What condition could cause a narrow base of support during midstance in transtibial prostheses?

A narrow base of support during midstance in transtibial prostheses can be attributed to the positioning of the foot. When the foot is inset, it means that the foot is positioned closer to the midline of the body than optimal. This positioning results in a reduced lateral distance between the feet during the stance phase of gait, permitting less stability and a narrower base of support. This configuration can compromise balance and the overall gait mechanics because the user may struggle to maintain stability while bearing weight on the prosthetic limb.

The proper alignment of the foot plays a crucial role in the functional efficacy of the prosthesis. When the foot is inset, it can enhance the risk for falls and affect gait patterns as users may need to adjust their posture to accommodate a lack of stability. Therefore, careful assessment and adjustment of the foot positioning are necessary to optimize the performance of the transtibial prosthesis and ensure a safe and effective gait pattern.