DonJoy Hinged Air Knee Brace for Hyperextension and Patellar Support
The DonJoy Hinged Air Knee Brace combines medial/lateral hinged support with inflatable pads that can help stabilize the kneecap. Enovis lists hyperextension, patellar tendonitis, chondromalacia, and medial/lateral knee instability among its applications. The breathable Drytex construction has a wraparound rear thigh panel, a sleeve-style calf section, and a popliteal cutout behind the knee.
Which version do I order? All six size choices are the same DonJoy Hinged Air model, in black, and are designed to fit either the left or right knee. Select one size (XS–XXL) using the chart below. Each quantity is one knee brace, not a pair.
Why Choose the DonJoy Hinged Air?
- Hyperextension support: Polycentric hinges with extension control; the manufacturer's instructions identify a 10-degree extension stop installed in the brace.
- Adjustable kneecap support: Inflatable medial and lateral air chambers allow targeted patellar buttress support.
- Side-to-side stability: Bilateral hinges provide medial/lateral support for appropriate knee instability.
- Breathable fit: Drytex is a breathable alternative to neoprene; upper and lower support straps help secure the brace.
- Easier application: The rear thigh wrap panel opens while the calf portion slips over the foot.
How to Order the Correct Size
Use a flexible tape measure with the leg slightly bent. Take three circumference measurements: 6 inches above the center of the kneecap (thigh), at the center of the kneecap, and 6 inches below the center of the kneecap (calf). Compare all three values with the manufacturer's measurements. Measurements are displayed in inches first.
| Order Size | Thigh (6" above) | Knee Center | Calf (6" below) | Manufacturer Part Number |
|---|---|---|---|---|
| XS | 13–15.5" | 12–13" | 10–12" | 11-0855-1-06000 |
| S | 15.5–18.5" | 13–14" | 12–14" | 11-0855-2-06000 |
| M | 18.5–21" | 14–15" | 14–16" | 11-0855-3-06000 |
| L | 21–23.5" | 15–17" | 16–18" | 11-0855-4-06000 |
| XL | 23.5–26.5" | 17–19" | 18–20" | 11-0855-5-06000 |
| XXL | 26.5–29.5" | 19–21" | 20–22" | 11-0855-6-06000 |
Only sizes XS–XXL are offered for this particular Hinged Air model. Please use the size selector next to the product price to choose the exact size before adding to cart. You do not need to select a separate left/right version.
Manufacturer Video: How to Measure for a DonJoy Knee Brace
This official Enovis DonJoy video explains the three-point leg measurement method. It is a sizing demonstration, not a Hinged Air-specific fitting video.
Watch the official sizing video on YouTube
How to Put On and Adjust the Brace
- Sit at the edge of a chair, open the rear brace panel and step your leg through the brace.
- Slide it into position so the top of the circular opening aligns with the top of the kneecap; keep the two hinges parallel.
- Close the rear panel comfortably and secure the thigh and calf straps.
- Inflate the relevant medial or lateral air chamber with its built-in pump as instructed by your healthcare professional. Use the release valve when a reduction in air pressure is needed.
- Check fit and comfort. Any change to the extension-stop setting should follow your clinician's directions; both hinge stops must match.
Read the DonJoy Hinged Air official fitting and care instructions (PDF). The guide includes actual product illustrations for fitting, inflation and hinge adjustment.
Extension-stop note: The standard brace has a 10-degree extension stop already fitted. Other stop settings and optional replacement parts should not be assumed to be included with your purchase. Confirm any prescribed settings and required accessories before use.
Specifications and What's Included
- Brand/manufacturer: DonJoy by Enovis / DJO, LLC
- Product model: Hinged Air, Drytex series 11-0855-x-06000
- Available sizes: XS, S, M, L, XL, XXL
- Laterality: Universal; fits right or left knee
- Design: Bilateral polycentric hinges, inflatable patellar support, rear wraparound thigh, slip-on calf, popliteal cutout
- Color: Black
- Unit of measure: One brace (each); no separate left/right selection
Common Questions
Is the DonJoy Hinged Air designed for knee hyperextension?
Yes. Enovis lists hyperextension as an intended application and describes hinges that offer flexion/extension control. It does not guarantee prevention of injury; brace suitability and extension-stop settings depend on your clinical needs.
Can this brace be used on either knee?
Yes. The 11-0855-x-06000 model is universal for the left or right knee; choose by size only.
How many braces do I receive?
Each order quantity contains one DonJoy Hinged Air knee brace in your selected size, not a pair. Additional stop kits or accessories are not represented as included.
What is the difference between Hinged Air and DeRoyal Hypercontrol?
Both are intended to provide support where hyperextension is a concern. Hinged Air additionally offers adjustable pneumatic patellar buttresses and a standard 10-degree extension stop. The DeRoyal Hypercontrol uses a different strapping-based hyperextension-control design. Follow your clinician's recommendation.
Is this a post-operative immobilizer?
No. It is a semi-rigid hinged knee support. If your clinician prescribes a particular post-operative range-of-motion or immobilization protocol, review a suitable post-operative ROM brace instead.
Related Collections
- Knee Hyperextension Braces — products intended to help limit excess knee extension
- Knee Ligament Tear / Sprain — functional and post-injury knee supports
- Knee Braces — browse the full knee support assortment
Manufacturer sources: Enovis product information and DonJoy sizing details.
Medical equipment should be selected and fitted in accordance with guidance from a qualified healthcare professional. Manufacturer fulfillment may involve additional processing time. Expedited shipping refers to carrier transit after pickup and does not guarantee a particular arrival date. Review OrthoTape's return policy before ordering.