What are the best diagnostic tests for diagnosing bacterial arthritis of a native joint?

Aims This study aimed to answer two questions: what are the best diagnostic methods for diagnosing bacterial arthritis of a native joint?; and what are the most commonly used definitions for bacterial arthritis of a native joint? Methods We performed a search of PubMed, Embase, and Cochrane libraries for relevant studies published between January 1980 and April 2020. Of 3,209 identified studies, we included 27 after full screening. Sensitivity, specificity, area under the curve, and Youden index of diagnostic tests were extracted from included studies. We grouped test characteristics per diagnostic modality. We extracted the definitions used to establish a definitive diagnosis of bacterial arthritis of a native joint per study. Results Overall, 28 unique diagnostic tests for diagnosing bacterial arthritis of a native joint were identified. The following five tests were deemed most useful: serum ESR (sensitivity: 34% to 100%, specificity: 23% to 93%), serum CRP (sensitivity: 58% to 100%, specificity: 0% to 96%), serum procalcitonin (sensitivity: 0% to 100%, specificity: 68% to 100%), the proportion of synovial polymorphonuclear cells (sensitivity: 42% to 100%, specificity: 54% to 94%), and the gram stain of synovial fluid (sensitivity: 27% to 81%, specificity: 99% to 100%). Conclusion Diagnostic methods with relatively high sensitivities, such as serum CRP, ESR, and synovial polymorphonuclear cells, are useful for screening. Diagnostic methods with a relatively high specificity, such as serum procalcitonin and synovial fluid gram stain, are useful for establishing a diagnosis of bacterial arthritis. This review helps to interpret the value of various diagnostic tests for diagnosing bacterial arthritis of a native joint in clinical practice. Cite this article: Bone Joint J 2021;103-B(12):1745–1753.

Management of Septic Arthritis in Emergency Department

Bacterial arthritis is an inflammation of the joints caused by an infectious etiology, usually bacterial, but there are also fungi, mycobacteria, viruses, or other rare pathogens. Both healthy and predisposed people can be infected. Nongonococcal infectious arthritis, usually a monoarticular disease, affects multiple joints in about 10% of patients and is a new form of septic arthritis. Without treatment, it can progress rapidly and cause irreversible damage to the joints. The overall incidence of bacterial arthritis is 2 to 6 per 100,000, depending on the presence of risk factors. Bacterial arthritis is more common in children than in adults. The incidence of septic arthritis peaks between the ages of 2 and 3 and is predominantly male (2: 1). Most septic joints develop as a result of hematogenous dissemination of the vascular synovium due to bacterial episodes. Osteoarthritis, rheumatoid arthritis, and corticosteroid therapy are the most common predisposing conditions. Typical symptoms of acute septic arthritis without gonorrhea include recent fever, malaise, and local findings of pain, warmth, swelling, and restricted mobility of the affected joint. Accurate history and assessment of risk factors can provide important clues for diagnosis. Careful assessment of risk factors can significantly change the likelihood of a provider developing septic arthritis prior to testing. Laboratory findings, diagnostic imaging, and synovial fluid assessment are all useful for diagnosis. Management components include early detection and treatment with joint aspiration, antibiotics, and orthopedic advice for possible surgical management. Widespread antibiotics are often needed due to the potential for rapid joint destruction. A combination of cefepime or anti-Pseudomonas aeruginosa beta-lactams and vancomycin is recommended to cover both Gram-negative and MRSA bacteria.

Bacterial arthritis of native joints can be successfully managed with needle arthroscopy

Purpose To assess the feasibility of needle arthroscopy for management of suspected bacterial arthritis in native joints. Methods During a pilot period, patients presenting with symptoms suggestive of native joint bacterial arthritis were eligible for initial management with needle arthroscopy. Procedures were performed in the operating theatre or at the patient bedside in the emergency department or inpatient ward. As our primary outcome measure, it was assessed whether needle arthroscopic lavage resulted in a clear joint. In addition, the need for conversion to standard arthroscopy or arthrotomy, the need for conversion from local to general anaesthesia, complications and the need for additional surgical intervention at follow-up during admission were recorded. Results Eleven joints in 10 patients (four males, age range 35 – 77) were managed with needle arthroscopy. Needle arthroscopic lavage resulted in a clear joint in all cases. Conversion to standard arthroscopy or arthrotomy was not needed. Seven procedures were performed at the patient bedside using local anaesthesia. These procedures were well tolerated and conversion to general or spinal anaesthesia was not required. There were no procedure complications. One patient received multiple needle arthroscopic lavages. No further surgical interventions beside the initial needle arthroscopic lavage were required for successful management in other cases. Conclusions Needle arthroscopy can be a feasible tool in the initial management of complaints suggestive for native joint bacterial arthritis, providing an effective, quick and well-tolerable intervention in the operating theatre or at the patient bedside, with the potential to relief health systems from need for scarce operating theatre time.

Paediatric case of group A streptococcal pharyngitis, arthritis and osteomyelitis associated with dental neglect

Group A streptococcus (GAS) causes a wide variety of infections in the paediatric population, ranging from pharyngitis to rare but severe invasive diseases, such as bacterial arthritis and osteomyelitis. Dental neglect is a type of child neglect in which caregivers fail to provide adequate care and treatment for dental diseases. This results in poor oral hygiene and can lead to complications including sepsis. We report the case of a 4-year-old boy, suffering from child neglect, presenting with GAS pharyngitis and subsequent bacterial arthritis in the right ankle, osteomyelitis in the right talus and abscess in the right calcaneus. He was first treated with penicillin, which was changed to clindamycin because of a suspected drug-induced rash. He was discharged after 6 weeks of intravenous therapy when symptoms had resolved and inflammatory markers were within the normal range. The case highlights that dental neglect may present a risk for subsequent invasive infections.