Pseudarthrosis and delayed union are two types of malunion events that can occur during fracture healing, and it is necessary to define and recognize the differences between them. Pseudarthrosis is defined as a case of consolidation failure in which a false joint is formed, including the presence of synovial fluid. Delayed union, or a delay in the fracture consolidation, is a condition where consolidation is not present and there is no evidence that it might occur, but there are no signs of movements in the focus of the lesion or of a "false joint": the bones simply do not unite (Jupiter & Ruedi, 1992; Miller & Phalen, 1947; Muller et al. 1990; Muller, 1965; Weber & Cech, 1976).