The effect on the maximum vertical load of vertebroplasty and kyphoplasty on embalmed specimens

Abstract

Objective To study if the maximum vertical load was difference when bone cement were inpulsed by unilateral vertebral pedicle and bilateral vertebral pedicle or normal saline on vertebroplasty and kyphoplasty.Methods Select six embalmed vertebral specimens (T8-L5),free into 48 individual vertebrae were made into compression fracture model.All the specimens were divided into six groups.Group A and B applied unilateral KP and VP respectively,group C and D applied bilateral KP and VP respectively,Group E and F applied unilateral KP and VP with normal saline lavage vertebral body before the injection of bone cement.postoperative loading vertical again,measured the maximum vertical load,recorded the results,using SPSS statistical software for approximate t-test to compare the results.Results There is no significant difference between the maximum vertical loads after VP group and KP group (group A and group B:t' =0.746,P＞0.05; group C and group D:t' =0.312,P＞0.05; group E and group F:t' =0.830,P ＞ 0.05).There is no significant difference between the maximum vertical loads of unipedicular group and bipedicular group (group A and group C:t' =0.374,P ＞ 0.05 ; group B and group D group:t' =0.529 ; P ＞ 0.05).Whether using saline water irrigation or not,postoperative vertebral maximum vertical loads have no significant statistical difference (group A and group E:t' =0.821,P ＞0.05 ; group B and group F:t' =0.449,P ＞ 0.05).Conclusion Unilateral or bilateral injection of bone cement did not effect on the maximum vertical load,but the maximum vertical load was increasing after lavaging the specimens. Key words: Kyphoplasty; Vertebroplasty ; Bone cement; Lavage ; Maximum vertical load