Bacterial Osteomyelitis or Nonbacterial Osteitis in Children: A Study Involving the German Surveillance Unit for Rare Diseases in Childhood.

BACKGROUND: Although bacterial osteomyelitis (BO) is a commonly recognized diagnosis in pediatrics, it is often difficult to distinguish from nonbacterial osteitis (NBO). The goal of our study was to distinguish between the two disease entities and better define NBO.

METHOD: Using the German Surveillance Unit for Rare Diseases in Childhood (Erhebungseinheit für Seltene Paediatrische Erkrankungen (ESPED) in Deutschland) this prospective study during a 5 five year period captured 657 patients at first diagnosis of either BO (n=378) or NBO (n=279) while analyzing epidemiologic, clinical and radiologic data.

RESULTS: BO was reported in 1.2 per 100,000 children with a higher prevalence in younger male patients (58%), and NBO was reported in 0.45 per 100,000 children. BO patients tended to present with fevers (68%), elevated inflammation markers (82%) and local swelling (62%) but a shorter course of symptoms than NBO patients. NBO patients presented in good general health (86%) and were more likely to have multifocal lesions (66%). S. aureus was the most prominent pathogen (83%), with only one MRSA reported. Complications ranged from arthritis adjacent to the lesion to hyperostosis and vertebral fractures.

CONCLUSION: BO and NBO can be distinguished based on symptoms, associated diseases and inflammation markers. NBO should always be considered in pediatric patients presenting with bone lesions and pain, especially in young female patients presenting with good general health, minimal inflammation markers, and multifocal lesions in the vertebrae, clavicle and sternum.