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Standing lateral radiograph and CT of sacroiliac joint. a AS patient with thoracolumbar kyphosis (GK: 77°). b Non-deformity patient with AS. c Sagittal deformity patients without AS (posttraumatic kyphotic deformity in thoracolumbar spine). d-e CT scans have shown bony fusion in sacroiliac joints of the deformity patient with AS, also the non-deformity patient with AS. f No erosion or ankylosis was found in sacroiliac joints of sagittal deformity patients without AS
