The Prosthetic Socket


The prosthetic socket joins your residual limb to the prosthesis and fulfils an important function: it ensures optimum adhesion and the proper fit of your prosthesis. In order to do so, the prosthetic socket is custom-made for each patient according to the shape and condition of the residual limb and the respective mobility grade.

The prosthetic socket consists of a liner, a matching closure system and a load-bearing outer wall (the actual socket), which forms the connection to other components (knee joint, prosthetic foot). The liner acts as a sort of “second skin” between the movable soft tissue of the residual limb (muscles, tissue, skin) and the hard shell of the socket. This minimises movement and friction between the skin and prosthetic socket.  The “second skin” is a thin protective membrane made of a flexible material that is rolled over the residual limb. It connects your residual limb to the prosthesis and protects the sensitive skin on the residual limb by reducing friction and pressure points of the residual limb in the socket. Selecting the right liner is essential in order to ensure the prosthesis fits well and is comfortable to wear. But a liner can only ensure optimum safety and comfort in combination with the right closure system that keeps the socket in place on the residual limb.

The prosthetic socket assumes the load-bearing function within the entire socket system. It constitutes the connection to the other components. Different versions are available and can be classified into three major groups:

Classic Prosthetic Socket of Ottobock.

Classic Prosthetic Socket

A socket consisting of lightweight carbon fibre structures and hardened resin. Fabricated either as a full-surface socket or as a framed socket in combination with flexible synthetic materials.

The SiOCX® TF Socket System of Ottobock.

SiOCX® TF Socket System

The innovative combination of a silicone inner socket and a lightweight carbon outer socket with flexible areas offers you maximum comfort, hygiene and functionality.


Various forces are at work in a prosthetic socket, which can affect the fit and adhesion of the prosthesis. With our Socket Technologies products, we want to give you more control over these forces.

Overview of the various forces at work in a prosthesis socket.

Impact forces are generated when the heel strikes the ground. Soft liner materials and shock-absorbent feet can be used to minimise impact forces.


Rotation forces occur during the stance phase, and can cause rotation in the socket. The shape of the socket combined with special connective techniques (e.g. negative pressure) can be used to minimise rotation forces.

Shear forces are also known as lifting forces. They occur during the swing phase and can be controlled with the help of the right liner material and correct closure system.

Design your own C-Leg Protector

Protector-Design von Ottobock.
Create your own Protector design at
Protector-Design von Ottobock.

Skinguard Technology

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Antibacterial products of Ottobock.
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