SIB #254 Relationship Between T1 Sagittal Angle and Sagittal Balance
The Study: The Relationship between T1 Sagittal Angle and Sagittal Balance: A Retrospective Study of 119 Healthy Volunteers.
a. The authors indicate that prior studies have not explored how the T1 lateral sagittal angle affects sagittal balance.
b. They also note that the T1 lateral sagittal angle has been "used as a parameter for assessing sagittal balance and cervical lordosis."
c. They looked at full-spine lateral radiographs.
d. The authors determined that the T1 lateral sagittal angle was "a useful parameter for sagittal balance" but that it could not replace the sagittal vertical axis.
e. The factor that most influenced the T1 lateral sagittal angle was the maximum thoracic kyphosis.
f. The authors developed a formula for this study and stated, "According to the equation, we could restore sagittal balance by surgically changing thoracic kyphosis and lumbar lordosis, which could serve as a guideline for oseotomy."
The T1 lateral sagittal angle was useful when considering the lateral sagittal balance of the spine. In addition, the equation developed by the authors might be useful in deciding how surgically changing the thoracic kyphosis and lumbar lordosis could improve sagittal balance.
Once again this article shows that the medical profession (three of the authors were from a medical university and one from a department of Orthopedic Oncology) is interested in spinal alignment and are using full spine radiography in their studies. In addition they are proposing an equation to aid in making decisions on alignment that might be changed by surgical intervention. You know, I don't think the medical profession is of the mind that the doctor of chiropractic is needed when trying to correct spinal misalignments. I hope that you are passing these articles on to your friends and that together you are discussing these issues and coming to your own conclusions.
Reviewer: Roger Coleman DC
Editor’s Comments: We’ve all seen extreme cases of thoracic kyphosis that might possibly benefit from surgical intervention, so it might be easy to assume that’s the basis for this type of medical paper. In light of the fact that these posture papers continue to come out of the medical professions, I highly doubt that to be the case. Eventually papers like these are more likely to become the research base which supports surgical interventions for symptomatic patients with much milder alterations of posture…the very patients you see every day.
Editor: Mark R. Payne DC
Reference: Yang M, Yang C, Ni H, Zhao Y, Li M. The Relationship between T1 Sagittal Angle and Sagittal Balance: A Retrospective Study of 119 Healthy Volunteers. PLoS One 2016 Aug 11;11(8):e0160957. doi: 10.1371/journal.pone.0160957. eCollection 2016.
Link to Abstract: https://www.ncbi.nlm.nih.gov/pubmed/27513865