Armor Knee Brace with Standard Hinge


Attention Medicare Patients

Provides active people with protection from ACL, MCL, or PCL injuries. This is one of our supportive knee braces that you can get without a prescription.
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One of Our Best Off-the-Shelf Knee Braces

The DonJoy Armor knee brace is the brace to use if you are an extremely active individual or athlete who suffers from an ACL, MCL, or PCL instability or injury. If you're concerned about preventing a ligament injury, try the Armor. It's one of our supportive knee brace that doesn't require a prescription and it also helps minimize your chances of suffering from one of these painful injuries.

The Armor is ideal for athletes who play football, ski, snowboard, ride motorcross, surf, wakeboard, or participate in similar high impact sporting activities.

The DonJoy Armor knee brace is used to treat or prevent the following injuries:

  • Moderate to severe ACL or PCL instabilities
  • ACL/PCL combined instabilities (CI)
  • Recovery from ACL or PCL reconstructions
  • MCL or LCL instabilities
  • Hyperextension

Product Features…and the benefits you’ll experience!

  • Available in ACL, PCL, and CI Versions
    You get to choose the brace that is right for your injury, which means your knee will get the proper support where you need it most.
  • 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 exactly how the Four-Points of Leverage works.
  • Custom Frame and Swiveling Strap Tabs
    Get a perfect fit by molding the brace to your knee, as well as enhance the fit and suspension of the brace with the swiveling strap tabs.
  • 6061 T6 Aircraft Aluminum Frame
    Wear a strong, thick and stable knee brace that is lightweight and low profile.
  • Anti-migration Supra Condyle Pad
    Your knee brace will stay in place.
  • Calf Pinch Guard
    Provides a smooth transition between boot and calf cuff so you’ll never pinch your calf again. This is an add-on accessory that is purchased separately.
  • Impact Guard
    Protects the shin and knee against blunt blows, as well as prevents you from ripping pants or uniforms. This is an add-on accessory that is purchased separately.

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 braces or browse additional DonJoy products.

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Product Questions

My thigh and calf measurements place me in the medium size range but my knee size does so in the large range. Which size would fit best?
Question by: Rick Garcia on Sep 19, 2010, 7:47 AM
Hello Rick,

Send us an email @ with your measurements so that I can give a more accurate recommendation.
Answer by: Admin on Sep 19, 2010, 7:47 AM
Is this brace good for me to play volleyball? i torn my acl, mcl, meniscus in 4 places, & sprained my pcl. Should i get another brace or this one?
Question by: Whitney on Jan 17, 2011, 5:12 PM
Hello Whitney,

The DonJoy Armor is a great rigid brace. If you want the same protection in a lighter brace, also check out the DonJoy Full Force Ligament Knee Brace.
Answer by: Admin on Jan 17, 2011, 5:12 PM
I had a ACL repair but after playing soccer post rehab it got a little loose on me. Now when I play any type of dynamic sport my knee gets a little loose. What brace should I choose the full force. Defiance. The only dynamic sport I do now without instability is skiing. But I would like tp play soccer and b ball with my kids.
Which would be the best choice defiance, full force ?
Also what difference between rx braces and off the shelf. Thanks. Ken
Question by: Ken on Jan 3, 2011, 5:50 PM
Hello Ken,

The DonJoy Defiance is a custom knee brace that is built specifically to your measurements. Because of this, the Defiance will always be the best rigid brace we carry in support and ACL protection.

The DonJoy Fullforce is a great top of the line off the shelf brace (meaning sized like small, medium, large). This brace will add support and stability to the knee and help protect the ACL.

Neither braces will require a prescription.

Either brace will fit the application and activity level you described.
Answer by: Admin on Jan 3, 2011, 5:50 PM
1. What is the difference in inches between the "standard" and "short" size?

2. What part of the brace is shorter on the "short" size, the part of the brace which is below the hinge or above the hinge?

3. I am purchasing the brace primarily to avoid knee hyper-extension ( PCL protection?). I see that in the "Knee Compartment" section above there are three options in the "Choose option..." box: ACL, CI and PCL. Does each of these represent a slight variation in the brace and if so, what are the variations?

Thank you.
Question by: Franz on Jan 5, 2011, 5:55 AM
Hello Franz,

1. 1 inch
2. Calf Cuff
3. The strapping sequence changes to address the ACL, PCL or both, (CI or combined instability)
Answer by: Admin on Jan 5, 2011, 5:55 AM
I have an extreme bone contusion in my right knee on my Tibial Plateau. I am a serious wakeboard, and a high school pole vaulter. I am wondering about the support this brace will have on the bones in my knee? also i would like to know if it would prevent future bone contusions in my knee?
Question by: John Jacobs on Aug 31, 2013, 11:41 AM
You should look at the Armor and the knee guard attachment that would give you the most support and protetction, i would also recommend a sports cover for when wakeboarding.
Answer by: Admin on Aug 31, 2013, 11:41 AM

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.