Biomechanical effects of pedicle screw fixation on adjacent segments

Various biomechanical investigations have attempted to clarify the aetiology of adjacent segment disease (ASD). However, no biomechanical study has examined in detail the deformation behaviour of the adjacent segments when both pure torque and an angular displacement load are applied to the vertebra...

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Bibliographic Details
Published in:European journal of orthopaedic surgery & traumatology 2014-07, Vol.24 (Suppl 1), p.283-287
Main Authors: Kyaw, Thein Aung, Wang, Zhuo, Sakakibara, Toshihiko, Yoshikawa, Takamasa, Inaba, Tadashi, Kasai, Yuichi
Format: Article
Language:English
Subjects:
Animals
Biomechanical Phenomena - physiology
Biomechanics
Lumbar Vertebrae - physiology
Male
Medicine
Medicine & Public Health
Models, Biological
Original Article
Pedicle Screws
Range of Motion, Articular - physiology
Rotation
Spinal Fusion
Stress, Mechanical
Surgical Orthopedics
Sus scrofa
Swine
Traumatic Surgery
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Summary:Various biomechanical investigations have attempted to clarify the aetiology of adjacent segment disease (ASD). However, no biomechanical study has examined in detail the deformation behaviour of the adjacent segments when both pure torque and an angular displacement load are applied to the vertebrae along multiple segments. The purpose of this study is to investigate the biomechanical effects of pedicle screw fixation on adjacent segments. Ten cadaveric lumbar spines (L2–L5) of boars were used. Control and fusion models were prepared by disc damage and pedicle screw fixation of each specimen, and then, bending and rotation tests were performed using a six-axis material tester. In the biomechanical tests regulated by an angular displacement load, the range of motion (ROM) of the cranial and caudal adjacent segments in antero-posterior flexion and lateral bending was increased by about 20 % ( p  
ISSN:1633-8065
1432-1068
DOI:10.1007/s00590-014-1416-1