Fig. 6

Correlation analysis. The correlation coefficient between the average CT value and the median wall thickness was r = 0.37, p = 0.0196 (p < 0.05), which was statistically significant and positively correlated. The condition of the canine femoral nonunion model after 24 weeks, the healthy side and the affected side were modeled respectively Analysis process of the bone healing group: X-ray, micro-CT, and CT scans were performed at 24 weeks. CT scans in DICOM3.0 standard format were stored and modeled in the software Mimics. The healthy limb and the affected side were used to simulate the 3D geometric model after internal fixation was removed, and the mesh was divided. The average CT value and median wall thickness were obtained by finite element analysis. The values measured after the simulated removal of the internal fixation on the affected side and the median wall thickness ratio (R2) and healing index ratio (R3) on the healthy side were used as indicators to observe and evaluate the degree of bone healing. After a sudden death, the bilateral hindlimbs were removed, and the degree of bone healing was judged by X-ray, CT, micro-CT, and general appearance. Standard parts of the hindlimbs were made, and the degree of bone healing was analyzed and judged. The degrees of bone healing judged by the three methods were compared and analyzed, proving that the bone is not healed