Information for Clinicians

In the case that your clients / patients are not satisfied with their current knee, here are some things to consider:

Dissatisfaction can take two shapes:

1) The user does not complain, but has diminished their range of activities, or has forgotten even their own natural interests. This may be that they have learnt that they cannot walk fast, or even only with a single walking speed. They may have lost interest in going to places of interest because the grounds are uneven and perceived as scary to walk on. Or likewise, they may no longer go out for a walk with their partner out of fear of not being able to keep up.

2) User complains. The user may complain about the lack of safety, frequent falls or near falls, or may express well-out-of-budget wishes. Not knowing what joint your client currently uses, but knowing that many knee joints offer solutions or reversely lack solutions for particular use patterns, I suggest to evaluate the dissatisfaction as per the checklist of following functional  issues:

  • Stability / Security
  • Stumble recovery
  • Slope / Stairs Descent
  • Heat
  • Fast Walking speed
  • Wet use
  • Battery maintenance
  • Wading through grass / water
  • Flexible  choice of feet
  • Maximum kneeling angle
What ever their case, for most of them the VGK-Go! has an extensive package of functionality that may meet this very wide range of daily needs.
  • Heaviness of the limb because they have such a short stump.
  • Socket fit issues due to weight of prosthesis

In this case check out the VGK-S for amputees with short transfemoral stump.

Technical data
VGK Very Good Knee technische Daten

The VGK-Go! is rated for up to 125KG, for K2, K3 and K4 users.

Choice of proximal interfaces:

The VGK-Go! comes with three interfaces:

  • Proximal Pyramid: VGK125P
  • Proximal M36 abutment: VGK125M
  • Proximal Through Knee anchor: VGK125A


Class of Joint

The VGK is a fluidically controlled hydraulic knee joint as opposed to:

– electronically controlled hydraulics such as in C-leg-.

– using rheomagnetics such as in Rheo

– using hybrid pneumatics together with hydraulics  such as in Hybrid/Synergy.

– plain mechanical  designs such as 3R80

Stance Mode activation

The VGK-Go! is a default stance knee joint. (just like the C-leg, and Mauch SNS)

– as opposed to weight activation of stance mode as in 3R80.

– as opposed to geometric locking as in Total-Knee or as in other polycentric knees.

Stumble Recovery support

The VGK-Go! supports stumble recovery when the toe hits the ground prior to full extension.

-Stumble recovery support is not naturally present in knee joints .

-An example of a stumble recovery can be viewed.

Walking downstairs and downslope

The VGK-Go! supports  leg-over-leg walking  downstairs and down slope.

-The VGK-Go! has a remarkable steady action in the movement of the knee.

-The VGK-Go! is insensitive to any added weight being carried down stairs.

Thermal properties

The VGK-Go!, due to microkinetic control technology, provides significant compensation for the thinning out of the hydraulic fluids which can so easily cause loss of power in hydraulic knee joints.

-This thermal stability has been tested in the lab.

-This thermal stability has been tested in walking 600 steps downstairs.

-The frame of the VGK-Go! acts as a large cooling fin, literally drawing the heat out of the hydraulics.

Adaptive behaviour

The VGK-Go! is autoadaptive to user needs:

-The VGK-Go! speeds up when walking speed increases.

-The VGK-Go! stabilises movement walking downstairs and downslope.

-Terminal impact self regulates its strength.

Water resistance

The VGK is water resistant:

-For reasons of safety against the permissible depth of immersion under water , the maximum depth of use is waist-deep.

-See instructions for use.

Kneeling angle

The VGK-Go! has been constructed to allow maximum knee flexion in kneeling, socket permitting.

temperature stabilisation

Please see our “Fluidics in detail” page for further information on this.