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Vertebral osteomyelitis
1University of Southern California School of Medicine, Los Angeles.
Abstract:
Vertebral osteomyelitis can be caused by a variety of microorganisms. The hematogenous pyogenic form is characteristically a disease of people over age 50, predominantly in the male population, and most frequently caused by S. aureus. In IVDAs, however, younger patients and a heavier predominance of males are seen, and P. aeruginosa is one of the most commonly seen pathogens. The disease is generally monomicrobial, unless it is secondary to a contiguous process such as a pressure sore, in which polymicrobial infection with participation of anaerobes is the general rule. Lumbar, greater than thoracic, greater than cervical involvement is the rule in the general population, but cervical spine involvement is frequently seen more often than thoracic involvement in IVDAs. Diabetic patients are over-represented among patients with vertebral osteomyelitis, and they also have a tendency for higher morbidity and mortality. Simultaneous involvement of adjacent vertebral end plates and the intervening disk is the general rule. The vertebrae are generally involved, and the posterior elements of the spine are involved infrequently. Posterior element involvement is seen more commonly in actinomycosis, coccidioidomycosis, and neoplasms. Newer diagnostic modalities, such as CT, MRI, and radionuclide scans, may detect the disease earlier than conventional radiographs. Immunobilization by bed rest and appropriate antimicrobial therapy are generally sufficient in the therapy of pyogenic, as well as tuberculous, vertebral osteomyelitis. In selected circumstances, such as in the presence of marked instability of the spine, the presence of new neurologic deficits, or with progression of previous neurologic deficits, surgical intervention may be necessary. With prompt diagnosis and proper management, the prognosis should generally be good.
Insights
Vertebral osteomyelitis presents differently in various patient groups, with distinct pathogens and affected spinal regions. Prompt diagnosis and management, including imaging and antimicrobial therapy, are key to a good prognosis.
Area of Science:
- Infectious Diseases
- Orthopedic Surgery
- Radiology
Background:
- Vertebral osteomyelitis is a spinal infection with diverse etiologies and patient demographics.
- Hematogenous pyogenic osteomyelitis typically affects males over 50, often caused by S. aureus.
- Intravenous drug abusers (IVDAs) present with younger demographics, more males, and P. aeruginosa as a common pathogen.
Purpose of the Study:
- To review the epidemiology, microbiology, clinical presentation, diagnosis, and management of vertebral osteomyelitis.
- To highlight differences in disease patterns between the general population and specific groups like IVDAs and diabetics.
- To discuss the role of advanced imaging and treatment strategies.
Main Methods:
- Review of existing literature on vertebral osteomyelitis.
- Analysis of epidemiological data, causative agents, and clinical features.
- Discussion of diagnostic modalities and therapeutic approaches.
Main Results:
- Vertebral osteomyelitis etiology varies; S. aureus is common in older males, P. aeruginosa in younger IVDAs.
- Spinal region involvement differs: lumbar > thoracic > cervical in general, but cervical is more frequent in IVDAs.
- Diabetic patients show increased morbidity and mortality; posterior element involvement is rare except in specific conditions.
Conclusions:
- Vertebral osteomyelitis requires tailored diagnostic and therapeutic approaches based on patient factors and causative organisms.
- Advanced imaging like CT and MRI aids early detection.
- Conservative management with immobilization and antibiotics is often sufficient, but surgery may be needed for instability or neurological deficits.