How does a flexible keel foot affect socket forces on the residual limb?

A flexible keel foot is designed to allow for more natural movement and adaptive responses during gait compared to more rigid foot designs. This flexibility enables the foot to absorb and distribute forces more effectively, reducing the impact and pressure transmitted to the residual limb.

When the foot flexes during activities such as walking or running, it acts somewhat like a spring, either accommodating uneven terrain or adjusting through the stance phase of gait. This adaptive characteristic serves to minimize shear forces and localized pressure points on the residual limb, leading to a more comfortable experience for the user. The reduced socket forces help diminish the risk of skin breakdown or discomfort that can arise with excessive pressure, ultimately promoting better overall limb health and function.

In contrast, rigid foot options tend to transfer greater forces directly to the socket and, consequently, to the residual limb, which can lead to increased pressure and potential discomfort for the wearer. The flexible keel foot, therefore, plays a crucial role in enhancing the overall biomechanics and comfort for an individual using a prosthesis, particularly during varied activities and surfaces.