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Prosthetics & Orthotics




The VGK, Very Good Knee, is a CE marked fluidically controlled high class fluidic controlled prosthetic knee joint.
The patented fluidic control makes the joint adaptive to user demands, and due to built-in generation of energy required for valve control, charging is not required.
The VGK is produced by Orthomobility, an independent manufacturer in prosthetic device technology that aims to provide more access to mobility.
Out motto, 'Access to Mobility' means the end result: a very good knee joint built into the user’s prosthetic limb on a cost effective technology platform.
In summary, the VGK supports a high level of default-stance-security/stumble recovery, and adaptive behaviour in swing and yield, and is insensitive to changes in temperature.
Please do explore our site to find out more of the product and learn about the background to stumble control, and its supporting technology.

VGK Knee



Compare VGK

This is how I compare Orthomobility's "Very Good Knee" VGK with Otto Bock's mechanical 3R80 and electronic C-Leg and Genium. I use colors to say whether it is:

Very good

Quite good

Could be a problem

Real disadvantage


VGK 3R80 C-Leg Genium
Manufacturer Orthomobility Otto Bock Otto Bock Otto Bock
Type Mechanical, with innovative auto adaptive fluidics control Mechanical Electronic Electronic, with more sensors than C-Leg, being able to adjust to more different situations
Swing phase control
VGK 3R80 C-Leg Genium
Different walking speeds yes, slow to very fast yes, but not such a wide speed range. I haven’t found a setting supporting both very slow and very fast. yes, slow to fast yes, slow to very fast.
Effect of different
shoe weight
none. fluidic control adjusts automatically to different shoe weight bad. Heavier shoe means slower swing phase. Would require adjusting a screw setting to compensate bad. Havier shoe means slower swing phase. Would require different programming to adjust. none. Electronics compensates by adjusting the hydraulic unit automatically.
Natural walking style with knee bending and bouncing
after heel strike
yes, requires a bit of practice and a proper adjustment of the foot yes, requires a bit of practice and a proper adjustment of the foot yes, initial knee bending motion (before bouncing back) is damped smoothly yes, automatically having a few degrees of knee flexion on heel strike (Otto Bock calls it â€‍pre-flex“ function)
Stance phase control
VGK 3R80 C-Leg Genium
Effect of additional weight, e.g. when bearing something none. Fluidic control is able to compensate bad. Stance control is weight activated. Bearing additional weight could lead to stumbling none. Electronics compensates. none. Electronics compensates.
Effect of long descends or or long stairs down none. Fluidic control compensates. bad. The warmer the hydraulic unit gets, the more it looses its stance control function. OK. Electronics compensates by adjusting the hydraulic valves. However, due to the nature of the hydraulics, it might become too warm and then switch into a "safe mode" with no knee bending function. OK, same as with C-Leg
Swing characteristics when not walking Stance control active. knee is relatively stiff. This is the price for having a “safe” knee, which does not bend unintentionally. OK. Swings almost freely, slightly damped by spring Bad. Stance control active, knee is relatively stiff Best. Knee swings freely.
Cycling Mode yes, to be activated with a small handle. With configurable knee resistance and security mode: In cycling mode, a quick movement of the knee will give sufficient stability to stand on a flexed knee. yes. Normal mode is fine for cycling. yes, to be activated with a special 3-times tipping on forefoot. Second mode characteristics can be configured. yes, to be activated with a remote control, or as with C-Leg. Multiple „second modes“ with configurable characteristics.
Aspects for every day usage
VGK 3R80 C-Leg Genium
Maximum knee-angle perfect! Only restricted by the socket! With my short stump and socket, there is sufficient space so the knee can be bound to almost 180 degrees! good! knee can be bound to 160 degrees bad. Only about 120 degrees, prothesis could feel like an obstacle, depending on the situation OK, much better than C-leg.
Kneeling down Well supported by a plastic knee cap that protects the floor and prevents slipping away Moderate. Weight is supported by small plastic area. With old 3R80 model, foot goes up OK, but only if knee protector is mounted. Very bad. Would slip away on hard floor and/or make scratches in knee frame or flor.
Weight heavy, 1400 g OK, 1200 g heavy, 1400 g Very heavy, 1600 g. Could be too much for a short stump
Water-proof yes! Can be used under shower, and even when doing water-sports. However, should not be used in salt water. Don’t know. Probably a few rain drops don’t matter. No! Must be kept away from any water! Moreover, Charge socket is located such that even a few rain drops could cause damage. No, Must be kept away from water!
Handling Nothing
Nothing special Requires almost daily battery recharge, battery connector is a bit difficult to attach. Requires battery recharge every few days, however, battery connector is easy to attach
Restriction on the choice of prosthetic foot No restrictions. Can probably be used with any prosthetic foot of your choice No restrictions. Bad. Only allowed with a few Otto Bock feet, none of which are my personal preference Bad. Same as with C-Leg.
VGK 3R80 C-Leg Genium