ID 109590
Author
Mishiro, Takuya Department of Orthopaedic Surgery, Takamatsu Red Cross Hospital
Sairyo, Koichi Department of Orthopaedics, the Institute of Health Biosciences, the University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Shinohara, Akira Department of Orthopaedic Surgery, Jikei University Kashiwa Hospital
Chikawa, Takashi Department of Orthopaedic Surgery, Tokushima Municipal Hospital
Kosaka, Hirofumi Department of Orthopaedic Surgery, Takamatsu Red Cross Hospital
Dezawa, Akira Department of Orthopaedic Surgery, Teikyo University Mizonokuchi Hospital
Keywords
lateral mass screw
pedicle screw
insertional torque
Magerl technique
Roy-Camille technique
Content Type
Journal Article
Description
Study Design : Multicenter intraoperative biomechanical analysis. Purpose : This study aimed to assess the maximal insertional torque (MIT) of lateral mass screw (LMS) and pedicle screw (PS) in the cervical or thoracic vertebrae during surgery. Methods : During posterior spinal fusion, cervical or thoracic multi-axial screws were placed at different cervical or thoracic levels and the MIT was recorded for each screw revolution using an analogue torque wrench. Screw number was as follows : 11 PS at C7, 134 LMS (C3-6) (Magerl technique, 70 ; Roy-Camille technique, 64), and 33 PS in the thoracic region. Results : Average MIT values (cNm) were as follows : for PS (diameter : 3.5 mm) at C7, 45.3±21.9 in men and 60.0±20.1 in women (p=0.28) ; for Magerl screws, 69.0±20.5 in men and 58.6±15.7 in women (p=0.13) ; and for Roy-Camille screws, 51.0±17.9 in men and 42.4±15.9 in women (p=0.52). The average MIT for Magerl screws was significantly higher than that for Roy-Camille screws in men and women (both p < 0.01). Conclusions : Intraoperative insertional torque could be a good indicator to evaluate the purchase and help guide decisions on screw type and insertion technique. Further postoperative assessments with sequential X-rays are needed to reveal the significance of MIT during posterior spinal fusion.
Journal Title
The journal of medical investigation : JMI
ISSN
13431420
NCID
AA11166929
Volume
61
Issue
3-4
Start Page
393
End Page
398
Sort Key
393
Published Date
2014-08
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences