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The RHEO KNEE XC is a microprocessor-controlled knee designed to support patients from early rehabilitation to full recovery with its effortless, intuitive, and stable functionality. It builds on reliable and clinically proven technology, delivering outstanding user outcome.

Key Features

  • Supports rehabilitation and increased mobility; including cycling, walk-to-run, and stair ascent.
  • Auto adaptive real-time stance and swing control.
  • Dependable and easy swing initiation on all surfaces.
  • Automatic stumble recovery.
  • Manual extension lock.
  • Weatherproof design allows exposure to fresh water splashes.
  • Accompanying Össur Logic app for iOS devices provides:
    • Simple practitioner setup and adjustment, and printable user activity reports.
    • Functional training exercises for improved user confidence.
    • Selection of user preferences and monitoring of step count and battery charge level.
  • Smart Extension makes raising from a squatted position easier with less resistance.
  • Facilitates stepping over obstacles and stepping backwards.

Impact Levels

Impact LevelExample


Daily activities involving gentle, steady walking with the use of a walking aid.

Example: Moving around at home, modest walking in the community.


Daily activities involving average walking with the ability to vary speed or walking pattern.

Example: Going to the shops, confident outdoor walking.


Daily activities involving fast walking, jogging and climbing stairs.

Example: Heavy-lifting, manual labor, recreational sports.

More Dynamic Solutions


RHEO KNEE and RHEO KNEE XC come with ÖSSUR LOGIC software, which enables professionals to adjust easily the functionality for each user and access valuable activity reports.

In addition to checking knee status and battery charge level, the new, enhanced user mode offers access to a specially designed training program. The Össur Logic Training feature enables Clinicians to empower users with easy exercises to practice at home and at their own pace, improving confidence and gait. Exercise include symmetric weight bearing, rolling over the toe, more symmetric sitting down and stair descent.

Software is available for iOS devices (iOS 9.3 or later), and communicates wirelessly via Bluetooth.

Expert Mode*

  • Knee setup: facilitates automatic and manual adjustments, monitors knee angle and load.
  • Enhanced Stability Control options: provides transitional settings for first steps.
  • Activity reports: records step count, walking speed distribution, average walking speed (PDF format available).

*License code is required for expert mode.

User Mode

  • Training: functional training exercise program
  • Monitor remaining battery charge and step count
  • Instructions-for-use
  • Adjust sounds and vibration
  • Turn extension hold on/off

Össur Logic App on the App Store

The Össur Logic App is available free of charge on the App Store.

Expert mode is only available for the healthcare professional with training from Össur.

NOTE: Össur Logic cannot be used with older versions of RHEO KNEE as those models do not include the Bluetooth Low Energy hardware required to communicate with iOS devices.

RHEO KNEE XC Specifications

RHEO KNEE® XC Product Information
Amputation Level:


Knee Disarticulation

Impact Level: Low to High
Weight Of Knee: 1.61kg (3.56lbs)
Build Height: 236mm (9 1/4")
Knee Flexion: 120º
Aluminum Frame Construction: Yes
Max Patient Weight: 136 kg / 300 lbs - (Impact Level: Low - Moderate)
100 kg / 243 lbs - (Impact Level: High)


Kit Includes: RHEO KNEE XC, RHEO KNEE Power Supply w/Plug, Terms of Warranty, Instructions for use.
RKNXC0003 3 Years Warranty (No Service Check)
RKNXC0005 5 Years Warranty (Incl. Service Check at 40 Months)

RHEO KNEE XC with Threaded Top Adapter

RHEO KNEE XC with threaded top adapter is the solution for knee disarticulation amputees and those with long residual limbs.

To order RHEO KNEE XC with threaded top adapter, order the RHEO KNEE XC Kit and add Össur's Female Pyramid Insert to the order.

Female Pyramid Insert
A-145310 Female Pyramid Insert / Threaded Top Adapter 9mm (3/8") 33g (1.16oz)
RHEO KNEE XC Accessories
N/A ÖSSUR LOGIC for iOS devices is available on the App Store
BIC00110 Bionic Protector for RHEO KNEE
PRX00421 Power Supply w/Plug
RHEO KNEE XC Kit Extended Warranty*
* Maximum total warranty period is 5 years, must be purchased within 12 months after original purchase date.
RKNXCGE2YR Additional 2 Year Warranty (Incl. Service Check at 40 Months
RKNXCSC20M Voluntary 20 Month Service Check
RKNSCAW Voluntary After Warranty Service Check
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