**7. Intraoperative assessment of correction**

Fluoroscopy can be used to measure the focal correction during surgery after performing an osteotomy procedure. Next a 36 inch X-ray cassette that captures the entire fusion construct is recommended. The in-construct measurement appropriate for the patient's instrumentation can be measured (for example, C2-T10 SA for a posterior fusion from C2 to T10) (see **Figure 4**).

#### **Figure 4.**

*The in-construct measurement appropriate for the patient's instrumentation can be measured during surgery (for example: C2-T10 SA for a posterior fusion from C2 to T10).*
