Lower Limb Prosthetics

Trans Femoral (Above Knee)
The basic above knee prosthesis are usually made up of the following:

  • The socket and it’s interface.
  • The suspension mechanism.
  • The knee unit
  • The shank (pylon).
  • The prosthetic foot.

Trans Tibial (Below Knee)
The basic below knee prosthesis are usually made up of the following

  • The sockets and it’s interface.
  • The suspension mechanism.
  • The shank (pylon).
  • The prosthetic foot.

Safe and effective prosthetic use requires that the prosthesis be suspended comfortably and consistently on the limb during patient activity. All suspension methods must include two goals: holding the prosthesis firmly to the limb during walking and allowing the patient to sit comfortably. The choice of suspension is influenced by the patient’s current and future activities, goals and physical abilities. One commonly prescribed suspension system is a sleeve made of neoprenem urethane, silicone or latex. A silicone suspension method has two components. The first, a pliable sleeve, usually made of a sillicone polymer or thermoplastic elastomer which is one to nineteen mm thick and has a short pin incorporated at the distal end. The pin inserts into a locking mechanism embedded at the base of the prosethetic socket. Prosthetic feet are most often categorized by the combinations of functional tasks that are designed to stimulate. They can generally be grouped in to one of four designs:

  • Non-articulate feet (e.g. SACH feet).
  • Articulate designs (e.g. single axis and multiaxial designs).
  • Prosthetic feet with elastic keels (e.g. SAFE feet).
  • Dynamic-response or energy-storing designs (e.g. Seattle foot and the Flex-foot).