As a transfemoral (above the knee) amputee, I have always appreciated sharing my experiences with fellow amputees. I compiled this private website to share my experiences with different prosthetic knees. In particular, I have been given the chance to test Orthomobility‘s VGK „VERY GOOD KNEE“, which I want to compare to Otto Bock‘s 3R80 mechanical knee and Otto Bock‘s C-LEG, as well as Otto Bock‘s new GENIUM, which I have also had a chance to test.

All of these are first-class knee joints for active amputees, have both swing and stance control. In other words, all of these knees enable different walking speeds, going down hills by putting weight on the knee while it is bending, going down stairs step-over-step. Also, each of these knees supports a natural walking style with the knee bending slightly and bouncing back after heel strike.

And yet there are differences, which, according to my opinion, become apparent when it comes to activities beyond walking and taking stairs:

  • Kneeling on the floor (should not make scratches, neither on the floor nor to the prosthesis!)
  • sitting down (knee should ideally swing freely)
  • going down really long hills or very many stairs (knee hydraulics becoming warm!)
  • having contact with water (most electronic knees don‘t like that!)
  • bearing additional weight (knee function might be adjusted for a fixed body weight only)
  • wearing different shoes (having different weight, which has an impact on the swing phase!)
  • sitting in a narrow place (the more knee angle, the better!)
  • feeling the weight (a heavy prosthesis can be a real problem with a short stump!)
  • and much, much more.

Move on to this page to see how I compare Orthomobility‘s „Very Good Knee“ VGK with Otto Bock‘s mechanical 3R80 and electronic C-Leg and Genium.

In 2013 the German Federal Ministry of Labour and Social Affairs sponsored a scientific study in which Ottobock’s C-Leg, Össur‘s Rheo Knee II, the VGK and the Orion knee (by Endolite) had been compared in a clinical cross-over study by a research unit of the University Hospital for Prosthetics, Orthotics and Rehabilitation in Münster, Germany. Interestingly, many aspects of the study results match with my own personal experience. See this page for my comments on some of the results, as well as a PDF download of the English study report.

Go to Compare VGK

Go to The Münster Study