Dorsal and plantar views illustrating common fracture lines in intraarticular fractures of calcaneus. A, Dorsal view: 1, sagittal fracture through posterior facet; 2, lateral wall fracture; 3, fracture line separating remainder of calcaneus from sustentaculum fragment; 4, transverse fracture through sinus tarsi; 5, fracture extending into calcaneocuboid joint. B, Plantar view: 1, medial wall fracture in which tuberosity fragment shifts distally and laterally with medial overlap; 2, tuberosity fragment has variable fracture line or lines.