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SUGINO, R. L. Morphometric study of the thoracic spine: Relationship of the cervicothoracic junction with the sternum. 2016. 65 l. Dissertation (Master) – School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 2016. The cervicothoracic transition comprises the anatomical region including the distal cervical and proximal thoracic vertebrae. While conducting anterior surgical approaches for treatment of conditions that affect the vertebrae in this region, the sternum may represent a mechanical barrier. Thus, various methods of preoperative programming have been proposed to assess the need for osteotomies of the sternum. To date, there are no studies correlating the measures with gender and age. Our study involved a retrospective review of 300 CT examinations. Patients were separated according to gender into two groups and according to age into 3 subgroups. The studied parameters were: horizontal level in relation to the sternum (LHS), vertebral body angle (VA), disc level (DL) and angulation of the disc level (ADL). The LHS ranged from C7 to T4, and T2 was the most frequent (34.3%). The less frequent LHS were T4 (0.3%) and C7 (1%). The AC and ADL showed an average of 18,51 o and 19,63 o respectively. The VA varied 1,29 o the 54,32 o , while the ADL varied from 0 o to 49 o . DL ranged from C5-C6 to T2-T3, being C7-T1 the most frequent (46%). The less frequent DL found were T2-T3 (1.7%) and C5-C6 (3%). Compared the ADL between male and female groups, we found statistically significant difference (p = 0.003), being higher in the male group. There was a statistically significant difference when compared the values of ADL between the groups (p = 0.01). Regarding VA, we found statistically significant differences between male and female groups (p = 0.02), being higher in the male group. Comparison of VA between groups of different age showed a statistically significant difference (p = 0.001). There was no difference when comparing the results of the LHS between male and female groups (p = 0.3), or comparing LHS values between the different age groups (p = 0.79). The DL and LHS in our sample of the population has lower values compared to other population samples. DL differ between age groups, and the older the group, the lower were the figures. Our results show that the most distal disc level accessible from an anterior approach to the cervicothoracic region of the spine, with no theoretical need for a sternal osteotomy, present lower values when compared to previously reported data assigned to other populations. In other words, this finding can be translated as if the enrolled patients presented fewer vertebrae that can be addressed through anterior surgical procedure without performing sternal osteotomy. Thus, the same thought can be applied to the horizontal level in relation to the sternum, since our results showed more cranial values compared to results of previous studies. In addition, the disc level was different when comparing patients of different age groups, and the higher the age, the lower were the values found. This finding represents a migration to the more distal cranial disc level, as we increase the age of the patients.

Estudo morfométrico da coluna vertebral torácica: relação da transição cervicotorácica com o esterno