Özet:

In adolescent idiopathic scoliosis surgery (AIS) thorough knowledge of the morphometry of scoliotic vertebrae is important for safe pedicle screw instrumentation and deformity correction. This study aimed to evaluate the morphometry of each vertebrae in AIS patients based on chord length (CL), transverse pedicle width (TPW) and transverse pedicle angle (TPA). Preoperative thoracolumbar computerized tomography (CT) images of 81 AIS patients that were retrospectively evaluated. Mean age of the patients was 15.1 years, 64 of them were female and 17 were male. CL, TPW and TPA measurements were performed for concave and convex pedicles at all thoracic and lumbar levels. Values of concave and convex sides were compared. CL was shortest at T1 and longest at L5. CL values on the concave side were higher than those on the convex side with significant difference at T9 and L3 levels (p<0.05). Consistently smaller TPW values were observed on the concave side, however significant difference was only found at T8 and T9 levels (p<0.05). Narrowest pedicles were observed at T5. Highest and lowest values of TPA were observed at T1 and T12 levels respectively. Values were higher on the concave side with significant difference at T7, T8 and L3 levels (p<0.05). Concave pedicles are generally longer, thinner and more medially inclined in transverse plane. These findigs are distinct in the apical region but may show variability among patients. Routine preoperative CT examination can give important information about the individual bone structure of each patient.

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