CTi®3 Knee Brace FAQ

Measure your knee width first: straight across the knee at the joint line while standing. That is the main CTi®3 sizing measurement. Then measure around your thigh 8 inches above the center of your kneecap. All CTi®3 sizes are in inches, and the CTi®3 Size Guide has a size finder and a how-to-measure video.

Knee width ranges are Small 3.5"–4", Medium 3.9"–4.5", Large 4.4"–5" and X-Large 4.9"–5.5". Thigh circumference (8" above the kneecap) is Small 15.7"–18.5", Medium 17.7"–21.7", Large 20.5"–24" and X-Large 22.8"–26.4". The full chart, including the distal patella measurement, is on the CTi®3 Size Guide.

The size ranges overlap, so a knee width like 3.9"–4" fits both Small and Medium. When your knee width fits two sizes, use your thigh circumference to decide. If your measurements still point to different sizes, contact us before ordering and we'll help you choose.

Every CTi®3 brace comes with condyle pads in thin, standard and thick, so you can fine-tune the fit at the knee. If the brace feels loose at the knee, fit the thick pads. If it feels tight, fit the thin pads. See Between Sizes? Use the Condyle Pads in the size guide.

Each pad thickness comes as a pair, with one pad stamped A and the other stamped B. Fit one pad of the pair on each side of the brace: A on one side and B on the other. The standard pads come pre-installed.

CTi®3 braces are side-specific, so choose Left for your left knee or Right for your right knee. If you need a brace on both knees, the Motocross Edition Pair and Athlete Edition Pair bundles each include 1 Left and 1 Right brace.

The size you choose for a pair bundle applies to both the left and right brace. If your knees measure different sizes, contact us before ordering or call 877-284-5633 and we'll help.

The CTi®3 is a lightweight, rigid ligament knee brace with a carbon composite frame and a low-profile design. Its Accutrac® hinges are anatomically designed to follow the natural movement of the knee. Adjustable straps and circumferential padding help keep the brace positioned and secure during activity.

The CTi®3 we sell is an off-the-shelf brace, made in four sizes (S, M, L and XL) for the left or right knee. You order it by your measurements rather than a custom mold. Use the CTi®3 Size Guide to find your size.

The CTi®3 is designed to provide functional support for knee conditions involving the ACL, PCL, MCL and LCL. If you are using a brace for an injury, rehabilitation or another medical condition, consult your doctor or orthotist about whether it's right for you and how to use it.

No knee brace can guarantee protection against injury. The CTi®3 is designed to support the knee during activity, not to replace medical advice. Talk to your doctor or orthotist about your knee and how a brace fits into your care.

The CTi®3 is popular with motocross and off-road riders. Our Motocross Edition Single and Motocross Edition Pair bundles add the CTi®3 Impact Guard, which covers the front of the knee, plus a Sleeve with Mesh for each brace. Read our motocross knee brace page for more.

Riders and athletes use the CTi®3 for BMX, snow sports, surfing and wakeboarding and pickleball, as well as motocross. Each sport page explains which setup fits that activity.

Yes. The CTI Shop is an authorized CTi®3 retailer, and every CTi®3 brace we sell is a genuine Össur product. Eligible products carry the manufacturer's warranty; see our Warranty page.

Eligible CTi®3 braces are covered by the Össur manufacturer warranty against defects in materials and workmanship: 2 years on the frame and hinges, and 6 months on soft goods, liners, straps and pads. Coverage applies to the original purchaser and excludes misuse, modification and normal wear. Details and how to start a claim are on our Warranty page.

Every CTi®3 brace includes a Condyle Pad Set (thin, standard and thick, each a stamped A/B pair) and an Extension Stop Set (0° pre-installed, plus 5°, 10°, 20° and 30°). Pair bundles include 2 of each set, one with each brace.

• CTi®3 Single Knee Brace: one brace, left or right.
• Motocross Edition Single: one brace plus an Impact Guard, Sleeve with Mesh, decal sheet and product bag.
• Motocross Edition Pair: a left and right brace, 2 Impact Guards, 2 Sleeves with Mesh, a decal sheet and a product bag.
• Athlete Edition Pair: a left and right brace, 2 Coolmax undersleeves and 2 neoprene oversleeves.

Extension stops fit into the CTi®3 hinge and limit how far the knee can straighten. The 0° stop comes pre-installed, and the 5°, 10°, 20° and 30° stops are included. They are not a sizing tool, so change them only as advised by your doctor or orthotist. More on extension stops.

Yes. The CTi®3 MX (Motocross) Kit adds an Impact Guard with installation hardware, a Sleeve with Mesh, a decal sheet and a product bag to a CTi®3 brace you already have. The CTi®3 Impact Guard is also sold on its own in Left or Right, sizes S–M and L–XL.

Yes. We stock condyle pads, extension stops, liners, straps, D-rings, hook sets, guard parts and more. Browse them all in Replacement Parts & Accessories, and choose the size and side that match your brace where asked.

That depends on your pants, boots and brace size. If you're unsure, contact us with details of your gear before you order.

Remove the liners and pads, then wipe or rinse the frame, hinges and straps with cool water, avoiding high-pressure hoses. Hand-wash the liners in cool water with mild soap and squeeze out the water without wringing. Let everything air-dry completely, away from direct heat. Full steps are in our CTi®3 Care & Maintenance guide.

Our care guide suggests replacing condyle pads every 6–12 months, depending on use. Replace them sooner if they're compressed, torn or no longer cushion well. Replacement CTi®3 condyle pads are available.

Yes. We ship within the United States only, and standard ground shipping is free on all CTi®3 braces and accessories. Delivery typically takes 3–5 business days once your order ships. Need it faster? Contact us before ordering to ask about expedited options. See our Shipping Policy.

Eligible CTi®3 braces can be returned within 30 days if they are new, unused and complete with all parts and original packaging. A 15% restocking fee may apply if the product isn't returned in its original packaging, and return shipping is paid by the customer. Contact us for return instructions before sending anything back. Read the full Return & Refund Policy.

We don't offer direct exchanges. If you need a different size or side, return the eligible original item under our Return & Refund Policy and place a new order for the correct one.

Yes, HSA/FSA payment is available on our store. Plan rules vary, so check with your HSA or FSA administrator if you're unsure whether your purchase qualifies.

Yes, payment plans are available. The plan terms are shown at checkout before you confirm, so review them before you choose a plan.