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Study Design:

Prospective study.

Objective:

To analyze sagittal spinopelvic parameters in ankylosing spondylitis (AS) patients.

Summary of Background Data:

There are little data on the relationship between the sagittal spinopelvic parameters and AS.

Methods:

The study and control groups comprised 90 AS patients and 40 controls. Participants were classified into 3 groups: normal (n= 40), sagittal balance (n= 58), and sagittal imbalance (n= 32) groups. All underwent lateral radiograph of the whole spine including hip joints. The radiographic parameters were sacral slope, pelvic tilting, pelvic incidence, overhang of S1, thoracic kyphosis, lumbar lordosis, and C7 plumbline. Statistical analysis was performed to identify significant differences between the 2 groups. Correlations between radiological parameters and symptoms were sought.

Results:

AS patients and controls were found to be significantly different in terms of …