Experience the Evolution.

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Experience the Evolution

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THE NEXT GENERATION

Not just an upgrade.

Next-level features, designed for you.

This is the most advanced microprocessor knee PROTEOR has ever built, engineered for people who don't have time to think about their knee.

QUATTRO 2 doesn't just sense your movement…it adapts in real time. Everything that made the original legendary—now stronger, smarter, and more capable, with movement possibilities unique to QUATTRO 2. A reinforced frame. A more powerful processor.

WHAT'S NEW WITH QUATTRO 2

Stair Ascent Functionality

Natural, intuitive stair climbing powered by a faster processor and reinforced frame.

10× Faster Microprocessor

A faster, more powerful processor means the QUATTRO 2 responds to your movement in real time, so you can focus on living, not thinking about your knee.

330lb/150kg Weight Limit

A stronger frame expands access
to more patients than ever.

IP68 Water Rating

Rain, puddles, the shower—live your life without thinking twice.

USB-C Power OPTIONAL

2–3 day battery, one cable, no fuss

Stronger Frame

Engineered for higher weight capacity and long-term durability.

Fluent in Movement.
By design.

At its core, QUATTRO 2 is built around three commitments: MOTION, ADAPTABILITY and PROOF.

Effortlessly Smooth Movement

A patented single bidirectional valve delivers infinite resistance settings with ultra-responsive speed. Three high-precision sensors drive real-time adaptive adjustments. The result: smooth, natural, optimized movement.

Patented Valve + Sensory

Seamless Adaptability

At just 21.6 cm (8.5 in), QUATTRO 2 is the shortest MPK on the market, expanding compatibility with the widest range of feet, ankles, and running blades. With up to 20 pre-set activities, independent stair ascent, stair descent, and ramp resistance, it adapts to whatever your day demands. And with remote firmware updates, your knee stays current—always.

20 Programable Modes

Proven by Data

In a multicenter, randomized cross-over trial, QUATTRO significantly improved daily life activities compared to the typically worn MPK. Subjects also reported fewer physical limitations with QUATTRO.

Multicenter RCT

3 CORE PROMISES

THE SCIENCE BEHIND IT

Three sensors.
One valve.
Zero hesitation.

QUATTRO 2's patented single bi-directional valve continuously modulates resistance with ultra-responsive speed. Three high-precision sensors — running at the highest sensitivity and sampling rates in the category — read your biomechanics in real time, making every transition feel truly intuitive. The result: a knee that moves the way you think, not the way you tell it to.

Patented Bi-Directional Valve

3 High-Precision Sensors

Backwards Walking Detection

Stair Ascent

Remote Firmware Updates

Enhanced PCBA

CLINICAL EVIDENCE

The data backs every claim.

In a multicenter, randomized cross-over trial — QUATTRO was compared head-to-head against each subject's currently worn MPK across real-world daily activities.

Significantly improved daily life activities

4/4

USERS IMPROVED

Walking on uneven terrain with obstacles

2/2

USERS IMPROVED

Walking backwards

Subjects improved across 11 activities including walking backwards, uneven terrain, water activities, stairs descent, and more.

Significantly fewer physical limitations

Subjects reported far fewer physical limitations with QUATTRO than with their currently worn MPK — a meaningful quality of life gain.

3/3

USERS IMPROVED

Walking downhill

4/6

USERS IMPROVED

Water activities

Scored higher on appearance

Subjects rated QUATTRO's appearance significantly higher than their typically worn MPK — because how it looks matters too.

*RCT, n=17, France, 2023–2024. Protocol approved by national ethics committee (Protocol ID-RCB 2022-A01266-37).

PSFS SCORE IMPROVEMENTS — QUATTRO VS. CURRENTLY WORN MPK

REAL LIFE. REAL CAPABILITIES

Human First.
Living Proof.

Shaped by real people and real experiences. QUATTRO 2 was designed with you in mind—built to fit your life and your needs. A connected app puts you at the center of it all, with effortless integration and intuitive controls. When you put people first, innovation follows.