M45.A5

Clinical Causes: Genetic factors, such as the presence of HLA-B27 gene Environmental triggers that may activate the immune system Altered immune response leading to chronic inflammation Family history of spondyloarthritis or related autoimmune conditions

Key Symptoms: Persistent lower back pain and stiffness, especially in the morning or after periods of inactivity Pain that improves with exercise but not with rest Gradual onset of back discomfort that lasts for more than three months Limited range of motion in the thoracic and lumbar spine Fatigue and general feeling of being unwell Possible inflammation of the tendons and ligaments connecting to the spine (enthesitis) Occasional mild joint pain outside the spine

Diagnosis Path: Diagnosis involves a combination of clinical assessment, imaging studies, and laboratory tests. Since nr-axSpA does not show changes on standard X-rays, MRI scans are crucial for detecting inflammation in the sacroiliac joints and spinal regions. Blood tests may reveal markers of inflammation, such as elevated C-reactive protein (CRP), and for genetic predisposition, testing for HLA-B27 may be performed. A thorough medical history and physical examination help differentiate nr-axSpA from other causes of back pain.

Treatment Protocols: Non-steroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation and alleviate pain Physical therapy and regular exercise to maintain flexibility and strengthen supporting muscles Biologic medications, such as tumor necrosis factor (TNF) inhibitors, for cases resistant to initial therapies Lifestyle modifications, including posture improvement and ergonomic adjustments Regular monitoring to assess disease activity and response to treatment Patient education about the chronic nature of the condition and self-management techniques