当前位置： SCI文献检索 > Acta Orthopaedica et Traumatologica Turcica期刊下所有文献 > Restoration of pull-out strength of the failed pedicle screw: biomechanical comparison of calcium sulfate vs polymethylmethacrylate augmentation.

Restoration of pull-out strength of the failed pedicle screw: biomechanical comparison of calcium sulfate vs polymethylmethacrylate augmentation.

Abstract：

OBJECTIVE:The aim of the present study was to compare calcium sulfate (CAS) and polymethylmethacrylate (PMMA) bone cements used for the augmentation of a failed pedicle screw with biomechanical pull-out strength (POS) testing. METHODS:Thirty lumbar vertebrae were harvested from 6 calves and bone mineral densities (BMD) were measured. Primary polyaxial pedicle screws were randomly inserted and pulled out and the POSs of the specimen were recorded. For revision, specimens were randomly assigned to the CAS-augmented pedicle screws group (Group 1) or PMMA-augmented pedicle screw group (Group 2). Pull-out tests were repeated to compare both groups. RESULTS:Mean BMD of the specimens was 1.006 ± 0.116 g/cm(2). There were no statistically significant differences between BMD results of the two groups (p=0.116). For Group 1, mean POS of primary screws was 2,441.3 ± 936.4 N and was 2,499.5 ± 1,425.1 N after CAS augmentation, demonstrating no statistically significant difference (p=0.865). In Group 2, mean POS of the primary screws was 2,876.6 ± 926.6 N and significantly increased to 3,745.5 ± 1,299.2 N after PMMA augmentation (p=0.047). There was also a significant difference in mean POS between the CAS and PMMA groups (p=0.026). CONCLUSION:Although CAS augmentation facilitates a revision screw POS as strong as that of primary screws, it is not as strong as PMMA augmentation.

journal_name

Acta Orthop Traumatol Turc

journal_title

Acta orthopaedica et traumatologica turcica

authors

Güler UO,Derincek A,Hersekli MA,Ozalay M,Cinar BM,Acaroğlu E

doi

10.3944/AOTT.2014.3193

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

202-6

issue

2

eissn

1017-995X

issn

2589-1294

journal_volume

48

pub_type

杂志文章

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