Fracture gap movemet as a function of musculo-skeletal loading conditions during gait

摘要

To interpret the clinical fracture healing process, it is important to understand the local determinants involved. In addition to systemic factors, the local mechanical environment has a considerable impact on the fracture healing progress (Perren, 1974). In secondary bone healing, a developing callus reduces the relative movement between the proximal and distal bony fragments until cortical bridging occurs (McKibbin, 1978; Schenk, 1986). The amount of calus formed is strongly influenced by the interfragmentary movement (Wu et al., 1984; Goodship and Kenwright, 1985; Claes et al., 1995). IF the inter-fragmentary movement is too large, delayed union or non-unions can result (Schenk et al., 1986; Kenwright and Goodship, 1989). Animal experiments have shown that an optimal axial inter-fragmentary movement seems to be within the range of 0.2 to 1.0 mm (Goodship et al., 1988; Claes et al., 1995). Qualitative analysis suggests that shear movement further delays the healing process (Yamagishi and Yoshimura, 1955).