What condition may occur due to excessive adduction of the prosthetic pylon at midstance?

Excessive adduction of the prosthetic pylon at midstance can lead to genu varum, often referred to as "bow-leggedness." This occurs because the alignment of the prosthetic limb causes a misalignment of the knee joint, resulting in increased stress on the lateral structures. In a conventional gait cycle, when the prosthetic pylon is excessively adducted, it shifts the weight-bearing line toward the midline, creating a mechanical disadvantage that affects knee stability and alignment.

As a result, the body's compensatory mechanism may lead to the development of genu varum, which is characterized by an inward angulation of the knee joint. This can put additional strain on the ligaments and can result in discomfort or further musculoskeletal issues if not addressed. It's crucial in prosthetic fitting and alignment to ensure that the pylon maintains proper alignment to facilitate an efficient gait pattern and to prevent secondary complications such as this alignment issue. Proper assessment and adjustment during the fitting process are essential to maintaining optimal function and comfort for the user.