BIO LEG®
Move Farther.
Stand Stronger.
Walk With Confidence.
Bio Leg® is a powered microprocessor knee designed to help above-knee prosthesis users move with greater confidence through demanding daily activities, including sit-to-stand, stair ascent, longer walking distances, and uneven terrain like grass and gravel.
Bio Leg
®
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Variable reduction gear
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Controlled & safe power assistance
-
Intuitive movement algorithm
K Levels
K3
Warranty
3 Years
132°
Approved L-Codes
L5827, L5856, L5859
L5827
L5856
L5859
Weight Limit
275 lbs
Flexion Angle
(125 kg)
-
Variable reduction gear
-
Controlled & safe power assistance
-
Intuitive movement algorithm
Bio Leg
®
IDEAL FOR
®
Is Bio Leg
Right for Your Patient?
Bio Leg® is designed for active users with transfemoral, knee-disarticulation, hip-disarticulation, or bilateral lower-limb limb loss who need powered assistance for real-world mobility challenges. It may be an ideal solution for patients who want more support with standing from a seated position, ascending stairs, walking longer distances with less fatigue, and moving confidently across uneven terrain.
Patients with transfemoral, knee-disarticulation,
hip-disarticulation, or bilateral limb loss
Patients who need support with sit-to-stand movement
Users who fatigue during longer walking distances
Patients who encounter stairs, ramps, grass, gravel or uneven ground
Users who want powered assistance for demanding daily mobility
Appropriate Activity Level
Best suited for active users with community mobility goals who can benefit from powered support during demanding daily movement.
Daily Mobility Goals
Helpful for patients who want to stand up with more support, walk farther with less fatigue, and move more confidently throughout the day.
Functional Needs
A strong option for users who need assistance with sit-to-stand, stair ascent, longer-distance walking, and uneven terrain.
Clinical Considerations
Useful when the goal is to provide advanced powered mobility support that can be fit, tuned, and trained within real-world clinical care.
Patients with transfemoral, knee-disarticulation, hip-disarticulation, hemipelvectomy, or bilateral limb loss
Patients who need support with sit-to-stand movement
Users who fatigue during longer walking distances
Patients who encounter stairs, ramps, grass, gravel or uneven ground
Users who want powered assistance for demanding daily mobility
Appropriate Activity Level
Best suited for active users with community mobility goals who can benefit from powered support during demanding daily movement.
Daily Mobility Goals
Helpful for patients who want to walk more comfortably, move more efficiently, and stay active throughout the day.
Functional Needs
A strong option for patients who need support with sustained walking, daily movement, and routine transitions.
Clinical Considerations
Useful when the goal is practical mobility support that fits naturally into real-world clinical care.
IDEAL FOR
Is Bio Leg® Right for
Your Patient?
Bio Leg® is designed for active users with transfemoral, knee-disarticulation, hip-disarticulation, hemipelvectomy, or bilateral lower-limb limb loss who need powered assistance for real-world mobility challenges. It may be an ideal solution for patients who want more support with standing from a seated position, ascending stairs, walking longer distances with less fatigue, and moving confidently across uneven terrain.
Move Confidently on Uneven Terrain
Responsive knee control helps users move across grass, gravel, slopes, and other uneven surfaces with added confidence.
Safety-Focused Stability
Bio Leg® is designed to support secure movement through standing, walking, transitions, and changing real-world conditions.
Walk Further with Less Fatigue
Powered assistance helps reduce the effort required with each step, supporting longer and more comfortable daily walking.
Ascend Stairs With Powered Assistance
Bio Leg® provides powered support during stair ascent, helping users approach one of the most demanding daily mobility tasks with greater confidence.
Stand Up With Greater Support
Powered assistance helps support smoother sit-to-stand movement, reducing the effort users may need from their upper body and sound side.
Ascend Stairs With Powered Assistance
Bio Leg® provides powered support during stair ascent, helping users approach one of the most demanding daily mobility tasks with greater confidence.
User-Driven Design
Safety Without Compromise
Real-Time Adaptive Power
Practical Daily Performance
Engineered Around
What Matters
The Bio Leg® delivers practical performance where it counts.
Move Confidently on Uneven Terrain
Responsive knee control helps users move across grass, gravel, slopes, and other uneven surfaces with added confidence.
Walk Further with Less Fatigue
Powered assistance helps reduce the effort required with each step, supporting longer and more comfortable daily walking.
Safety-Focused Stability
Bio Leg® is designed to support secure movement through standing, walking, transitions, and changing real-world conditions.
Powered Assistance for
Where Patients Need it Most
Bio Leg® combines powered assistance with intelligent knee control to help support the daily movements that often demand the most from above-knee prosthesis users.
Stand Up With Greater Support
Powered assistance helps support smoother sit-to-stand movement, reducing the effort users may need from their upper body and sound side.
Stand Up With Greater Support
Powered assistance helps support smoother sit-to-stand movement, reducing the effort users may need from their upper body and sound side.
Engineered Around
What Matters
The Bio Leg® delivers practical performance where it counts.
PATIENT STORY
®
See Bio Leg in Action
After losing his leg in an emergency amputation caused by a blood clot in late 2024, retired Jacksonville police officer Thaddeus faced the daunting challenge of rebuilding his independence. His first prosthetic left him feeling unstable and hesitant with every step, but after his physician recommended the Bio Leg®, he experienced a dramatic improvement in confidence and mobility. Powered by smart motor technology that assists with standing and sitting, the Bio Leg® has helped Thaddeus regain an active lifestyle—allowing him to drive, meet friends independently, and walk with significantly less assistance. Now, he encourages others to explore advanced prosthetic technology, emphasizing that the Bio Leg® has restored both his freedom and confidence to live life on his own terms.
- Thaddeus
Bio Leg® User
Bio Leg®
Technical Specifications
Activity Level
Model
Amputation Level
Weight Limit Max
Width
Proximal & Distal Connection
Weight
Maximum Extension
Maximum Flexion Angle
Operating Temperature
Internal Power Source
Warranty
Reimbursement Codes
Specifications
Product Name
Activity Level
Model
Amp. Level
Weight Limit Maximum
Width
Proximal & Distal Connection
Weight
Maximum Extension
Maximum Flexion Angle
Operating Temperature
Internal Power Source
Warranty
Reimbursement Codes
Bio Leg®
K4, K3, K2
ASP001 / MS001
Transfemoral amputation, knee disarticulation
Load of 275lbs (125kg)
111.0mm
Male pyramid only
3kg including battery
0°
132°
14°F to 104°F (-10°C to 40°C)
Lithium-Ion Battery
-Fully charged in 3-4 hours
-Continuous usage for 22 hours
3 Years
L5827, L5856, L5859
*Please note that some specifications may be changed without notice in order to improve the performance of the product.