Faculty Collaboration Database

Kinematics of the lumbar spine following pedicle screw plate fixation. Spine (Phila Pa 1976) 1993 Mar 15;18(4):504-12

Date

03/15/1993

Pubmed ID

8470013

DOI

10.1097/00007632-199318040-00015

Scopus ID

2-s2.0-0027531589 (requires institutional sign-in at Scopus site)   48 Citations

Abstract

This investigation was conducted to determine the kinematic response of the lumbar spine instrumented with transpedicular screws and plates. Seven unembalmed human cadaveric lumbar spines were used. Retroreflective targets were inserted into the bony landmarks of each vertebral body, facet column, and spinous process. The specimen was quasistatically loaded until failure (initial cycle) using an electrohydraulic testing device at a rate of 2.5 mm/sec. After radiography, the specimen was again loaded (injury cycle) to the failure compression determined in the previous cycle. Transpedicular screws then were inserted bilaterally at one level proximal and distal to injury. The stabilized cycle of loading was conducted using the procedure adopted in the injury cycle. Comparative analysis of the localized kinematic data between the stabilized and injured columns indicated a reduction in motion between fixated levels, increasing the rigidity of the column. At levels proximal and distal to fixation, however, motion increased, indicating added flexibility. These alterations in the motion, observed during single-cycle loading, may be further accentuated in vivo, leading to hypermobility and degeneration of the spine.

Author List

Yoganandan N, Pintar F, Maiman DJ, Reinartz J, Sances A Jr, Larson SJ, Cusick JF

Authors

Joseph F. Cusick MD Adjunct Professor in the Neurosurgery department at Medical College of Wisconsin
Frank A. Pintar PhD Chair, Professor in the Biomedical Engineering department at Medical College of Wisconsin
Narayan Yoganandan PhD Professor in the Neurosurgery department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adult
Aged
Biomechanical Phenomena
Bone Plates
Bone Screws
Cadaver
Humans
Medical Illustration
Middle Aged
Motion
Postoperative Period
Radiography
Spinal Fractures
Spine