70-year-old patient. PI = 41°, so ideal Roussouly-type is 1. Ideal

Restoring the ideal Roussouly sagittal profile in adult scoliosis surgery decreases the risk of mechanical complications

Exercise 8.4 A sample from a 70-year-old Caucasian

Restoration of the sagittal profile according to the Roussouly classification reduces mechanical complications and revision surgery in older patients undergoing surgery for adult spinal deformity (ASD)

Frontiers Roussouly type 2 could evolve into type 1 shape as sagittal spinal alignment deterioration progresses with age

Sagittal balance of the spine - ScienceDirect

Practicing Chiropractors' Committee on Radiology Protocols (PCCRP)

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The importance of sagittal balance in adult scoliosis surgery. - Abstract - Europe PMC

Sagittal Balance and Preoperative Planning

DECISION MAKING FOR SURGERY IN ADULT SCOLIOSIS REVIEW OF THE CURRENT LITERATURE. - Document - Gale Academic OneFile

Frontiers Correlation Between Different Sagittal Parameters in Patients With Degenerative Kyphosis

Age-based normal sagittal alignment in Chinese asymptomatic adults: establishment of the relationships between pelvic incidence and other parameters