To improve knee flexion in patients with PF contracture, the prosthetic foot should be placed into more:

To enhance knee flexion in patients with a plantarflexion (PF) contracture, placing the prosthetic foot into more dorsiflexion is a viable approach. When the foot is positioned in dorsiflexion, it effectively shifts the weight line anteriorly over the foot. This adjustment encourages the tibia to move forward in relation to the foot, which increases the potential for knee flexion during the stance phase of walking.

The rationale lies in the biomechanics of gait. When dorsiflexion is increased, it helps facilitate the bending of the knee as the body progresses over the foot. This is particularly beneficial for individuals with PF contractures, as it counteracts the tendency of the foot to remain in a plantarflexed position, which can limit knee motion and hinder movement efficiency during ambulation.

In contrast, options like plantarflexion would push the weight line posteriorly, making it more challenging for the knee to flex. The roles of supination and pronation primarily pertain to the stability and alignment of the foot and ankle rather than directly impacting knee flexion mechanics. Therefore, dorsiflexion is the most effective choice to promote improved knee flexion in this context.