II. Definitions
- Flatfoot (Pes Planus)
- Foot medial longitudinal arch depression or loss on weight bearing (but present while on tip-toe)
III. Associated conditions
- Heel eversion (valgus)
- Forefoot abduction
IV. Differential Diagnosis
- Apparent Flatfoot in infants and toddlers under age 2
- Due to fat pad in area of longitudinal arch
- Fat pad atrophies with weight bearing
V. Types
- Flexible Flatfoot or Physiologic Flatfoot (Tight heel cord)
- Rigid Flatfoot or pathologic Flatfoot (Hindfoot Arthritis)
- Traumatic Flatfoot (Ruptured posterior tibial tendon)