Identification of Pedicle Screw Pullout Load Paths for Osteoporotic Vertebrae
- Author:
Venkatesh KRISHNAN
1
;
Vicky VARGHESE
;
Gurunathan Saravana KUMAR
;
Narayan YOGANANDAN
Author Information
- Publication Type:Basic Study
- From:Asian Spine Journal 2020;14(3):273-279
- CountryRepublic of Korea
- Language:0
-
Abstract:
Results:Pullout strength decreased by 36% when the size of the revision screw was increased by 1 mm, while it increased by 35% when the size of the revision screw was increased by 2 mm compared to the index screw value. While the morphologies of the load paths were similar in all cases, they differ between the two groups: the larger screw responded with generally elevated stiffer path than the smaller screw, suggesting that revision surgery using a larger screw has more purchase along the inserted body-pedicle axis.
Conclusions:A larger screw enhances strength and increases biomechanical stability in revision surgeries, although the final surgical decision is made by the clinician, which includes the patient’s anatomy and associated characteristics.
