11-32XX-X 11-32XX-X 988.99

DonJoy FullForce Ligament Knee Brace

Provides complete protection of the ACL for athletes who don’t want to lose speed by weighing themselves down with a heavy brace.

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

Alternative Product Solutions


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 bulky 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 highest risk for injuring their ACL. Using 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!

Features & Benefits

  • Fourcepoint Hinge Technology to help reduce the amount of time the knee is in an "at-risk position"
  • Four-Points of Leverage System helps reduce strain on the ACL
  • Designed with strong, lightweight aluminum frame for comfort and durability
  • Adjustable, swivel tab straps for secure fit
  • Designed to support and protect moderate to severe ACL, MCL, LCL instabilities, after ACL reconstruction surgery, combined instabilities (CI), meniscus injuries, knee hyperextension
  • Best for baseball, cycling, football, hockey, lacrosse, running, walking, hiking, and fitness

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 diameter you measure here to choose your size.

Note: Knee measurement is the most important, if you measure between sizes we recommend going up one size for optimum comfort and fit

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 FullForce Ligament Knee Brace

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    Customer Reviews 12 item(s)

    Great to walk without pain

    Reviewed by:
    Verified Purchase
    Had some trouble getting it to fit, but once on the leg it was great to walk without pain. Even walking on our lawn the leg doesn't notice how rough it is and the knee does not complain either when trying to walk through 16 inches of snow. Now I can just step into the brace and pull the straps and off I go. Thanks so much for these great braces!
    Pros: Some info about what to use to bend the metal for calf and thigh would be very helpful.
    Cons: See above.
    Share Your Usage: Preventing Injury, Occasional Use, Recovering from Injury
    Posted on March 26, 2018

    Very comfortable

    Reviewed by:
    Verified Purchase
    This brace fits me perfectly. I wear it for extended periods of time and not only for sport activities. My ACL is torn and I am not yet ready for surgery. This brace keeps my knee supported and I am grateful. No need to pay twice the price for a custom brace.
    Pros: Comfortable
    Cons: Velcro grabs the thin felt cover over the rubber stabilizer
    Share Your Usage: Recently Injured, Daily Use, Chronic Instability
    Posted on January 17, 2018
    Reviewed by:
    Verified Purchase
    It fits properly on my knee. I m feeling confident while playing volleyball again. Does not hinder my movement. Will definitely recommend in case of ACL deficiency and unstable knee joint.
    Share Your Usage: Preventing Injury, Chronic Instability
    Posted on November 6, 2017

    It's a God send if it fits.

    Reviewed by:
    Verified Purchase
    It is a nice design but lacks lateral adjustment. If your leg is perfectly straight then it is a God send. My knee if slightly off to one side and swollen due to the damage it has taken. So my knee size called for size large yet my calf and thigh called for medium. It was extremely uncomfortable for me and caused more pain then I had to begin with. It would be nice to have a place to try it on and have a representative there to help guide you in the right direction. If it works for you then great. I am very sad that it fit me badly. I had such high hopes. I can only say get the brace and try it out it will either work and your life will be much better off or it will not fit and you will be no worse off then before. It is nicely built unit.
    Pros: Very well built. Seems that the lateral support is exactlly what is needed to prevent any further damage.
    Cons: None. If it helps in anyway it is a win win.
    Share Your Usage: Recently Injured, Daily Use, Preventing Injury, Chronic Instability, Sports
    Posted on December 26, 2016
    Hi Ron C, thank you for your feedback. We hope this brace will work out for you. Please contact our customer service for additional advice. They may also be able to recommend a different brace to help you. -Customer Service
    26 Dec, 2016

    Perfect Brace for active athlete

    Reviewed by:
    Verified Purchase
    Excellent fit. After a full month of use, it still fits like the first day received.
    Posted on November 1, 2016

    Ice Hockey

    Reviewed by:
    Verified Purchase
    Tore my ACL and Meniscus while playing recreational hockey. Unfortunately, getting a consultation for reconstructive surgery where I live can have a wait time of 6 months to 2 years! After three months of not being able to play hockey, I decided to purchase this brace based on the brace advisory program they offer on this site. If you are in a similar situation as me, BUY THIS BRACE! The brace itself is super comfortable, lightweight and easy to use. Absolutely zero pain when I got back on the ice! This is the first time I am using a brace and couldn't be happier. The only issue I had with this brace was getting my shin guard to stay snug since the brace does add a bit of girth to your knee area but after a few adjustments, I got everything to fit eventually.
    Posted on May 2, 2016

    Full Force Brace

    Reviewed by:
    Verified Purchase
    I normally don't write reviews but this is a great brace. I tried the DonJoy Playmaker II Brace but it pinched the back of my knee and the patella donut was uncomfortable so I sent it back and ordered the Full Force since the front and back of the brace are open. I don't have an ACL in my left knee for 25 years now and my knee was slipping out of joint at work. I do maintenance so I am walking, bending, kneeling and lifting all day long. This brace does not slip down like the Playmaker brace did. I got the shorter version so I can wear 10" work boots. If you are looking for a brace to wear to work that wont slip, I recommend the Full Force. The brace is extremely comfortable and light weight. Its pricey but you get what you pay for.
    Posted on January 22, 2015


    Reviewed by:
    Verified Purchase
    Has made it possible for me to work on a daily basis without fear of re-injury. Highly recommend this brace
    Posted on April 4, 2013

    Perfect brace

    Reviewed by:
    Verified Purchase
    I play football and baseball in high school. My freshman year I hurt my knee in a football game. I had a stage two tear of my acl and meniscus. Although I didn't have to have surgery my knee continually gave me problems. If I made any type of cutting or pivoting motion my knee would buckle and I would be out for two weeks. I have tried multiple braces and sleeves and this is the only one that was durable enough to keep my knee in place with no problems. It isn't bulky at all, it's super light, and it is built to last! I can't think of anything that could take my knee down while I have this brace on. My only criticism is that the sizing is a little tricky. I would recommend getting the neoprene undersleeve to help keep it from slipping. This brace has allowed me to continue playing sports in high school and it will stay with me as long as I am still active. Thank you DonJoy!
    Posted on June 6, 2012

    Great for ACL reconstruction

    Reviewed by:
    Verified Purchase
    Two of my daughters tore their ACLs within 6 months of each other, and both have this brace. They are able to still play volleyball, and will wear the brace for a year. It is light, but still protective. The sleeve helps when diving, to prevent pinching their skin at the top of the thigh. This will help insure that we do not have to have repair number three!
    Posted on January 6, 2012