The interface is the part of the prosthesis that goes next to your skin; this may be made of various gels like silicone, foam or even something as simple as a prosthetic sock.


This is the mechanism used to hold the prosthesis onto your limb. It may incorporate a gel liner with a locking pin, a suspension sleeve or it can be held on by suction. These various types should be discussed with your prosthetist during the design stage to help make the prosthesis better accommodate your lifestyle and limb type.



  • Weight activated 
  • Single axis 
  • Polycentric 
  • Pneumatic 
  • Hydraulic 
  • Microprocessor Controlled (MPC) knees:

The introduction of the 3C100 C-Leg® microprocessor-controlled knee-shin system in 1999 from Otto Bock initiated a revolution of sorts in trans-femoral ambulation. Essentially, the C-Leg’s on-board circuitry does the thinking and lets the above-knee amputee concentrate on other things while walking. The C-Leg functions through real-time gait analysis to control hydraulic swing- and stance phase resistance. Built-in sensors provide information to the microprocessor 50 times per second to determine the precise phase of gait. The microprocessor then makes instantaneous adjustments to knee function, using algorithms developed from studies of how thousands of people walk, fine-tuned for the wearer’s unique needs and characteristics.


The SYMBIONIC LEG from Össur is the first complete bionic leg. Combining a powered ankle and an adaptive microprocessor knee joint, the SYMBIONIC LEG provides unmatched benefits for trans-femoral amputees. The active toe lift in swing clears the ground and minimizes the risk of tripping. Should a stumble occur, an advanced stumble recovery feature protects the user from a fall by providing instant stance support.

New developments in Össur's proven bionic technology mean that the RHEO KNEE can recognize and respond even better to the most subtle changes in walking speed and terrain. Using sophisticated artificial intelligence, it continuously learns and adapts to an amputee's walking style and environment.