A heel post modification impacts which phases of the stance?

The heel post modification primarily affects the contact and mid-stance phases of gait. This modification is designed to enhance stability and control during initial contact with the ground, where the heel first strikes. By altering the heel post, it can help in realigning the foot and improving shock absorption, which is crucial during this phase.

During the mid-stance phase, the foot is flat on the ground and weight is being transferred through the limb. The heel post modification supports a better weight distribution and can help in maintaining appropriate alignment and balance, facilitating a smoother transition into the propulsion phase. By improving stability in contact and mid-stance, individuals may experience enhanced comfort and performance during gait activities.

The other phases mentioned in the incorrect options, such as swing and propulsion, are typically less influenced by heel post modifications. The swing phase occurs when the foot is off the ground and does not require the same level of heel stabilization as contact and mid-stance. Propulsion, while important in gait, is influenced more by forefoot and toe modifications rather than adjustments made at the heel.