Armor Knee Brace with FourcePoint Hinge


Attention Medicare Patients

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

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)
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. DonJoy has taken hinge design and ACL protection to another level with its patented FourcePoint technology. Note: The Ski Hinge is soon-to-be discontinued. The Armor Hinge offers the same protection. Select a short calf length if using for skiing or snowboarding.
Reducing the risk of ACL injury to the contralateral knee
Wearing NO knee brace (results at 6-12 months post-op):
  • 28% deficit in joint mechanics
  • Asymmetry of mechanics in both knees
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.

Reduce Your Chance Of ACL Injury When You Wear This Brace

Get the strongest, most supportive knee brace for skiing, without a prescription. The Armor Knee with Fourcepoint Hinge has excellent, updated features that make this knee brace worth purchasing without missing features from the soon-to-be discontinued Armor Ski Knee Brace or Armor with Ski Hinge.

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 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.

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.

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Product Questions

What's the difference between this brace and the regular Armor? I can't figure out why this one costs $50 more...
Question by: Al on Apr 2, 2010, 1:35 PM
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.
Answer by: Admin on Apr 2, 2010, 1:35 PM
What's the difference between the standard and short calf lenght? Is it the same performance?
Question by: André on May 21, 2010, 5:48 PM
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.
Answer by: Admin on May 21, 2010, 5:48 PM
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.
Question by: Todd Rovello on Nov 30, 2010, 7:29 AM
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.donjoystore.com/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
Answer by: Admin on Nov 30, 2010, 7:29 AM
What's the difference between the Armor and the Ski Armor styles?
Question by: Brandy on Oct 12, 2015, 1:08 AM
The Ski Armor is an older brace with our older fourcepoint hinge and the brace is a short calf with a deflector on the medial hinge to prevent the brace from hitting the opposite knee. The Armor has been re-designed with a new lower profile fourcepoint hinge so there is no need for a deflector. The brace also comes in a short calf if you need that for skiing.
Answer by: Admin on Oct 12, 2015, 1:08 AM
Hi, I am currently looking for a brace to best support my knee in which I tore my ACL. Ideally, I would like to play soccer. Which brace would you recommend?
Question by: Tyler on Apr 25, 2016, 8:39 PM
The Don Joy Armor with Fourcepoint hinge would be a good choice. The brace is for contact sports and has our fourcepoint hinge that specifically helps to protec the ACL from further injury. This brace would be your best choice for an off the shelf brace
Answer by: Admin on Apr 25, 2016, 8:39 PM

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.