Calcium sulfate cement augments transient stability of pedicle screw in osteoporotic vertebral body
10.3969/j.issn.2095-4344.2014.26.018
- VernacularTitle:硫酸钙骨水泥增强椎弓根螺钉置入骨质疏松椎体的瞬时稳定性
- Author:
Aiguo ZHU
;
Feng ZHANG
;
Yong GE
;
Yong CAO
;
Chi ZHANG
;
Yun CHEN
- Publication Type:Journal Article
- Keywords:
osteoporosis;
internal fixators;
calcium sulfate;
biomechanics
- From:
Chinese Journal of Tissue Engineering Research
2014;(26):4195-4199
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:Poor implant anchorage in osteoporotic bone impacts its stability and requires the new solutions for the treatment. The augmentation technique with bone cements or bone substitutes is one strategy for the solutions. OBJECTIVE:To evaluate the transient stability of pedicle screw augmented using calcium sulfate cement in osteoporotic vertebral body. METHODS:Fresh calf lumbar vertebrae were selected to measure bone density, and then classified into four groups:the group by pedicle screw in normal vertebral body;the group by pedicle screw augmented using calcium sulfate cement in normal vertebral body;the group by pedicle screw in osteoporotic vertebral body;the group by pedicle screw augmented using calcium sulfate cement in osteoporotic vertebral body. Pedicle screw of equal specification was twisted into the tested pedicle of vertebral arch. The maximum axial screw pul-out strength and the maximum energy required to failure were recorded so as to assess the transient stability of pedicle screw augmented using calcium sulfate cement. RESULTS AND CONCLUSION:The maximum screw pul-out strength and the maximum energy required to failure were significantly less in osteoporotic vertebral body compared with normal vertebral body (P<0.05). The maximum screw pul-out strength and the maximum energy required to failure after augmentation using calcium sulfate cement were significantly increased (P<0.05). The maximum screw pul-out strength and the maximum energy required to failure after augmentation using calcium sulfate cement were identical between normal group and osteoporosis group. These results suggested that calcium sulfate cement could effectively increase the transient stability of pedicle screw. Calcium sulfate cement is effective in augmenting fixation in osteoporotic bone, and has potential in clinical application.
