Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (43): 8063-8067.doi: 10.3969/j.issn.1673-8225.2011.43.021

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Anatomic characteristics of thoracic pedicle-rib complex for internal fixation

Xing Wen-hua1, Jia Lian-shun1, Huo Hong-jun2, Yang Xue-jun2   

  1. 1Department of Orthopedics, Changzheng Hospital, Second Military Medical University, Shanghai  200003, China
    2Department of Spinal Surgery, Second Affiliated Hospital of Inner Mongolia Medical College, Hohhot  010030, Inner Mongolia Autonomous Region, China
  • Received:2011-04-20 Revised:2011-06-20 Online:2011-10-22 Published:2011-10-22
  • About author:Xing Wen-hua☆, Studying for doctorate, Attending physician, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China xwhspine@sohu.com

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Abstract:

BACKGROUND: The surrounding structures of the thoracic vertebra are complicated, and the thoracic pedicle is thinner than lumbar pedicle anatomically, particularly in some cases of scoliosis or other spine deformity, resulting in impossible implantation of pedicle screws or post-implantation injury. Therefore, the safety and efficacy of pedicle screw fixation cannot be guaranteed.
OBJECTIVE: To study the applied anatomy of the pedicle-rib complex and to perform the biomechanical test for screw insertion through the pedicle-rib complex in the thoracic spine.
METHODS: Six specimens of adult cadaveric thoracic spine (T1-12) were used to observe modality of pedicle and pedicle-rib complex. The following parameters were measured: pedicle width (P-W), pedicle height (P-H), pedicle length (P-L), pedicle transverse angle (P-TA), pedicle sagittal angle (PSA), pedicle-rib complex transverse distance (PRC-W), longitudinal distance (PRC-H), screw length (PRC-L), angle in transverse plane (PRC-TA) and angle in sagittal plane (PRC-SA).
RESULTS AND CONCLUSION: The measurement results of the above-mentioned parameters were as follows: PRC-W: 13.0-17.3 mm, PRC-H: 5.8-8.0 mm, PRC-L: 43.4-60.5 mm, PRC-TA: 15.4°-36.7°, PRC-SA: 76.2°-85.4°. Screw implantation through the pedicle-rib complex in the thoracic spine is safer and has better mechanical stability than that of pedicle screw. The former one may be just regarded as a supplementary of the latter in some instance that the transversal width of thoracic pedicle is too small to implant screw.

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