A22 Custom Knee Brace

A22 w/o sleeve
A22 w/sleeve
A22 w/o sleeve
A22 w/sleeve

A22® Custom Knee Brace

Knee Protection Program Knee Protection Program

Confidence starts with one number

Uncompromised engineering delivers the world’s first titanium brace striking the perfect balance of weight, strength and profile.

Learn the facts about bracing for ACL treatment and prevention.

Ordering Information

Support Guide


Your options for managing your ACL injury depend on several factors, including how severe the injury is and your lifestyle. Read More...

  • Overview
  • Videos
  • Part Numbers
  • Accessories
  • Documents
  • References
  • Testimonials


Uncompromised engineering helps deliver the world’s first titanium brace striking a balance of weight, strength and profile.


Accelerated Comfort

Cushioning cells help absorb shock, while aiding stability and proper fit.

Environmental Protection

Anti-microbial coating helps neutralize odor while helping to increase comfort and soft goods longevity.

Freedom to Perform

Aerodynamic integration of liners helps reduce overall profile which which aids in facilitating comfort, speed and cadence.


Four points of leverage™

The rigid anterior thigh and posterior calf cuffs combined with a specific strapping sequence, provide four-points-of-leverage shown to help decrease ACL strain by at least 50%.1,3

  1. Anterior thigh anchor
  2. Posterior tibia anchor
  3. Lower thigh strap helps push femur anteriorly
  4. Anterior tibia strap applies an active constant load to help prevent anterior tibial translation

Fourcepoint™ hinge

Resistance engages in the last 25° of extension helping to keep the knee out of the at-risk position.


Decreases peak posterior ground reaction force (PPGRF) during stop jump task landing and side cutting activities2

Increased flexion angles14

No significant performance limitations were associated with knee bracing with FourcePoint hinge technology2

Training effects retained by about 50% while not wearing the brace (when training with FourcePoint hinge technology)15

protection to perform

DonJoy® ligament knee braces have been shown to help IMPROVE JOINT MECHANICS and SYMMETRY between both knees and up to a 60% DECREASE in non-contact ACL injury rate in both knees.10

  • A person who has torn their ACL has 15X greater risk of a 2nd ACL injury (during initial 12-months after ACL reconstruction)8
  • 50% of all ACL injuries occur in 15 to 25 year olds9
  • In all sports Women are 2 to 10X more likely to injure their ACL6
  • Bracing helps reduce ACL Re-injury by 3x while skiing 7
  • Non-contact sports account for 60%–80% of ACL injuries 10
  • ACL injury to the contralateral knee risk is 2X that of the reconstructed knee. (all sports)11

If a patient re-ruptures a reconstructed ACL while wearing a properly fitted DonJoy A22® , Defiance® , Armor FourcePoint™ or FULLFORCE™ within one year of purchase, DJO Global® will pay a surgical insurance deductible.


A22 Custom Knee Brace - Reinventing Confidence


A22 - How to Apply


A22 - Product Overview


DonJoy Custom Knee Brace Measurement Guide


DonJoy Functional Knee Brace Fitting Guide


Why PFATS Trusts DonJoy


DJO’s Impact on Football


DonJoy Custom Bracing Revolutionizes the Game


DJO's Partnership with PFATS

Ordering Information

Measurements taken with CCMI Mark III.

Size Thigh Calf
Minimum 15 1/2” 12”
Maximum 29” 19 1/2
A22 Sleeve Sizing
x-2 = S  15 1/2” - 18 1/2”  (39 - 47 cm)
x-3 = M  18 1/2” - 21”  (47 - 53 cm)
x-4 = L  21” - 23 1/2”  (53 - 60 cm)
x-5 = XL  23 1/2” - 26”  (59.5 - 67.25 cm)
x-6 = XXL  26 1/2” - 29 1/2”  (67.25 - 75 cm)
Accessories Description Size
25-5265 A22 Gel Condyle Pads (pair) Universal
25-5261-x-06000 A22 Suspension Sleeve S-L
11-0075-x-00000 Lycra Suspension Sleeve S-XXL
11-0122-x Neoprene Suspension Sleeve XS-XXL
  1. Beynnon BD, Pope MH, Wertheimer CM, Johnson RJ, Fleming BC, Nichols CE, Howe JG, Journal of Bone & Joint Surgery, Am. 1992; 74:1298-1312.
  2. Lin CH, Liu H, Garrett WE, Yu B. Effects of Knee Extension Constraint Brace on Selected Lower Extremity Motion Patterns During a Stop-Jump Task. Journal of Applied Biomechanics.2008;4:158-165.
  3. Beynnon BD, Johnson RJ, Fleming BC, Peura G, Renstrom PA, Nichols CE. The Effect of Functional Knee Bracing on the Anterior Cruciate Ligament in the Weightbearing and Nonweightbearing Knee. American Journal of Sports Medicine. 1997; 25(3):353-360.
  4. Birmingham T, Bryant D, Giffin J, Litchfield R, Kramer J, Donner A, Fowler P. A Randomized Controlled Trial Comparing the Effectiveness of Functional Knee Brace and Neoprene Sleeve Use After Anterior Cruciate. American Journal of Sports Medicine. 2008, 36:4. 648-655 Ligament Reconstruction
  5. Robert Butler, PT, DPT, PhD, Boyi Dai, PhD, William Garrett, MD, PhD, and Robin M. Queen, PhD. Changes in Landing Mechanics in Patients Following Anterior Cruciate Ligament Reconstruction When Wearing an Extension Constraint Knee Brace. Sports Health Online, February 26, 2014.
  6. Silvers HJ, Mandelbaum BR. Prevention of Anterior Cruciate Ligament Injury in the Female Athlete. Br J Sports ed. 2007; 41 (suppl):i52-i59
  7. Sterett WI, Briggs KK, Farley T, Steadman JR. Effect of Functional Bracing on Knee Injury in Skiers with Anterior Cruciate Ligament Reconstruction: A Prospective Cohort Study. 2006: 34:1581-1585.
  8. Paterno MV. Paper #2. Presented AOSSM Annual Meeting; July 11-14, 2013; Chicago.
  9. --Griffn LY, Albohm MJ, Arendt, EA, et al. Understanding and Preventing Noncontact Anterior Cruciate Ligament Injuries: A Review of the Hunt Valley II Meeting, January 2005. American Journal of Sports Medicine. 2006 34:9. 1512-1532.
  10. Arendt EA, Agel J, Dick R. Anterior cruciate ligament injury patterns among collegiate men and women. Journal of Athletic Training, 1999; 34(2):86-92.
  11. Wright RW, Magnussen RA, Dunn WR, Spindler KP, Ipsilateral Graft and Contralateral ACL Rupture at Five Years or More Following ACL Reconstruction. Journal of Bone and Joint Surgery, Am. 2011; 93:1159-1165.
  12. Spindler et al. Return to High School and College-Level Football After Anterior Cruciate Ligament Reconstruction. Am J Sports Med. Published online Aug. 24, 2012.
  13. Queen R, Butler RJ, Dai B, Garrett WE. Effects of Knee Extension Constraint Bracing on Lower Extremity Motion Patterns in Post-ACL Reconstruction Patients. Interium Report of 6-12 month data from the ongoing study, 2012.
  14. Yu B, Herman D, Preston J, Lu W, Kirkendall DT, Garrett WE. Immediate Effects of a Knee Brace with a Constraint to Knee Extension on Knee Kinematics and Ground Reaction Forces in a Stop-Jump Task. AJSM. 2004; 32:1136-1143.
  15. Yu B. Training Effects of Knee Extension Constraint Brace on Lower Extremity Motion Patterns and the Risk for Non-Contact ACL Injury. Feagin Leadership Forum. Duke Sports Medicine Center, 2010.
  16. Hui Liu, PhD, Will Yu, PhD, Wanxiang Yao, PhD, Jeffrey T. Spang, MD, R. Alexander Creighton, MD, William Garrett, MD, PhD, and Bing Yu, PhD. Effects of Knee Extension Constraint Training on Knee Flexion Angle and Peak Impact Ground-Reaction Force. AJSM PreView. February 14, 2014.

“I was devastated when I tore my ACL last Winter playing basketball. I underwent surgery in mid March 2016 and then started the long 6 month rehab. My true love is softball and my high school season started before I was released, but with the help of my athletic trainer and the titanium brace I was able to slip right back into my starting catcher position on our varsity team. I was honored to be chosen for first team all districts and all region post season. We ended the season in the Quarterfinals. Thanks to my DonJoy brace I was able to go right back to what I love.”

~ Emily Fair

“I began my journey with DJO Global with the Defiance brace. The Defiance brace brought me strength, confidence and support. I was wearing the Defiance brace to help me recover from ACL and meniscus repair surgery. With the Defiance brace I felt I could run father, harder and with more confidence.While visiting DJO Global, I was introduced to the A22. The A22 is just what I needed. Like the Defiance brace, the A22 offers support, strength and confidence, but with a great deal less weight and bulkiness. Though the A22 is slimmer, you do not lose any strength or stability. I honestly forget I am wearing the A22 as I run or go through a major workout session. As I continue on my journey to be the best I can be, the A22 will definitely help me reach that destination." ”

~ Jennifer Foley