Sonographic findings associated with complications in pediatric patients with septic arthritis.

Objectives: Ultrasound is a valuable tool for diagnosing septic arthritis and guiding the development of treatment plans. This study aimed to identify sonographic findings associated with complications in septic arthritis.

Methods: Twelve patients aged <5 years diagnosed with septic arthritis were classified into two groups: those with and without complications. Complications were defined as the destruction of the epiphyseal bone head and metaphysis bone cortex. The following sonographic findings were compared between the two groups using Fisher's exact test: synovial membrane thickness, joint effusion, diminished hyperechoic foci within the epiphyseal bone head, and diminished smooth metaphyseal bone cortex.

Results: Overall, 4 of 12 patients developed complications. Joint effusion and synovial membrane thickening were detected in all patients with septic arthritis. The incidence of diminished hyperechoic foci within the epiphyseal bone head was significantly different between the two groups (presence/absence in patients with complications vs. without = 3/1 vs. 0/8, p = 0.018). The incidence of diminished smooth metaphyseal bone cortex was higher in patients with complications than in those without; however, this difference was not statistically significant (presence/absence in patients with complications vs. without = 4/0 vs. 3/5, p = 0.081).

Conclusion: Ultrasound proved to be an effective diagnostic tool for septic arthritis and also demonstrated its potential in predicting complications of septic arthritis in the pediatric population.