Powered Microprocessor Knees
Powered Microprocessor knees are transforming what’s possible for individuals with above-knee amputations. Unlike traditional microprocessor knees that only control resistance, powered knees actively provide motorized assistance—helping patients rise from a chair, climb stairs, and walk with greater ease and symmetry. By restoring some of the muscle power lost after amputation, these devices reduce fatigue, improve confidence, and create a smoother, more natural gait.
Today, two major powered knee systems stand out: the WillowWood INTUY® Knee and the newest generation Össur Power Knee. Let’s break down what each has to offer.
Powered Microprocessor Knees
WillowWood INTUY® Knee
The INTUY® is WillowWood’s flagship powered microprocessor knee, designed with a strong focus on torque and efficiency.
Key Highlights:
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Provides up to 100 Nm of active torque assistance for powerful, confident movements.
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Compact build height of about 255 mm (10 inches), allowing easier integration into many prosthetic setups.
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275 lb weight limit, accommodating a wide range of users.
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120° knee flexion range for natural sitting and bending.
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Battery life up to 44 hours standby with a 2-hour full recharge time.
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Regenerative charging technology captures energy during certain movements to extend battery life.
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IP45 protection rating makes it splash- and dust-resistant.
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Offers powered extension to assist with standing, biking assist mode, and seamless support for ramps and stairs.
In short, the INTUY® is designed for strength, quiet performance, and long use time—ideal for those who need a reliable, high-torque powered solution.
Powered Microprocessor Knees
Össur Power Knee
The Össur Power Knee is the original pioneer of powered prosthetics, and its latest generation introduces significant updates to make it lighter, smarter, and more user-friendly than ever.
Key Highlights:
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Weight: About 2.65 kg (5.8 lb) including battery pack, making it easier to integrate without feeling bulky.
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Build Height: Approximately 27.6 cm (10.75 in).
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Flexion Range: 120° for natural sitting and stair use.
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Weight Limit: Up to 256 lb (116 kg).
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Battery: Around 25 hours of typical use with a full recharge in about 5.5 hours. Swappable battery packs allow extended use.
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Protection: Rated IPX54 for dust and splash resistance.
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Functional Capabilities:
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Powered extension helps users stand up with less effort.
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Controlled resistance when descending stairs or ramps.
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Adaptive real-time stance and swing control for stability on varied terrain.
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Energy-returning stance flexion stores and releases energy for smoother gait.
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Intuitive standing lock feature for balanced weight distribution.
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The newest Power Knee is designed to give users powered support in daily activities while improving gait symmetry and reducing strain on the sound side limb. Clinical research on this generation shows measurable improvements in walking quality, sit-to-stand ease, and stability compared to non-powered alternatives.
Powered Microprocessor Knees Side-by-Side Comparison
| Feature | WillowWood INTUY® | Össur Power Knee |
|---|---|---|
| Max Power / Torque | Up to 100 Nm assistance | Powered flexion & extension, optimized for symmetry and energy return |
| Weight | Lightweight build | 2.65 kg with battery |
| Build Height | 255 mm (10 in) | 276 mm (10.75 in) |
| Battery Life | ~44 hr standby, 2 hr full recharge, regenerative charging | ~25 hr use, 5.5 hr recharge, swappable batteries |
| Weight Limit | 275 lb | 256 lb |
| Flexion Range | 120° | 120° |
| Special Features | Regenerative charge, powered standing, biking assist | Adaptive gait algorithms, powered sit-to-stand, energy-returning stance flexion |
Which Powered Microprocessor Knee Is Right for You?
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Choose the INTUY® if you want maximum torque for sit-to-stand and ramps, plus long standby battery life and regenerative charging for fewer worries about downtime.
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Choose the Power Knee if you want a lighter, more refined device with swappable batteries, proven clinical results, and advanced adaptive control for walking symmetry and terrain handling.
Both systems are excellent options, but the right choice depends on your activity level, daily environment, and personal goals.
Metro Prosthetics Can Help
At Metro Prosthetics, we work closely with patients across Maryland to evaluate advanced prosthetic technologies like the INTUY® and the Össur Power Knee. Our team can help you trial these systems, coordinate with your therapy team, and ensure insurance documentation is handled correctly.
Contact Metro Prosthetics today to learn more about powered knee options and find out which solution is the best fit for your lifestyle.
