According to bench alignment guidelines, where should the knee be positioned relative to the weightline?

The guideline for knee positioning in relation to the weightline is critical for ensuring optimal function and stability of a prosthetic limb. Positioning the knee 5-25 mm posterior to the weightline is ideal as it allows for better weight distribution during ambulation and enhances stability when standing and walking. This placement ensures that the gravitational forces acting on the prosthetic limb are balanced, reducing the risk of the knee buckling during the stance phase and providing a more natural gait.

When the knee is positioned too far anterior, it can lead to instability as the weight can shift forward, potentially causing the wearer to fall. Conversely, a knee that is positioned too far posterior could hinder smooth movement and weight transfer, making it difficult for the user to initiate walking or effectively carry out activities of daily living.

Thus, positioning the knee within the specified range relative to the weightline is crucial for function, safety, and comfort in individuals using a prosthetic limb.