Biomechanical Comparison of Three Different Screw Designs in Osteoporotic Spine Fixation


Sungur M., Sarıyılmaz K., Özkunt O., Cingöz T., Gemalmaz H. C., Yürektürk Y., ...Daha Fazla

XIII. International Turkish Spine Congress, İzmir, Türkiye, 3 - 06 Nisan 2019, ss.56

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: İzmir
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.56
  • Acıbadem Mehmet Ali Aydınlar Üniversitesi Adresli: Evet

Özet

BIOMECHANICAL COMPARISON OF THREE DIFFERENT SCREW DESIGNS IN OSTEOPOROTIC SPINE FIXATION PURPOSE: The aim of this study is to biomechanically compare standart pedicle screw, dual-threaded pedicle screw, and cemented dual threaded pedicle screw in an osteoporotic spine model MATERIALS AND METHODS: Twenty-four synthetic osteoporotic bone blocks were separated to 3 groups, according to the screw designs: 1) standart pedicle screw; 2) dual-threaded pedicle screw; 3) cemented dual-threaded pedicle screw. Samples were placed on a universal testing machine and pullout loads were measured. Independent samples Kruskal-Wallis test was utilized within 95% confi dence interval and p value <0.05 to test for statistical signifi cance. RESULTS: The mean pullout strength was 32.72 N (SD±12.53) in Group 1, 37.87 N (SD±19.29) in Group 2, and 78.46 N (SD±23.59) in Group 3. The results were statistically signifi cant (p<0.05). Inter-group comparisons revealed that cemented pedicle screws had a signifi cantly higher pullout strength (Group 1-3 p= 0.003, Group 2-3 p= 0.015). Although dual-threaded screws had higher pullout strengths when compared with standart pedicle screws, the difference was not statistically signifi cant (p=1.00).CONCLUSION: Our results showed that cemented pedicle screws had signifi cantly higher pullout strength. To achieve a more stable fixation in osteoporotic patients, cemented dual-threaded screws will be a good option.