| 1 | Socket inner face, fits into hard socket. |
| 2 | Hard plastic coupled with socks |
| 3 | Hard plastic coupled with gel |
| 4 | Hard plastic w/ suction skin fit |
| 5 | Flexible inner liner coupled with socks |
| 6 | Flexible inner liner coupled with Gel |
| 7 | Flexible inner liner w/ suction skin fit |
Holds prosthetic to body
| 1 | Silesian Belt : usually belt raps around patients waist attached to prosthesis |
| 2 | Gel liner w/ pin or Lanyard strap : usually Silicone or Urethane rolls on skin holding by a suction to the skin, then a mechanical lock occurs between the exterior pin or strap on liner to the socket. |
| 3 | Gel liner w/ Suction Ring & valve : usually Silicone or Urethane rolls on skin holding by a suction to the skin, ring will evacuate air out of socket via one way valve. |
| 4 | Pelvic Belt w/ Hip Band : Usually coupled with a metal band that sits on hip attached to leather belt that goes around waist. |
| 5 | TES Belt : Removable Neoprene belt pulled onto socket raps around waist. |
| 6 | Total Suction : This type permits air to be evacuated from socket via a valve, socket is held to residual limb by outside air pressure, often belts and straps can be eliminated. |
Can come in many shapes and sizes.
They are broken down into two types:
Single Axis : Single knee joint, also can be constructed with Stance control (the ability of the knee to lock preventing it from buckling when weight is applied on it).
Polycentric : More than one knee joint, primarily used on Long Above Knee amputations for a lower profile design.
Single Axis & Polycentric knee types :
| 1 | Manual Lock : Will stay locked until manually released. |
| 2 | Constant Friction : Knee joint has capability to free swing, speed is set by a friction screw not a variable speed but a constant speed determined by amount of friction applied |
| 3 | Fluid Control : Swing of knee controlled by a Hydraulic (fluid) or Pneumatic (air) unit giving prosthesis Cadence Variability (ability to change speeds according to amputees activity) |
| 4 | Microprocessor Controlled : Usually a fluid controlled knee coupled with a microprocessor to control the rate the fluid reacts depended on the step of the patient. Usually has stance (knee can lock up) capabilities controlled by the microprocessor unit in knee. |
The rigid shaft or tube below prosthetic knee controls the length and attaches knee to the foot.
Below are general types with a brief description and function.
| 1 | SACH : Hard internal keel that has no movement with firm a foam cosmesis. |
| 2 | Elastic or Flexible Keel : Simulates ankle motion with out true ankle joint. |
| 3 | Single Axis Foot : Ankle motion in one plane going forward and backward, can be constructed with various keel types. |
| 4 | Multi-axial Foot : Ankle motion in more than one plane, can be constructed with various keel types. |
| 5 | Energy Responsive Foot : Keel is made of composite materials that when loaded by body weight can give return from heel strike to toe off. A good example is how a diving board reacts when someone jumps on, it will load then spring off. This type of foot can be constructed to simulate ankle motion without a true ankle joint or it can be incorporated into a Single Axis or Multi-axial Foot. |