X3: The world's most technologically advanced prosthetic leg
Above-Knee Prosthesis with: X3
The result of a collaboration between the US military and Ottobock, the X3 is quite simply the world’s most technologically advanced microprocessor prosthetic leg.
You may have a challenging or adventurous lifestyle. Or, you may simply want to keep up with everyday activities (showering, hiking, running to catch a bus) without having to worry if your prosthesis can make it through.
Click on the red “hot spots” in the photo to dig deeper into the advanced technology that will increase your mobility and your peace of mind.
Go to the Advantages for You tab below to learn how the X3 can transform the way you walk.
Convenient, more powerful battery = more peace of mind.
With a battery life of 5 days, you can stay an extra day or two away from home with no worries. Plus, X3’s charger is connected with magnets to the back of the knee. Makes charging a snap — even through clothing or cosmetic covers – and no open charging ports.
A reliable, responsive foundation.
Choose one of the two waterproof Triton feet from Ottobock to complete your X3 system: the Triton Heavy Duty (for particularly challenging conditions), or the Triton Low Profile (with especially low structural height for those who need the extra room). For non-waterproof support, use any of the Triton family of feet. See the Components tab on this page for more information.
The X3 has additional sensors integrated in the tube adapter. From the moment your heel strikes the ground until your toe lifts off, the sensors tell the microprocessor exactly where you are in your walking cycle, as well as measure the amount of force acting on the knee. The sensor data help make the most natural movement possible for you.
The X3 protective cover is lightweight and incredibly strong. Designed for military members returning to active duty, it’s ready to stand up to the demands of your life.
The X3’s gyroscope and acceleration sensor measure the acceleration and position of the X3 in space. The angle sensor determines the angle and speed of your knee joint. The software considers the data being gathered from its sensors in real time. All this means that X3 can determine in real time the resistance (support) you need from your leg, depending on where you are in your walking cycle or whether you’re going up or down steps or an incline.
To ensure a secure, comfortable fit, your socket will be created to uniquely fit your limb. The fit of the socket is so important that people can have trouble walking with the prosthesis – all because of a socket fit problem! To prevent that, you should work with your prosthetist to make sure your socket fits perfectly. Learn more about sockets and liners at Lower limb prosthetics 101.
Water? Dirt? No worries.
The X3’s corrosion resistant materials (titanium, hard anodized aluminum, stainless steel, and coating) make this leg waterproof and nearly impenetrable by dust or dirt.
What you need to know
Advantages for you
The most natural gait possible
An accelerometer and a gyroscope intuitively know where your leg is in space, using the same technologies from Wii™ gaming systems and smartphones, for a virtually natural gait. That means less worry of a stumble or fall and less concentration needed when you’re on the move.
More physical capabilities than any other prosthetic leg including running, walking backwards, crossing obstacles in a more anatomically correct way, and climbing stairs step-over-step without massive compensating movement. You’re always in control.
The X3 has undergone stringent waterproof testing. Completely submersible, the X3 allows unprecedented contact with water. Perfect for anyone working near water or for activities such as showering, washing your car, or boating. (Just be sure to clean it afterwards.)
We've added a simple "Assurance" cover (right) as a contrast to the original "Xtreme" cover (left). Ask your practitioner which is best for you. With either choice, you get the ultimate in rugged, waterproof performance. Both covers can be purchased separately, as an accessory.
Running on the X3 prosthetic leg.
Via the remote, the X3 switches into a larger swing angle for running and other sports. Plus, the innovative Walk2Run mode detects start-and-stop running (such as crossing a street or trying to catch a bus) and automatically increases your swing angle.
Robust and ready
The X3 is “ruggedized” based on conditions an active duty military member might face. That means it’s up to any challenging terrain you may encounter!
Keep going for longer
X3 offers improved battery life and an automatic “sleep” mode. That translates into five plus days of use without the need for a recharge, giving you greater independence.
Every step is smooth and secure
Choose any of the Triton feet from Ottobock to complete your X3 system -- these two are waterproof:
- the Triton Heavy Duty, robust and waterproof, for particularly challenging conditions), or
- the Triton Low Profile, with especially low structural height for those who need the extra room
5 activity modes
Five activity modes allow your choice of activities –biking, golfing, driving, and more – activated using a key fob-sized remote. Just strap on the remote control via its Velcro wristband – you’re ready to go!
How the X3 works
The X3 advantage: Optimized Physiological Gait (OPG)
How does it work?
The X3 maintains a hydraulically controlled 4˚ of preflexion of the knee joint when your heel starts your stride (“heel strike”), which allows your foot to reach full contact more quickly and gives you a more stable start to your step.
(2) Adaptive Yielding Control
Intelligent knee flexion (max. 17˚, depending on the situation) gives you more efficient, intuitive control of your prosthesis.
- Because the knee is flexed it better absorbs shocks and helps limit future orthopedic problems.
- Easy to take off with a quick step or side step.
- Makes slopes and uneven terrain easier to handle, while reducing the need for you to make compensating movements.
(3) Dynamic Stability Control (DSC)
The heart of the system: DSC continuously samples multiple environmental inputs—including a gyroscope and 2-axis accelerometer—which determine the appropriate resistance (support) and release at any time during your walking cycle. That means optimum security for you.
- Supports multi‑directional movement, so you can take quick steps— forwards, backwards, and sideways.
- Increases stability when walking backwards.
(4) Adaptive Swing Phase Control
You get precise control of your lower leg no matter what your walking speed is. This also helps to prevent falls.
- The quality of your swing phase (when your leg is off the ground) is far superior to other prosthetic knee joints.
- It’s easier to swing your knee through during a stride, helping reduce the risk of stumbles and falls.
- There are no limits on walking style: quick, slow, irregular— X3 handles it all.
The waterproof Triton Low Profile, with especially low structural height for those who need the extra room
The waterproof Triton Heavy Duty, robust and ready for particularly challenging conditions
The lightweight Triton carbon fiber foot with exceptionally smooth control
The Triton Vertical Shock (VS) with great shock absorption in a compact design
The Triton Harmony with integrated vacuum technology
|Patient weight||275 lbs|
|Weight of knee||3 lbs 12 oz|
|Weight of the tube adapter||10.5 oz|
|Adjustable activity modes||5|
|Operating with fully charged battery||Approx. 5 days|
|Knee flexion angle||Max. 135 degrees|
Take a look at our Frequently Asked Questions for more information.
Your conversations and goal setting with your prosthetist will drive the decision about which system will best support your activities. If you don’t have a prosthetist you see regularly, look here for a local Qualified Prosthetist.
Except for certain products available at www.mobilitydirect.com, patients cannot purchase products directly from Ottobock. Ottobock products are generally prescribed by physicians or clinicians, who provide the product to the patient.
If you’d like to be fit with an Ottobock product, please talk to your physician or clinician (orthotist, prosthetist, therapist, or Rehab Technology Specialist).
If you have further questions, please call 800 328 4058 and ask for our Consumer Support Specialist.
You and your prosthetist will put together the system that’s right for you. Look in the Components tab on this page to see the options.
There are many ways to cover the cost of your prosthetic leg system. Check out the Financial Coverage section of this website.
See the Technical Info tab on this page.
See the Components tab on this page for info on recommended feet for this system.
Not finding what you are looking for? Please contact us!