This is used to assess any problems in the surrounding structures such as bone fractures, chondrocalcinosis, and inflammatory arthritis which may predispose to septic arthritis. While x-rays may not be helpful early in the diagnosis/treatment, they may show subtle increase in joint space and tissue swelling. Later findings include joint space narrowing due to destruction of the joint.Ultrasound is effective at detecting joint effusions.CT and MRI are not required for diagnosis; but if the diagnosis is unclear or the joints are hard to examine (ie.sacroiliac or hip joints); they can help to assess for inflammation/infection in or around the joint (i.e. Osteomyelitis), bone erosions, and bone marrow oedema. Both CT and MRI scans are helpful in guiding arthrocentesis of the joints. Differential diagnosis
Crystal induced arthritis such as gout or pseudogout
Inflammatory arthritisRheumatoid arthritis
Seronegative spondyloarthropathy such as ankylosing spondylitis or reactive arthritis
Traumatic arthritis due to hemarthrosis, fracture or foreign body
Osteoarthritis

Treatment
Treatment is usually with intravenous antibiotics, analgesia and washout and/or aspiration of the joint. Draining the pus from the joint is important and can be done either by needle (arthrocentesis) or opening the joint surgically (arthrotomy).Empiric antibiotics for suspected bacteria should be started. This should be based on Gram stain of the synovial fluid as well as other clinical findings.
Wilson–Mikity syndrome, a form of chronic lung disease (CLD) that exists only in premature infants, leads to progressive or immediate development of respiratory distress. This rare condition affects low birth babies and is characterized by rapid development of lung emphysema after birth, requiring prolonged ventilation and oxygen supplementation. It is closely related to bronchopulmonary dysplasia (BPD), differing mainly in the lack of prior ventilatory support. All the initial patients described with Wilson–Mikity syndrome were very low birth weight infants that had no history of mechanical ventilation, yet developed a syndrome that clinically resembled BPD. Upon the death of some of these infants, autopsies showed histologic changes similar to those seen in BPD.It was characterized by Miriam G. Wilson and Victor G. Mikity in 1960. Symptoms and signs
The onset of respiratory difficulty occurs at the first day of life and continues up to three weeks into the infants life, at which point treatment is needed for infant survival. Complications
Mothers who have developed chorioamnionitis during pregnancy put their infant at higher risk for development of Wilson-Mikity syndrome. It is a rare complication that requires prolonged treatment. Infection, however, is not shown to be an etiological factor, but a correlation to chorioamnionitis is identified as a risk. Cause
The cause of Wilson-Mikity syndrome is unknown. Diagnosis
The diagnosis of Wilson-Mikity syndrome can be made through two distinct symptoms: analogous characteristics of respiratory distress syndrome and presence of diffuse and streaky infiltrates with small cystic changes, seen through a chest X-ray.