What is the coronal alignment for a SACH foot in a TT prosthesis?

The coronal alignment for a SACH (Solid Ankle Cushion Heel) foot in a transtibial (TT) prosthesis typically requires an inset alignment of 0-12 mm. This alignment consideration helps accommodate the broader base of support needed for stability, especially when the foot initially makes contact with the ground during the gait cycle.

Having the foot inset allows for better alignment of the knee and promotes a more natural gait by reducing the moment arm created at the knee joint. This is particularly important as it contributes to controlling knee stability during weight-bearing activities and provides overall biomechanical efficiency during ambulation.

In transtibial amputees, the specific range of inset (0-12 mm) is generally deemed effective for maximizing the cosmesis and functionality of the prosthetic limb. This helps ensure that the user can walk naturally and engage in various activities with confidence and stability.