Donjoy Armor Professional Knee Brace
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Donjoy Armor Professional Knee Brace

  (1 Review)
Ligament / Leg:  
£499.99   (£416.66 Exc. VAT)  
Availability: In Stock Image
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  • The strongest functional knee brace on the market
  • Perfect for skiing and contact sports
  • Excellent for moderate to severe ACL, PCL, MCL and LCL instabilities
  • Available in a range of sizes suitable for both women and men

Free Delivery - Dispatched by 24 hour courier.

Brand:  Donjoy

Donjoy Armor Professional Knee Brace

Armor by Donjoy is the strongest, off-the-shelf functional knee brace on the market and is designed for active people seeking ligament protection, excellent fit, and superb comfort. The Donjoy Armor Professional Knee Brace by Donjoy is specifically designed for protecting the ACL, MCL, PCL and LCL. The brace can be used for several sporting activities including skiing and is suitable for both males and females.

The Donjoy Armor can be worn by everyone up to the level of professional athletes.  

Knee Zone Support

  • ACL injury
  • MCL injury
  • PCL Injury
  • LCL injury

Suitable Sporting Activities

  • Tennis
  • Ski
  • Motocross
  • Golf
  • Football / soccer
  • Basketball
  • Cycling
  • Volleyball
  • Handball
  • Watersports
  • Other sporting activity

Features and Benefits

  • Patented Four-Points-of-Leverage

  • Flexion-extension control

  • 7 sizes

  • ACL, PCL and Combined Instabilities versions available.

  • Short calf for boot clearance

  • Medial swooping frame.

  • Strong 6061 T6 aircraft aluminum frame

  • 1 year warranty on frame and hinge

  • Standards anti-migration supra Condylar pad

  • Swiveling strap tabs

Which Size Is Right For Me?

For full details on how to size and apply your knee brace, check out our blog.


Size in cm*   Size in inches*


33 - 39cm 13 - 15,5"


39 - 47cm 15.5 - 18.5"


47 - 53cm 18.5 - 21"


53 - 60cm 21 - 23,5"


60 - 67cm 23,5 - 26,5"


67 - 75cm 26.5 - 29.5"


75 - 81cm 29.5 - 32"

*The measurement is taken using the thigh circumference 15 cm / 6 inches above the knee cap.

Donjoy Knee Brace Technology Explained

Donjoy knee braces have a reputation as the ultimate knee supports, providing stability through the Donjoy 4-Points-Of Leverage-System, giving you confidence to ski and run, once again putting your knee through its paces.

Who Are Donjoy and What Makes Their Knee Supports and Braces So Special?

Donjoy are based in California in the USA, and are manufacturers of knee supports and braces such as the Donjoy Armor, Donjoy 4Titude, Donjoy Legend and Donjoy ACL Everyday. The technology Donjoy use to create their braces is constantly evolving to meet the diverse needs of modern sports and activities. The development of a Donjoy brace requires extensive strength, functional and cycle testing of all materials and components.

Donjoy use their Biomechanics Laboratory to develop their braces by using a robotic knee. This was vital in the development of the Donjoy 4-Points-Of-Leverage system. The robotic knee uses pneumatically actuated cables to simulate various states of the human knee providing a testing environment for the different loads and positions a knee may be subjected to. The robotic knee is able to simulate loads that vary from the swing phase of gait, where very little load is going through a joint, up to the massive compressive loads which are forced across a joint when coming of a jump. Donjoy can further manipulate the ACL cable to replicate common sports injuries. The use of the Biomechanics Lab and the robotic knee allow Donjoy to assess how much the tibia moves without a brace and then repeat the testing process with a Donjoy brace to perfect the reduction in tibial translation.

Donjoy 4-Point-Of-Leverage System

Through the 4-Points-of-Leverage rigid cuff and strap configuration, a posterior force is applied to the tibia preventing anterior movement.

The 4-Points-of-Leverage brace design:

  • Significantly reduces ACL strain*
  • Provides a constant dynamic load

Point of Leverage 1 (Point 1)

  • The tibia is anchored by a cuff placed at the bottom of the posterior calf.

Point of Leverage 2 (Point 2)

  • The femur is anchored by a cuff placed at the top of the anterior thigh.

Point of Leverage 3 (Point 3)

  • A strap across the back of the lower thigh pushes the femur anteriorly.

Point of Leverage 4 (Point 4)

  • A strap placed on the anterior tibia applies an active constant load to prevent anterior tibia translation.

*Fleming et all (2000), The influence of functional Knee Bracing on the ACL Strain Biomechanics in Weightbearing and Nonweightbearing Knees, The American Journal of Sports Medicine, Vol. , Nr. 6, p. 815-824

How Donjoy 4-Point Braces Protect The ACL Deficient Knee?

Patients with an ACL deficient knee are having an anterolateral instability that causes “giving way” of the knee.

Trying to “de-rotate” and control instability of the ACL deficient knee in a direct way with a brace is very hard to do.

Therefore the DJO ligament braces try to stabilise the knee in an indirect way through the biomechanical 4-point design.

The 4-point system is clinically proven to be the most effective way to prevent anterior translation of the tibia.

By effectively reducing or preventing (*) anterior translation the 4-point brace in an indirect way avoids or reduces the anterolateral instability (endorotation) in ACL deficient knees and allows the patients to  regain knee stability.

Fourcepoint Hinge Technology (Available on Donjoy Armor With Fourcepoint, Female Fource, 4titude, Legend and ACL Everyday only)

Please note, the Donjoy Armor Professional Knee Brace is not supplied with Fourcepoint hinges. If you require a Donjoy Armor with Fourcepoint hinges, please click here to view the Donjoy Armor With Fourcepoint.

Aggressive eccentric contractions of the quadriceps produce significant anterior tibial translation and can injure the ACL or permanently stretch out an ACL graft (DeMorat et al., AJSM, 2004). Additional studies show quadricep-intensive activities should be avoided at joint angles, particularly the last 30 degrees of extension, when strains are at a maximum. DJO has developed a tool to address maximising ACL and ACL graft protection in these “at risk” positions.

Small knee flexion angles at initial contact during landing tasks may contribute to ACL injuries. The FourcePoint Hinge can be used to control joint range-of-motion by increasing the knee flexion angle during landing to result in a decrease of anterior shear force on the ACL by 9-13% (Garret and Yu, AJSM, 2004).

The DonJoy® FourcePoint utilises a spring mechanism in the hinge to apply gradually increasing resistance during knee extension. The resistance engages in the last 25 degrees of extension (relative to the extension stop).

Three adjustment settings on the hinge allow for varying the amount of resistance to meet the specifications of the physician’s protocols and the patient’s comfort. The hinge may also be turned “off” for no resistance or “on” for resistance.

The resistance serves three critical roles:

  • First, it reduces the time spent near full extension or in the “at risk” position.
  • Second, it increases the posterior load applied by the brace on the tibia to prevent anterior tibial translation.
  • Third, it eliminates the extension shock felt when a patient extends into a 10 degree standard rigid stop.

FourcePoint Hinge Technology works to enhance Donjoy’s Four-Points-of-Leverage design by damping knee joint extension, which improves the mechanical performance of the brace and reduces shear forces at the knee. Addressing the “at-risk” position, the hinge resistance engages in the last 25 degrees of knee extension.

The FourcePoint hinge combined with the Four-Points-of-Leverage cuff and strapping design provides a more comfortable brace that reduces anterior shear forces at the knee. Decreasing anterior shear forces at the knee are beneficial for patients by reducing strain on the healing ACL graft, providing stability to an unstable, ACL deficient knee or for prophylactic use.

Do you have a question about this product or want to purchase it? No problem at all. Simply call us on 020 7720 2266 between 09:00 and 17:00 Monday to Friday. 

You can also email us with your question by using the form below. A member of our helpful Customer Care Team will respond to your enquiry personally as soon as they can.

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Delivery - Free UK Mainland Delivery

This item is usually dispatched by 24 hour courier.

This item is usually dispatched the same day for next working day delivery when ordered before 2.00pm, Monday to Friday.

Please call our Health and Care Customer Care Team on 020 7720 2266 if you have any questions about the delivery of this item.

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Customer Reviews
Average Rating (1 Review):  
Write a Review and share your opinions!

Donjoy Armour
Monday, 22 February 2010  | 

I purchased this item for prophylactic use after having problem with a lateral knee ligament over recent years.Whilst it takes some time to adjust/fit at first, particularly working out the optimum position of the outer pad, it did give me much confidence on my recent ski holiday. I had no problems with my knee and it was there fore well worth the purchase cost.. I would recommend that the brace is used on top of some material covering of the skin.

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