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Septic arthritis is a destructive arthropathy caused by an intra-articular infection that usually is related to severe symptoms such as pain and decreased range of motion. This condition requires prompt treatment aiming to avoid permanent damage to joint, which may result in chronic deformity or mechanical arthritis.
The diagnosis of joint sepsis is often considered straightforward. Patients often present with a painful joint, fever, and purulent synovial fluid.
Risk factors for septic arthritis include bacteremia, advanced age, an immunocompromised state, rheumatoid arthritis, intra-articular injections, and prosthetic joints.
In the absence of trauma or recent instrumentation of the joint, septic arthritis is usually secondary to haematogenous seeding. S aureus is the most commonly isolated agent (31.3% of casesref).
Large joints with abundant blood supply to the metaphyses are most prone to bacterial infection, with the most commonly affected joints theoretically being the shoulder, hip, and knee.
Imaging generally plays an adjunct role to arthrocentesis in the diagnosis of joint sepsis. If synovial fluid cannot be retrieved, however, radiologic studies become of the utmost importance.
The treatment principals for septic arthritis is drainage and appropriate antibiotics.
If the patient is heamodynamically stable then attempts should be made to obtain a sample of joint fluid for microscopy and culture prior to starting treatment with antibiotics. This will allow focused treatment of the infection4.
With smaller joints needle drainage or aspiration to decompress the joint followed by antibiotics may be adequate. For larger joints or persistent infection surgical debridement and washout will be required4.
If unrecognised and left untreated, septic arthritis can result in irreversible joint damage within 48 hours of the onset of infection due to the proteolytic enzymes of the white blood cells that flood the infected synovial space. Osteonecrosis is also an important sequela of septic arthritis due to effusion and increase in intra-articular pressure compromises blood circulation.
Conversely, approximately 90% of patients with septic arthritis will recover with appropriate antibiotic treatment. Therefore, timely diagnosis and treatment are critical.
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