What is a prosthetic liner?
A liner is a protective sleeve made of a flexible, cushioned material. In leg prosthesis use, it is pulled over the residual limb (remaining limb) and sits between the limb and the socket. The socket is the shell that surrounds the remaining limb and connects the person to their prosthesis. The liner creates an interface between these two structures, reducing movement and friction between the skin and the socket.
The main functions of the liner are:
- Providing a comfortable and secure hold for the prosthesis
- Protecting the remaining limb against impact, pressure and friction
- Increasing comfort by stabilizing soft tissue
When vacuum- or suction-based suspension systems are used, an additional sealing sleeve may be needed.
Liner material types
Liners are made from various materials to work with different suspension systems. Each material has its own characteristics:
- Silicone liners: Durable while providing high stability and good adhesion; they stabilize soft tissue.
- Copolymer liners: Have a soft and highly elastic structure; because they can be thermally shaped, they can be adapted to the remaining limb and are suitable for dry skin.
- Polyurethane liners: Balance pressure distribution in the socket; they cushion impact on sensitive, bony or scarred limbs.
Which liner material and type is suitable varies according to the structure of the remaining limb, the suspension system used and the person's lifestyle. This choice is made with a prosthetics specialist, in line with the specialist physician's assessment and prescription.
How is a liner put on and taken off?
Before donning, it is important that both the remaining limb and the inside of the liner are dry. The general approach is as follows:
- The liner is turned inside out as far as possible and placed on the end of the limb with the cap at the distal end facing outward.
- The liner is rolled upward evenly and carefully; wrinkles and air pockets are avoided.
- In pin systems, the pin should be aligned with the longitudinal axis of the remaining limb.
- When taking it off, the liner is simply rolled downward; care is taken that the edge does not bunch up in a way that pinches the tissue.
The surface must not be damaged by sharp fingernails or pointed objects. Sprays or lubricating creams suitable for the material can be used to make donning easier; the use of powder should be avoided.
Liner cleaning and care
The liner should be cleaned step by step after each use and at least once a day. General recommendations:
- It is turned inside out, washed in lukewarm water with a suitable cleaning lotion, rinsed thoroughly and dried with a lint-free cloth.
- It is dried on a suitable drying stand to keep its shape; it is kept away from radiators and direct sunlight.
- Washing machines, tumble dryers, scented or dyed soaps and alcohol-based antibacterial products should not be used.
Although antibacterial additives provide extra protection against odor, they do not replace daily cleaning.
Skin care and possible issues
Proper skin care helps reduce pressure points and friction. Gentle cleansing of the skin and moisturizing irritated areas with suitable products are recommended. Increased sweating may occur, especially in the first weeks; in this case, more frequent cleaning is helpful.
Situations such as red lines along the edge of the liner, excessive sweating or fit problems may result from different causes, ranging from inadequate liner fit to material unsuitability. In such cases, a prosthetics specialist or physician should be consulted.
This content is for informational purposes; you should consult your physician for diagnosis and treatment.
