The document discusses seronegative spondyloarthropathies, a group of disorders that share clinical features like inflammatory axial arthritis and enthesitis. It focuses on ankylosing spondylitis (AS), describing its pathology, clinical manifestations including stiffness and fusion of the spine, extra-articular involvement like uveitis, and treatments including NSAIDs and TNF inhibitors. Surgical treatments for severe AS spinal deformities like osteotomies and joint replacement are also summarized.