T1 Slope and Cervical Sagittal Alignment on Cervical CT Radiographs of Asymptomatic Persons

Abstract

ObjectiveWe performed a retrospective analysis of medical records and radiographic images of patients who never underwent spinal treatment including diagnosis. The objective of this study is to explain the biomechanical and physiologic characteristics of cervical alignment related to thoracic inlet angle including T1 slope changes in each individual.MethodsWe reviewed the cervical CT radiographs of 80 patients who visited ENT outpatient clinic without any symptom, diagnosis and treatment of cervical spine from January 2011 to September 2012. All targeted people were randomized without any prejudice. We assessed the data-T1 slope, Cobb's angle C2-7, neck tilt, sagittal vertical axis (SVA) C2-7 and thoracic inlet angle by the CT radiographs.ResultsThe relationships between each value were analyzed and we concluded that Cobb's angle C2-7 gets higher as the T1 slope gets higher, while the SVA C2-7 value decreases.ConclusionWe propose that the T1 slope is background information in deciding how much angle can be made in the cervical spinal angle of surgical lordotic curvature, especially severe cervical deformity.

Influence of cervical spine position on the radiographic parameters of the thoracic inlet alignment

“…TIA was revealed to be comparable on lateral neutral radiographs with CT scans, whereas T1 slope and cervical lordosis were impaired by supine position [12]. TIA measured on CT scans in supine position is reported to correlate with T1 slope, NT and, with cervical lordosis [12,13]. Further clinical studies on implications of thoracic inlet parameters are needed.…”

Improvements in spinal alignment after high tibial osteotomy in patients with medial compartment knee osteoarthritis

“…The SPT values were 11 AE 58 in this study, 12.0 AE 6.58 [12], 13.0 AE 6.88 [14], 13.2 AE 6.18 [21], 11.5 AE 5.38 [22], 11.2 AE 7.88 [23], and 11.8 AE 4.48 [24]. The SVA values were 1.3 AE 2.0 cm in this study, À1.9 AE 1.9 cm [24], and 4.7 AE 7.1 cm [25]. Variability in CL measurement was relatively high in this study compared to previous studies:…”

“…The CL values were 34 AE 278 in this study, 12.1 AE 10.08 [24], 12.5 AE 7.88 [25], and 13.9 AE 12.38 [26].…”

“…The spinal alignment parameters in the sagittal plane for healthy subjects during standing. The white bar represents the mean and standard deviation of previous studies [12,14,[21][22][23][24][25][26], and the black bar represents the mean and standard deviation of the current study for each sagittal spinal parameters. above 208 is associated with restriction of effective ambulation and poorer health-related quality of life in adult patient with deformity [13,28].…”

Dimensions of the cervical neural foramen in conditions of spinal deformity: an ex vivo biomechanical investigation using specimen-specific CT imaging

“…These patients will frequently have co-existing symptoms of nerve root compression. While radiographic measurements of cervical deformity, C2-C7 SVA and T1 tilt, have been shown in recent retrospective studies to correlate with clinical outcome scores [3,5,17], the impact of these variables on the anatomy of the neural foramen remains unknown. It is important to understand how the neural foramen change in deformity as this will help us identify anatomical drivers of a patient's symptoms, informing both our understanding of prognosis and treatment [18][19][20].…”