• Spine · Jun 2010

    Internal morphometry of thoracic pedicles in the immature spine.

    • Eskandar Hassan, Kai-Ming Liau, Irwan Ariffin, and Abdul Halim Yusof.
    • Department of Orthopaedic Surgery, Spine Unit, School of Medical Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia.
    • Spine. 2010 Jun 1;35(13):1253-6.

    Study DesignA cross sectional study of thoracic pedicle morphometry in the immature spine of Malaysian population using reformatted computed tomographic (CT) images.ObjectiveTo quantify the isthmus endosteal width and height in the thoracic pedicle of the immature spine.Summary Of Background DataPrevious studies of thoracic pedicle morphology in the adults showed that pedicle screw fixation in the thoracic spine has a higher risk of spinal cord and segmental vessel injury because of the smaller pedicle diameter. Anatomic study of the thoracic pedicle morphology in the immature spine is lacking. Thus, the safety and feasibility of transpedicular fixation in the immature spine are still questionable.MethodsT1-T12 vertebral pedicles were studied in 25 Malay ethnic patients (age range, 4-18 years). Measurements of the isthmus endosteal width and isthmus endosteal height were made on reformatted CT images using linear measurement tools of Workstation software with a precision of 0.1 mm. The data collected were analyzed using SPSS software version 12.0. The patients were grouped into 3 age groups; group 1 (4-9 years), group 2 (10-14 years), and group 3 (15-18 years). Statistical differences between the age groups were analyzed using analysis of variance (ANOVA) test.ResultsIn group 1, none of the pedicles have an isthmus endosteal width exceeding 3.0 mm. In group 2, >50% of the pedicles from T1-T11 have an endosteal width of less than 3.0 mm. In group 3, >50% of the pedicles from T1-T10 have an endosteal width of less than 3.0 mm.ConclusionThe isthmus endosteal width in >50% of the pedicles studied were less than 3.0 mm. We conclude that transpedicular fixation in the thoracic spine using pedicle screw of >3.0 mm diameter is not feasible in children and adolescents of <18 years old in our population.

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