Treatment of Stage 4 Flatfoot.

Stage 4 flatfoot represents only a small proportion of flatfoot cases and is likely to become even rarer. The evidence base to guide treatment is limited to case series and expert opinion. Therefore, a pragmatic approach to treatment must be taken. Low-demand individuals may manage well with conservative treatment. Surgical management is complex, likely to require staging, and has a significant complication profile. Patients should be fully informed and understanding of this. First principles of surgery should be followed, including restoring hindfoot and ankle joint alignment, appropriate soft tissue balancing, and optimizing function by limiting arthrodeses and subsequent stiffness.