Ossur Navii Knee: Full Review, Features, Specs, and Who It’s For

Ossur Navii Knee prosthetic leg advanced mobility

If you’re researching the best microprocessor knees, the Össur Navii Knee is one of the newest and most advanced options available. Engineered with IP68 waterproofing, AI-driven motion detection, and a lightweight design, the Navii Knee is built to provide confidence, stability, and freedom in everyday life.

In this review, we’ll break down how the Ossur Navii Knee works, its key features, ideal users, warranty, durability, and what makes it different from other microprocessor knees on the market.

If you’re starting your research into microprocessor knees, you may want to check out our earlier reviews on the Ottobock C-Leg 4 and Össur Rheo Knee XC to see how the Navii compares to other trusted MPKs.

Table of Contents

  1. What Is the Ossur Navii Knee?

  2. How the Ossur Navii Knee Works (Sensors & AI Control)

  3. Key Features & Specifications

  4. Who the Navii Knee Is Best For

  5. Durability, Waterproof Rating & Maintenance

  6. Warranty & Service Options

  7. Questions to Ask Your Prosthetist

  8. Final Verdict

1) What Is the Ossur Navii Knee?

The Össur Navii Knee is a fully waterproof microprocessor-controlled knee (MPK) designed for transfemoral amputees. Its standout feature is IP68+ certification, meaning it can be fully submerged in water without compromising performance. The knee combines lightweight construction, long battery life, and advanced AI algorithms to adapt naturally to walking speeds, slopes, and varied terrains.

2) How the Ossur Navii Knee Works (Sensors & AI Control)

At the heart of the Navii Knee is an inertial measurement unit (IMU) with gyroscopes and accelerometers. This allows the knee to process real-time data hundreds of times per second, adjusting hydraulic resistance for both stance and swing phases.

The advanced control system helps users walk smoothly on level ground, ramps, and stairs while maintaining safety and stability. Its AI-based motion detection learns user patterns over time, offering a more personalized walking experience.

3) Key Features & Specifications

Here are the highlights of the Ossur Navii Knee:

  • Waterproof Rating: IP68+ — safe for full submersion in salt water, chlorinated water, dirt and mud (Be sure to hose it off with fresh water after)

  • Battery Life: Up to 72 hours on a single charge.

  • Weight: Lightweight construction (approx. 2.7 lbs / 1.2 kg).

  • Functional Levels: Designed for K2 (limited community) through K4 (active/athletic) ambulators.

  • Modes: Customizable settings via Össur’s smart app for activity adjustment.

  • Stumble Recovery: Active protection that helps prevent falls.

  • Ergonomic Build: Slim profile designed to reduce weight and bulk.

4) Who the Navii Knee Is Best For

The Navii Knee is best suited for K2–K4 functional level amputees who want a balance of durability, water protection, and adaptive mobility.

  • K2 users: Gain confidence in short-distance walking, ramps, and curbs.

  • K3 users: Benefit from variable cadence, smoother transitions, and reliable outdoor walking.

  • K4 users: Athletes and highly active amputees who need advanced stability and durability.

It’s especially beneficial for patients who live in wet climates, enjoy outdoor activities, or require a prosthesis that can withstand water exposure.

5) Durability, Waterproof Rating & Maintenance

The Navii Knee’s IP68+ rating makes it one of the few MPKs fully designed for wet environments. Whether caught in heavy rain, at the beach, or working in conditions with water exposure, the Navii maintains full function.

Maintenance is simplified through Ossur’s service program, ensuring that users can rely on durability for years with scheduled checkups and app-based performance updates.

6) Warranty & Service Options

The Ossur Navii Knee comes with a 3-year standard warranty, extendable to 6 years with service coverage. Extended packages include maintenance, repairs, and access to a loaner knee during servicing.

Ask your prosthetist about service plans, especially if you anticipate high-activity use or frequent exposure to demanding environments.

7) Questions to Ask Your Prosthetist

When considering the Navii Knee, ask your prosthetist:

  • Am I a good candidate for the Navii Knee based on my K-level?

  • How will the waterproofing benefit me compared to other MPKs?

  • Can I trial the Navii before committing?

  • How often will service and maintenance be required?

  • Which foot will pair best with my activity level and this knee?

8) Final Verdict

The Össur Navii Knee sets a new benchmark for waterproof durability and intelligent motion control. With its IP68+ rating, 72-hour battery life, and adaptive AI technology, it provides a dependable and versatile solution for transfemoral amputees from K2 through K4 functional levels.

For amputees seeking freedom, safety, and peace of mind in all environments, the Navii Knee is a standout choice in today’s MPK market.

👉 Interested in trying the Ossur Navii Knee? Contact Metro Prosthetics today to schedule your consultation.

More Posts