AOSpine Sacral Classification
Classifies a sacral fracture on CT by the AOSpine sacral system, with its neurologic and case-specific modifiers.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Where the fracture runs
- Unilateral vertical fracture…
- Type B fracture line
- Transforaminal: involves the foramina but not the spinal canal
- Neurologic status
- N2: lasting nerve-root injury (usually L5 or S1)
Result: AOSpine sacral B3 N2: posterior pelvic injury, a transforaminal fracture involving the foramina but not the spinal canal.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Where the fracture runs
- Type A pattern (read only for type A)
- Type B fracture line (read only for type B)
- Type C pattern (read only for type C)
- Neurologic status
- M1: substantial soft tissue injury
- M2: metabolic bone disease
- M3: anterior pelvic-ring injury
- M4: sacroiliac joint injury
How this is calculated
Citation
Vaccaro AR, et al. Description and Reliability of the AOSpine Sacral Classification System. J Bone Joint Surg Am. 2020;102(16):1454-1463. Camino-Willhuber G, Urrutia J. Clin Orthop Relat Res. 2022;480(11):2182-2186. Read the sources: Vaccaro 2020 ↗, Camino-Willhuber 2022 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.