DonJoy Armor Replacement Parts for strap kits, condyle pads and more.

Shop our complete selection of knee support or browse additional DonJoy products.

Size Chart & Fit Help

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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  • victor at 06/06/2014 18:56
    • Why this armor is not recommended for PCL lesions?
    • The Armor itself is okay for PCL injuries, as you can get PCL strapping. However, the fourcePoint hinge is contraindicated for PCL injuries. The fource point hinge will give resistance during the last portion of extension, which will increase force placed on the PCL to give protection to the ACL.
  • Tae at 05/05/2014 04:26
    • hey, i had my acl reconstructed two weeks ago i play soccer and i want to buy a DonJoy Armour. But the problem is I'm in Thailand, can you ship the brace to Thailand? and what is the fastest way to ship an item to Thailand?
    • To order this brace and have it shipped to thialand please contact:

      Ms. Joe Cheung

      Customer Service Executive

      Brands: Aircast, DonJoy, Dr. Comfort, ETI, ProCare

      Primary Email: joekitping.cheung@djoglobal.com

      Phone: +852.31.05.1415

      Location: Hong Kong
  • Coach Richard at 03/04/2014 21:18
    • My son tore his ACL and strained his MCL. He had ACL surgery but he is complaining about is MCL not being supported with his knee brace. He is very active in sports, especially football. What brace do you recommend to help support his MCL?
    • Richard
      The Armor Knee Brace with the fource Point hinge would be a good brace for your son. It will protect both ligaments and privid him support to prevent any further injury. The brace is made of a tough aluminum and is made for contact sports. The FourcePoint technology along with the Strapping system will protect the knee form re-tear of ACL . The bilateral hinges will give him support of the MCL.
  • Doug Sheppard at 26/01/2014 19:59
    • I have been looking at this brace for a while as MRI's i have had indicate I have moderate to severe scarring on my MCL (Dr said that indicated numerous micro tears but never a complete rupture?) from previous hockey, skiing, and snowboarding injuries (mostly from hockey). I have delayed purchasing this brace as I have been looking for confirmation in previous questions that this will suit my purposes of daily wear to improve stability and also provide enough support when continuing those sports. My measurements are as follows:
      Thigh: 23 1/4
      Knee: 17
      Calf: 16 1/2
      Based on the above measurements I would assume a Large sized brace with short calf option would be what I am after? Would this be correct?
      Last question, do you ship to Canada?
    • Doug
      You are correct, you would need a large brace witha short thigh. We do not ship internationally. Here is the information on how to get az brace from DJO Canada


      DJO Canada


      Aircast, Chattanooga, Compex, DJO Surgical, DonJoy, Dr. Comfort, Empi, ETI, ProCare


      DJO Canada

      Primary Email:





  • Mary at 11/11/2013 03:51
    • My son is a wrestler with a torn ACL but where he feels no pain and had wrestled with it in that condition for several weeks before getting it diagnosed. Because he would like to postpone surgery until after the season, we have been directed to investigate the DonJoy Armor Knee Brae with Fource Point hinge. Would this be appropriate for a wrestler?
    • Mary
      Thank you for contacting product support. I do not believe he would be able to wrestle with the Armor knee brace on. It is a rigid knee brace made of Aluminum and either would have to padded or would be banned from wearing it at all during competition. I would check with his coaches and see what is permissable to wear during competition. Most likely he would not be able to wear anything that an opponent could grab onto. If he could wear a soft hinged knee brace, I would suggest the Playmaker available here: https://www.betterbraces.co.uk/donjoy-playmaker-ii-knee-brace-1, but this might not even be allowed.
  • Ivan at 05/11/2013 17:24
    • Will the DonJoy Armor Knee Brace with FourcePoint Hinge provide support to the leg at the knee level when while walking your leg fails you and you tend to fall.
    • Ivan,
      The Armor with FourcePoint Hinge will provide support to the ACL/MCL/LCL. It will damper the extension of the leg when going into extension and decrease the amount of time the ACL is in the "at risk" position.
      You may want to look at the DonJoy Deluxe Hinged Knee Brace. This will offer you some compression as well and the hinged uprights for added stability.
      Thank you for your question and please contact us if you'd like any more information.
  • Vanessa at 16/07/2013 02:11
    • I have had an ACL reconstruction and my meniscus was really bad so after. They recommended this brace and now that I have had it for a lot less than a year and have been playing in it. The straps are started to stretch and the padding is starting to get ruff and come apart. I was wandering if there was some kind of warranty for that sense it hasn't been that long.
    • Hello Vanessa,

      Your Brace Frame has a 1 year warranty, the straps and pads have a 6 month warranty.

      You can purchase replacement straps and pads at the link below.


      Thanks for Contacting Donjoy.
  • Aren at 11/02/2013 02:46
    • Hi,

      I injured my medial meniscus in HS and have reaggravated it on several occasions over the last decade. I injured it again last week playing hockey when I took impact to the outside go my leg. I would like a brace that could give me support playing a physical sport like hockey while still giving me range of movement. I have never been diagnosed with acl or mcl tears. What knee brace do you recommend?

    • Hello, Aren -

      The DonJoy Armor Knee Brace is the most highly recommended for high contact/collision activities such as hockey and football. Because you have medial meniscus injuries and no ACL or MCL involvement, you probably do not need this type of rigid frame brace. We would recommend the DonJoy Reaction as more of an appropriate choice.


      This would allow for minimal to no limitation in your range of motion and still provide appropriate support to your medial meniscus.

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

      Thank you and have a wonderful day!
  • matt at 06/06/2012 18:34
    • Should this brace be able to handle sliding in baseball/softball? And also I ruptured my acl and I currently own this brace but was wondering if the fourcepoint hinges are good for this injury or should I disengage them so they act as a standard hinge? I wanted the fourcepoint so that after I have surgery which probably won't be until November, I could use it during my recovery as well.
    • The Armor with FP hinges would be the best product for your condition and activity level. The FP hinges are the only hinges clinically proven to protect the ACL specifically.
  • Ruben Ramirez at 12/05/2012 00:19
  • Abbas at 21/03/2012 20:22
    • I tore my ACL a couple of years ago playing soccer and never had a reconstructive surgery. I got to the point where I am running 3-4 miles and doing plyometrics after he injury. I played some flag football yesterday for the first time since injury and had no brace on. The knee felt good sprinting and cutting but I feel a little irritation in knee today. I am now trying to get back into soccer but still a little scared and nervous. What knee brace would you recommend for playing soccer and contact sports with a torn ACL?

      Thanks in advance.

    • Donjoy Armor with FP Hinges for contact sports to protect the ACL.
  • Phil Ingram at 12/01/2012 18:25
    • I ride motocross and have both LCL and MCL injuries due to hyper-extension and straight legged impact. I am looking for the best support from re-injury but to also minimize discomfort when riding, running, etc. Will the fource point hinge be too restrictive when riding my bike?
    • The Armor with FP hinges would be recommended to prevent hyperextension. The lbs. of pressure can be adjusted for functional purposes. Should you have any questions give us a call at 888-405-3251.
  • Jane at 24/01/2011 15:26
    • How much does the armor brace weigh?
    • 1.35 lbs
  • Todd Rovello at 30/11/2010 15:29
    • I am 3 weeks out of ACL reconstructive surgery, and researching which brace might be best for me. My MCL was torn as well. I lead an active lifestyle, but my main concerns are walking rough, uneven terrain for my job. I also participate in watersports, some snow skiing, and coach fastpitch softball. Contact sports are a thing of the past for me. Any advice would be appreciated.
    • Hello Todd,

      The Armor Knee Brace will definitely assist in the ACL recovery and support, as well as provide stability to the knee.

      If contact sports are not a concern, a DonJoy Legend SE-4 Knee Brace (https://www.betterbraces.co.uk/donjoy-legend-se-4-knee-brace-41) may be preferable to an Armor as the armor is typically used for athlete level protection..

      If a rigid brace is not a requirement, we also have:

      DonJoy Drytex Playmaker Wraparound/Sleeve

      DonJoy Deluxe Hinged Knee
  • André at 22/05/2010 01:48
    • What's the difference between the standard and short calf lenght? Is it the same performance?
    • Standard calf: 16"
      Short calf: 14"
      (total length of brace)

      A shorter calf on the DonJoy Armor is recommended for shorter individuals (under 5'7) and patients who ski or ride motocross. The length of the brace has no effect on the functionality of the brace.
  • Al at 02/04/2010 21:35
    • What's the difference between this brace and the regular Armor? I can't figure out why this one costs $50 more...
    • The difference is due to the fact that this brace comes equipped with FourcePoint hinges.

      The DonJoy FourcePoint Hinge protects the ACL. The FourcePoint Hinge enhances the DonJoy Four Points of Leverage system by damping knee joint extension, improving the brace's mechanical performance, and reducing knee shear forces. The FourcePoint Hinge utilizes a spring mechanism to apply a gradually increasing amount of resistance during knee extension. The resistance reduces the time spent near full extension, or in the at risk position, increases the posterior load applied by the brace on the tibia to prevent anterior tibial translation, and gives patients a more natural gait by applying progressive resistance before reaching a firm end point.

      The resistance can start at flexion angles between 25° and 65° and engages during the last 25° of extension prior to coming to a hard stop. Five different resistance levels are available to meet rehab protocol specifications and provide comfort. The resistance can be adjusted using the supplied allen wrench to modify the set screw placement. The same wrench can be used to turn the resistance completely off by simply flipping a switch.

      Because the hamstring insertion angle increases and the quadriceps become mechanically disadvantaged as the knee becomes more flexed, anterior shear forces on the tibia and ACL strain are reduced. Therefore, athletes returning to sport after an ACL reconstruction who wear a DonJoy ACL brace equipped with FourcePoint Hinges can protect themselves while engaging in activities involving the run-stop-jump task.
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