The mechanical role of laminar hook protection of pedicle screws at the caudal end vertebra

被引：10

作者：

Margulies J.Y. ^{[1
]}

Casar R.S. ^{[2
]}

Caruso S.A. ^{[3
]}

Neuwirth M.G. ^{[2
]}

Haher T.R. ^{[3
]}

机构：

[1] Spine Service, Department of Orthopedic Surgery, Montefiore Medical Center, New York, NY 10467

[2] Department of Orthopedic Surgery, Hospital for Joint Diseases, New York, NY

[3] Department of Orthopedic Surgery, St. Vincent's Medical Center, New York, NY

来源：

European Spine Journal | 1997年 / 6卷 / 4期

关键词：

Laminar hooks; Pedicle screws; Spinal instrumentation; Torsional instability;

D O I：

10.1007/BF01322446

中图分类号：

学科分类号：

摘要：

Biomechanical studies have shown hooks to be superior to pedicle screws in pull-out, especially in osteoporosis. This study evaluates the possible increase in stiffness of pedicle screws provided by laminar hooks while applying non-destructive forces to a vertebrectomy model assembled with Compact Cotrel Dubousset (CCD) instrumentation. Synthetic vertebrae were employed in a three-level vertebrectomy model. CCD screw-based three-level constructs with and without sublaminar hooks in the caudal element were tested in flexion, extension, compression, lateral bending, and torsion. There was no statistically significant advantage in adding inferior laminar hooks to a caudal end vertebra that had bilateral pedicle screws in any of the testing modes. Torsional stability, however, was augmented, but not significantly. Torsional instability and osteoporotic bone may be the clinical justifications for adding laminar hooks below screws in the caudal end vertebra.

引用

页码：245 / 248

页数：3

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