IDS ::: Prosthetics ::: Suspension Types

Types of Suspension:

Locking liners
Self suspension
Suction
Suspension Sleeves
Soft suspension
Corsets
Pelvic band (for lower limb only)

Locking liners
If the liner incorporates a lanyard (cord) or ratchet pin it provides suspension of the prosthesis also. A lanyard passes through a hole in the distal end of the socket. Pulling the lanyard and anchoring it locates and secures the liner and thus the residual limb. A ratchet pin works in a similar manner, being anchored by a mechanism in the distal end of the socket.

A transtibial locking liner donned, showing the attachment pin which engages in the socket lock

Self Suspension
Where the shape of the socket and/or liner grips the underlying skeletal anatomy for example the femoral condyles.

Long established ankle disarticulation amputation

Pelite liner pulled on

Liner slid into socket

Suction
Where the volume of the socket is carefully matched to the volume of the residual limb and an air tight seal is formed.

Suction socket showing one way valve, which retains partical vacuum in the distal end of the socket.

Suspension sleeves
Where suspension and sometimes an air-tight seal is achieved by rolling a flexible sleeve over the junction between the socket and the more proximal residual limb.

Soft suspension
Effectively straps or garments made of a flexible material such as neoprene, leather or lycra. This includes such items as cuffs and stockings.

Corsets
Some prostheses, particularly older designs, incorporate strap or lace-up sections

A conventional transtibial metal exoskeletal prosthesis with blocked leather thigh corset suspension.

Pelvic bands
If a soft suspension system for a trans femoral amputee is considered to give insufficient control, a stiff pelvic band may be connected to the prosthesis via a hip joint. Generally the joint permits only flexion and extension in an effort to provide the amputee with some lateral stability. However, some designs are more complex.

Metal exoskeletal transfemoral prosthesis with pelvic band.

N.B. The pelvic band may still be relatively common but the structure is is an almost obsolete specification.

Use the links below to find out more information on 'The Socket':
::: Stump Socks ::: Socket Liners ::: Socket Construction ::: Suspension Types :::