X3: Reclaim your adventure

The world’s most technologically advanced microprocessor knee

X3  Microprocessor Knee.

X3: uniquely intelligent, ready for anything


X3 is the result of a collaboration between the US military and Ottobock. The goal was to design a prosthesis that was intelligent, durable and rugged enough to enable service members with above knee amputations to return to active duty. X3 achieved that goal and more. From our military’s finest to the adventure-seeker and athlete, X3 delivers the most intuitive and dynamic control available in microprocessor knee technology. 


Waterproof! The X3 has undergone stringent waterproof testing. Completely submersible, the X3 allows unprecedented contact with water including showering, swimming, boating, fishing and more. Ideal for patients working in or near water!

Run, walk, run Via the remote or new Cockpit app for Android, the X3 can switch into a larger swing phase angle suited for running and other sports. In addition, the innovative Walk2Run mode is ideal for running short distances and start-and-stop running such as across a street, down the hall or to catch a bus. In that mode, the X3 detects a walk-to-run transition and the swing angle automatically increases, with no preflexion.

Robust and read The rugged design of X3 is based on conditions an active duty service member might face. As a result, X3 can withstand the elements – from rough and tough terrain to diving into water.

The most natural gait possible The X3 features Inertial Motion Unit control, a patented technology from Ottobock that enables the prosthesis to identify where a user’s leg is in space. This feature, coupled with Optimized Physiological Gait technology, enables the user to walk with the most natural gait possible, step backwards with confidence, tackle stairs, slopes and uneven terrain and worry less about stumbling or falling.

Real-world mobility  More physical capabilities for the real world 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 movements – ­an action that previously appeared impossible for those with above knee limb loss.

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 and results in greater independence.

5 activity modes Programmed using a laptop and integrated Bluetooth technology, five activity modes can be set for biking, golfing, driving and more. They are activated using the new Cockpit app for Android or the remote.

Add an Ottobock foot Recommended waterproof feet are the 1C63 Triton Low Profile  and the 1C64 Triton Heavy Duty. Other approved feet include 1C60, 1C61, and 1C62 Tritons; the 1E56 Axtion; the 1E57 LoRider®; the 1C30 Trias and 1C31 Trias+; 1C40 C-Walk®; and the 1D35 Dynamic Motion.

The X3 carries a 3-year standard warranty with free service inspections at the 12th and 24th months.

Reimbursement support

Please call the Reimbursement Hotline if you have questions at 800 377 0338.

   X3 Specifications

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
 Moisture protection Rated IP68

X3 Proctective Covers

We've added a simple 4X900 "Assurance" cover as a contrast to the original 4X193-1 "Xtreme" cover. Your patient simply picks their favorite. Download more details and an order form in the document list below.

X3 prosthetic leg system.
Fishing using the X3 prosthetic leg.
Biking with the X3 prosthetic leg.
X3 waterproof prosthetic leg.
Andrew rides his jetski wearing the X3 waterproof prosthetic leg.

    Cooperative Care clinical consulting service

Order form / Downloads / Links

TITLE / DESCRIPTION Download / link

X3 specification sheet

Download (PDF | 876.0 KB)

X3 Order Form - US

Download (PDF | 204.4 KB)

X3 Protective Covers Flyer

Download (PDF | 175.0 KB)

Watch the X3 video with Andrew Lourake


Get trained to fit Ottobock MPKs.  Note: For Genium/X2 trained practitioners no further training required.


Find a Practitioner

Find a Practitioner.
Locate a certified practitioner near you
Find a Practitioner.


Suggested L-codes, PDAC, reimbursement guides, clinical studies, and more.
Quality for life