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Copyright of Clinical Neuroscience / Ideggyógyászati Szemle is the property of LifeTime Media Kft. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Clinical Neuroscience / Ideggyógyászati Szemle is the property of LifeTime Media Kft. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Pelvic incidence (PI) and Jackson's angle are 2 major spinopelvic parameters that define the position of the sacrum within the pelvis. These parameters are measured on standing lateral radiography, and the identification of the hip axis is essential for measurements. Moreover, identifying the hip axis in patients with hip diseases or femoral head deformity is challenging. In this study, we described a novel parameter named posterior pubic incidence (PPI) that could be measured using the posterior pubic edge instead of the hip axis. Group A comprised 50 volunteers who underwent standing lateral lumbosacral radiography. Group B comprised 54 patients with abdominal or urologic problems who underwent supine computed tomography. The PI, pelvic tilt (PT), sacral slope, PPI, and posterior pubic tilt were measured. The differences between PI and PPI were evaluated. Linear regression analysis was used to predict the PI value from PPI. The mean PI and PPI values were 47.41° ± 12.32° and 49.32° ± 11.94° in group A and 49.19° ± 9.99° and 49.99° ± 9.25° in group B, respectively. The mean absolute differences in groups A and B were 2.41° ± 1.63° and 1.9° ± 1.62°, respectively. High correlations were obtained between PI/PPI and pelvic tilt/posterior pubic tilt. PI could be calculated as PI° = PPI° − 2° on plain radiography and as PI° = PPI° − 1° on computed tomography. PPI was strongly correlated with PI, which was nearly equal to PI, and may replace PI in formulas containing PI. [ABSTRACT FROM AUTHOR]

A letter to the editor is presented which discusses the association between subcutaneous lipoma and pericallosal lipoma in an adult patient.

Background: This study aimed to measure pelvic incidence (PI) and other spinopelvic sagittal parameters on supine computed tomography (CT) and to assess the validity and reliability of measurements from supine CT images when compared with standing x-ray images. Difficulties in superimposition of femur heads and obtaining the perfect midsagittal view of the sacral endplate may cause relatively low intra- and interobserver agreements. Some authors reported that PI values measured by CT had higher reliability, but both validity and reliability of CT measurement of spinopelvic parameters compared with standing x-ray imaging methods have not been reported previously., Methods: PI, pelvic tilt (PT), and sacral slope (SS) were measured on standing lateral x-ray and spinopelvic supine CT images of 33 asymptomatic volunteers., Results: The mean PI, PT, and SS in standing x-ray images were 45.2°, 10°, and 35.3°, respectively, whereas those in supine CT images were 44.5°, 8.2°, and 36.2°, respectively. No significant differences were found in each parameter. Excellent correlations were found between each parameter obtained from x-ray and CT images. Intra- and interobserver reliabilities were excellent in both x-ray and CT image measurements, although those from CT images were higher., Conclusion: Spinopelvic sagittal parameters could be measured on supine CT by using a simple method with high reliability and validity; thus, CT could be a good alternative to standing x-ray imaging. In the supine position, PI does not change but PT decreases by a small amount and SS increases almost by the same amount because of the mathematical relationship between PT and SS (PI = PT + SS)., Clinical Relevance: Supine CT is an efficient diagnostic tool for the reliable extraction of spinopelvic sagittal parameters., Competing Interests: Declaration of Conflicting Interests: The authors report no conflicts of interest in this work., (This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery. Copyright © 2022 ISASS. To see more or order reprints or permissions, see http://ijssurgery.com.)