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Lumbosacral Vertebral Angles can Predict Lumbosacral Transitional Vertebrae on Routine Sagittal MRI.
Farrokh Seilanian Toosi1, Bahare Mahdianfar1, Ahmadreza Zarifian1,2
1Department of Radiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
The Archives of Bone and Joint Surgery
|July 9, 2025
Summary
Measuring lumbosacral vertebral angles on MRI can help identify lumbosacral transitional vertebrae (LSTV). Specific angles like the delta-angle show high accuracy in diagnosing LSTV, aiding early detection.
Area of Science:
- Radiology
- Orthopedics
- Anatomy
Background:
- Lumbosacral transitional vertebrae (LSTV) are common anatomical variations.
- Accurate identification of LSTV is crucial for clinical management and surgical planning.
Purpose of the Study:
- To measure lumbosacral vertebral angles in routine lumbar sagittal MRIs.
- To assess the association between these angles and the presence of LSTV.
Main Methods:
- 220 patients undergoing lumbar MRI were analyzed.
- Five vertebral angles (A, B, C, D, delta) and disc dehydration at L4-L5 and L5-S1 were measured.
- Statistical analysis was performed to identify associations with LSTV.
Main Results:
- 16.36% of participants had LSTV.
- Dehydrated L4-L5 discs, non-dehydrated L5-S1 discs, increased A-angle, and decreased D-angle independently predicted LSTV.
- Specific angle cutoffs (C-angle ≤ 35.5°, delta angle ≤ 8.5°) showed diagnostic potential for LSTV and type 2 LSTV.
Conclusions:
- Lumbosacral vertebral angles, particularly the delta-angle, measured on sagittal MRI can aid in diagnosing LSTV.
- These measurements may serve as a valuable tool for alerting physicians to potential LSTV.
