Figure 8.

Short segment instrumentation failure. This patient suffered a L1 burst fracture and scored 8 on the load sharing classification system. Apposition of bone fragments: 3 (A); Vertebral body comminution: 3; an intra-vertebral cleft or cyst is also present (arrow) (B). Kyphotic correction: 2 (C). After several months kyphotic deformity increased (D). In another patient, local kyphosis changed from 15º in standing radiograph (E) to 0º in CT scan (F) and was diagnosed of unstable vertebral body fracture.