Spinal involvement starts at the thoracolumbar spine and finally involves whole spine Leads to progressive kyphosis of thoracic spine and loss of lordosis of cervical and lumbar spines and compensatory flexion deformity of hips and knees Costovertebral joints affected which leads to restrictive lung capacities Sacroiliitis occurs early in the course of ankylosing spondylitis and is regarded as a hallmark…
