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Modular Knee Joint, pneumatic

Item #: 3R78
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Suggested HCPCS Coding: L5840 + L5850

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Discontinued -- limited stock available. Suggested replacement is the 3R106-PRO

The development of the 3R78 focused on a robust, dust-resistant design that is durable and resistant against environmental impacts.  This polycentric prosthetic knee joint with pneumatic swing phase control offers reliable stance phase security for users with moderate activity levels.

In the swing phase, the smooth yet powerful single chamber pneumatics (one chamber each for flexion and extension damping) does not run out of air, even at various walking speeds.  Smooth flexion and extension movements, and therefore an approximation of the physiological gait pattern, are made possible.  Here the joint geometry effectively shortens the prosthesis during swing through, resulting in more ground clearance.


Activity Level K3
Maximum Body Weight 220 lbs (100 kg)
Material Aluminum
Proximal Connection Pyramid Adapter
Distal Connection Tube Clamp (30 mm diameter)
Maximum Knee Flexion Angle 150 degrees
Product Weight 760 g
Build Height 211 mm
Distal Build Height 200 mm
Proximal Build Height 11 mm


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3R78, 3R78=KD, 3R78=ST - Instructions for Use

Instructions for Use

PDF Document | Published: Dec 16, 2020

LLP Prosthetist Documentation

Reimbursement: Documentation Guide


PDF Document | Published: Apr 17, 2023

LLP Physician Documentation Guide


PDF Document | Published: Apr 17, 2023

3R78 Modular Knee Joint - Product Information

Product Information

PDF Document | Published: May 1, 2014