SURGICAL TREATMENT RESULTS IN PATIENTS WITH PELVIC BONE TUMORS IN CASES OF PREOPERATIVE 3D MODELING USE

The use of computer and magnetic-resonance therapy permits high accuracy visualization of tumor lesion zone in patients with pelvic bone tumors. More precise results concerning lesion zones before surgical intervention have been obtained in cases of 3D modeling use.

improvement of surgical treatment results due to determination of the optimal level for pelvic bone resection.

Cohort study was realized using 3D modeling based on computer tomography data applying the software packet RadiAnt DICOM Viewer with 3D Volume Rendering and the software packet «SolidWorks». Two patient groups were investigated: 1) 13 patients without preliminary preoperative 3D modeling (control group) and 2) 14 patients with modeling (main group). In both groups relapse-free survival and age-dependent survival were evaluated.

Tumor relapses were found in 6 patients (46.15 %) of control group and in 5 patients (33.33 %) of the main group. No statistically significant difference between groups concerning relapse-free survival results was detected. In both groups, medians of relapse-free survival were not obtained, two-year long relapse-free survival reaching (53.8 ± 13.8) % and (66.7 ± 12.2) % in control and main groups, respectively. Analyzing the cor- relation between patients age and results obtained the authors demonstrated the two-year relapse-free survival to reach (47.4 ± 11.5) % and (88.9 ± 10.5) % in patients aged above 40 and below 40, respectively (p = 0,06).

Because of small sample sizes in both groups, the use of 3D modeling does not demonstrate any signif- icant difference regarding two-year relapse-free survival. However, there is a tendency for further progress. The search of approaches for improvement of the treatment results for pelvic bone tumor patients remains among the most important study problem in current orthopedics for tumor patients.