In order to reduce lateral instability, which shoe modification would be the best option?

A lateral flare is an effective shoe modification used to enhance stability on the lateral side of the foot. By broadening the base of the shoe at the outside edge, it increases surface area and provides additional support during weight-bearing activities. This can help counterbalance forces that contribute to lateral instability, effectively reducing the risk of ankle sprains and falls, particularly in individuals with balance issues or certain foot pathology.

In contrast, the other options do not address lateral instability in the same manner. The medial wedge tends to increase support on the inside of the foot, which may inadvertently accentuate lateral instability instead of providing the necessary support. A lateral SACH (Solid Ankle Cushion Heel) serves a different function primarily associated with shock absorption rather than stability, as it focuses on cushioning rather than controlling lateral movement. A medial flare can provide some stability but does not effectively enhance the lateral side's support as a lateral flare does.