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Fig. 8 | BMC Musculoskeletal Disorders

Fig. 8

From: Variable fixation promotes callus formation: an experimental study on transverse tibial osteotomies stabilized with locking plates

Fig. 8

Panel a: the average cross-sectional polar moment of inertia (pMOI) measured along the bone axis in the three groups. On the x-axis the position of the investigated bone cross-sections with respect to the entire scan length. Panel b: a 3D reconstruction of a VFLS3 group sample. In this plot the fracture gap is centred around 50% of the scan. This plot shows that along the bone length, the callus generated by variable fixation is distributed farther from the bone axis (larger pMOI values). Furthermore, in bone segments implanted with VFLS the bone callus extends farther from the fracture gap. This is very evident in group VFLS3. For this group the pMOI values recorded in the proximal segment (VFLS3 prox) are larger than those in the proximal segment of the LS group. On the other side, in the distal segment (VFLS3 dist), where both groups featured standard locking screws, the pMOI profile is almost identical between VFLS3 and LS. The proximal to distal asymmetric bone callus formation can be appreciated on the VFLS3 samples depicted in panel B and confirms the observation made on standard X-rays

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