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The pin locking system is one of the most simple suspension solutions for transtibial amputees. A gel liner with a special pin “clicks” into a locking mechanism (receiver) inside the leg. This system is great because the user can hear the clicks as the pin engages with the lock and knows that the prosthesis is secure and safe to walk. A small button is depressed to disengage the lock to take the prosthesis easily. This system works well for many transtibial amputees and does not require the use of a knee suspension sleeve.
HOW IT WORKS:
There are two main components of the pin locking system. The gel liner with the pin and the locking mechanism.
TO PUT ON:
A locking gel liner is rolled onto the residual limb and then placed into the socket. As the limb enters the socket, clicks indicate that the limb is locked into place.
TO TAKE OFF:
A small button is located on the prosthesis. This disengages the pin as the limb is simultaneously pulled up and out of the socket.
No, it should not be painful to walk with a pin system with a correctly fitting, snug, socket. Also, the pin is attached to the bottom of a padded gel liner with additional cushioning near the bottom of you limb.
Daily volume change is expected and can effect the fit (and snugness) of your prosthesis, but prosthetic socks can be used to snug the fit of the prosthesis. Prosthetic socks are worn over the gel liner and have a hole for the locking pin. Read more about prosthetic socks, here.
Generally, no. In order for the prosthesis to fall off, the button must be depressed while simultaneously pulling your leg out of the prosthesis. If you are especially concerned about this, there are several locking mechanisms that have a safety features. Some buttons utilize a safety lock (the button is twisted a ¼ turn like a key) to prevent the button to be depressed until it is unlocked. Other locking mechanisms work in the reverse manner and are pulled (instead of pushed) to disengage the pin from the locking mechanism.
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