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DonJoy

FullForce Ligament Knee Brace

Attention Medicare Patients

Provides protection of the ACL for athletes who don’t want to lose speed by weighing themselves down with a heavy brace.
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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 exactly 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.
Strong Aircraft Grade Aluminum Frame
You get the benefits of a lightweight and low profile knee brace that is also strong, thick and stable.
Swiveling, Internally Mounted 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.

Is the FullForce Ligament Brace Right for me?

A lightweight brace that provides ligament protection for non-contact sports (basketballs, running, tennis, golf). Ideal for hyperextension prevention, ACL or PCL recovery and MCL or LCL instability. 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
  • MCL or LCL instabilities
  • After ACL reconstruction surgery
  • CI represents combined instability. It will address
    both ACL and PCL instabilities.
  • Meniscus Injury
  • Hyperextension

Best for:

  • Baseball
  • Cycling
  • Football (practice)
  • Hockey
  • Lacrosse
  • Walking & Hiking

A Lightweight Brace That Provides ACL Protection

The DonJoy FULLFORCE knee brace is for protecting the ligaments of the knee, especially the ACL, from injury.

The FULLFORCE is most commonly worn by competitive athletes who suffer from any of these conditions, can't afford to be weighed down by a heavy brace, and are not trying to prevent contact or impact related injuries (like a football lineman might want to do).

This knee brace is designed to provide complete protection of the knee for competitive athletes.

who are at the greatest risk for injuring their ACL. Utilizing DonJoy’s 4-Points-of-Leverage system and the FourcePoint hinge, knee instabilities are continually corrected. This means an injury doesn’t have to occur for this brace to work - it significantly decreases your chance of getting hurt in the first place!

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 properly fit your DonJoy FULLFORCE knee brace.

Click on the video tab for directions on how to get the proper fit.


Shop our complete selection of knee braces, browse additional DonJoy products or FullForce replacement parts.

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Product Questions

Hi, I’m interested in the DonJoy Full Force Ligament Knee Brace. My question is what’s the difference between the CI or ACL option.
Question by: Locke on May 5, 2010, 10:42 AM
The difference between the CI and the ACL option for the DonJoy Full Force Ligament Knee Brace is the strapping sequence. The ACL option has 5 straps; 2 posterior thigh, 2 anterior calf, 1 lower posterior calf. The CI option has all 5 straps the ACL option has plus 1 extra strap on the anterior thigh.
Answer by: Admin on May 5, 2010, 10:42 AM
Is this brace effective when worn over pants? I am a healthcare provider and this does NOT Fit under my scrubs. If it is still effective over a scrub type pant, I'd prefer to wear it that way than have to purchase an entire new set of uniforms.
Question by: Allie c on Jun 22, 2016, 6:30 AM
The FullForce Ligament Knee Brace may be worn over pants, but you may have issues with it slipping, as it is designed to be worn directly against the skin.
Answer by: Admin on Jun 22, 2016, 6:30 AM
My 14 you son haa had a partial menisectomy and repair to the right lateral.The cartilage over the bone is torn due to unalignment of the bone. It cannot be reapaired.I thought the OA adjuster would be beneficial because he plays basketball. However, the orthotics dept sent an OA fullforce. I also purchased the OA reaction. Is the OA fullforce OK or should I exchange it for the OA adjuster? And is the OA reaction ok?
Question by: Nikki on Apr 23, 2016, 8:46 AM
The OA FullForce is a lighter lower profile brace and would be better for someone playing sports than the Adjuster. The OA Reaction is also ok and can be used. The OA reaction is for mild OA, the FullForce moderate.
Answer by: Admin on Apr 23, 2016, 8:46 AM
How come in some pictures there is an extra strap across the lower thigh and in other pictures there is not?
Question by: Matthew on Jan 5, 2016, 7:40 AM
When you order the brace you will be asked which knee compartment you want. The ACL is the strapping with no anterior thigh strap, and the CI strapping has that anterior thigh strap.
Answer by: Admin on Jan 5, 2016, 7:40 AM
Hi, ive been looking through some of the braces and cant quite figure out the best fit. I recently reinjured my mcl/pcl. I also have osgood-schlatters and chondromalacia. i was wondering what brace would alow me to keep playing hockey?
Question by: derek on Jan 5, 2016, 11:52 AM
The Playmaker II knee brace will protect both of those ligaments and you an get the brace with a patellar donuts to support the kneecap. The brace can be worn while playing hockey
https://www.donjoystore.com/donjoy-playmaker-ii-knee-brace
Answer by: Admin on Jan 5, 2016, 11:52 AM


Circumference measurements should be taken at the knee center, 6" (15cm) above knee center and 6" (15cm) below knee center.


    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.