What is the appropriate amount of acceptable pistoning in a TT socket?

The appropriate amount of acceptable pistoning in a trans-tibial (TT) socket is commonly recognized as around 1 cm. Pistoning refers to the movement of the residual limb within the prosthetic socket due to various factors such as gait and the dynamics of walking. A certain degree of pistoning is expected during movement, but excessive pistoning can lead to discomfort, skin issues, and a compromised fit of the socket.

Keeping the movement within this accepted range, specifically about 1 cm, ensures that the fit remains secure enough to support the user's gait while still allowing for some necessary movement. This balance helps in maintaining comfort and function, providing the necessary stability without creating undue pressure or friction on the residual limb. Thus, 1 cm is considered optimal for both performance and comfort in a trans-tibial prosthetic socket.