Spinal Osteomyelitis (Vertebral Infection)
Bacterial infection of one or more vertebral bodies — a medical emergency when untreated
ICD-10: M46.20 · systemic condition
Spinal osteomyelitis — also called vertebral osteomyelitis or spondylodiscitis — is an infection of the vertebral body, disc space, or surrounding structures. Bacteria reach the spine through the bloodstream (hematogenous spread) from another site of infection — most commonly the urinary tract, skin, respiratory tract, or IV access sites. Staphylococcus aureus is the most common causative organism, including methicillin-resistant strains (MRSA). The incidence of spinal osteomyelitis has increased over recent decades, driven by the growth of IV drug use, aging populations with more comorbidities, and rising rates of spinal instrumentation. Untreated or delayed-treated vertebral infections can lead to vertebral collapse, epidural abscess, spinal cord compression, and sepsis — making prompt diagnosis critical.
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The incidence of hematogenous vertebral osteomyelitis has increased significantly in recent decades, now estimated at 2.2–5.8 cases per 100,000 person-years, driven by IV drug use and aging populations.
Nickerson EK et al., Journal of Clinical Microbiology (2016)50%
Staphylococcus aureus accounts for approximately 50% of all hematogenous vertebral osteomyelitis cases; MRSA strains account for up to 30% of S. aureus infections.
Zimmerli W, New England Journal of Medicine (2010)Symptoms
- Severe, progressive back or neck pain — often worse at night and not relieved by position change
- Fever, chills, and night sweats
- Focal spine tenderness to percussion over the affected vertebral level
- Elevated inflammatory markers (ESR, CRP, WBC) on blood tests
- Neurological deficits (weakness, sensory changes) if epidural abscess is forming
- Unwillingness to move the spine due to pain and muscle guarding
Causes & Risk Factors
- Hematogenous (bloodstream) spread from a distant infection — urinary tract, skin/soft tissue, respiratory, or dental source
- IV drug use — a major and growing risk factor
- Contiguous spread from adjacent spinal surgery, especially hardware infections
- Immunocompromise — diabetes, HIV, chronic steroid use, or immunosuppressive therapy
- Urological procedures — urinary catheterization, cystoscopy
- Endocarditis — infection of the heart valves seeding the spine
Imaging Findings
Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.
MRI
- T2 hyperintensity and T1 hypointensity within the disc and adjacent vertebral endplates — the earliest and most sensitive finding
- Disc height loss and endplate erosion or destruction at the infected level
- Paraspinal soft tissue phlegmon or abscess: T2 bright fluid collection with peripheral rim enhancement adjacent to the infected vertebrae
- Epidural abscess: posterior or anterior epidural collection compressing the thecal sac — cord signal change if compression is significant
- Note: MRI with gadolinium is the gold standard for vertebral osteomyelitis; X-ray and CT changes lag MRI by 2–4 weeks
CT Scan
- Vertebral endplate erosion and disc space destruction — best characterized by CT for surgical planning
- CT-guided biopsy: preferred method for obtaining microbiological diagnosis when blood cultures are negative
- Paraspinal abscess extent and any psoas involvement — determines surgical drainage approach
- Vertebral body integrity assessment for fracture risk and need for stabilization
X-Ray
- Disc space narrowing and endplate erosion — lags behind MRI changes by 2–4 weeks
- Vertebral body height loss or compression fracture in advanced infection with bone destruction
- Normal early X-ray does not exclude vertebral osteomyelitis — MRI is required when clinical suspicion is present
Who Is Commonly Affected
The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.
Peak Age Range
60–70 years (reflecting increased frequency of bacteremia from IV access, urological procedures, and dental work in older patients)
Gender Distribution
Male predominance (approximately 1.5–2:1); IV drug use, diabetes, and chronic renal failure are major risk factors
Estimated Prevalence
Incidence approximately 2–7 per 100,000 per year in high-income countries; rising with aging populations, increased use of invasive procedures, and immunosuppression; lumbar spine most commonly affected (approximately 50%), followed by thoracic (approximately 35%)
Treatment Options
Conservative
- Intravenous antibiotics — typically 6 weeks of IV followed by oral therapy; tailored to blood culture or biopsy organism
- Spinal immobilization with a brace to prevent vertebral collapse and reduce pain
- CT-guided biopsy — essential to identify the causative organism and guide antibiotic selection
- Nutritional support — adequate protein and caloric intake critical for healing
Surgical
- Surgical debridement and drainage — for epidural abscess causing neurological compromise
- Vertebral reconstruction and instrumented fusion — for vertebral collapse or spinal instability after infection control
- Posterior decompression with or without stabilization — for cord compression with motor deficits
When to see a spine specialist
Seek emergency evaluation immediately if you have severe back pain with fever, neurological symptoms (leg weakness, bladder/bowel dysfunction), or known risk factors (IV drug use, recent spine surgery, diabetes, or immunosuppression). Spinal osteomyelitis can rapidly progress to an epidural abscess — the window for preventing permanent neurological injury may be very narrow. Do not wait for symptoms to improve on their own.
Specialists Who Treat Spinal Osteomyelitis (Vertebral Infection)
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Questions to Ask Your Doctor
Bring these questions to your next appointment about spinal osteomyelitis (vertebral infection).
- 1
What organism is causing my infection — has a blood culture or CT-guided biopsy confirmed the pathogen, and is antibiotic susceptibility testing complete before starting treatment?
- 2
Is there an epidural abscess compressing the spinal cord, and does that require urgent surgical decompression alongside antibiotic therapy?
- 3
What is the source of infection (hematogenous spread from bacteremia, post-procedure, contiguous spread) and has the primary source been addressed?
- 4
What is the recommended antibiotic duration — typically 6 weeks IV or oral for most bacterial vertebral osteomyelitis — and which regimen is appropriate for my organism?
- 5
Does my spine have enough structural integrity to bear weight, and is bracing or surgical stabilization required to prevent vertebral collapse?
Research Evidence
No studies reviewed yet for this condition. Check back soon — our evidence pipeline runs nightly.
Clinical Evidence
Frequently Asked Questions
How is spinal osteomyelitis diagnosed?
MRI with contrast is the gold standard imaging study — it detects vertebral marrow edema, disc space involvement, and epidural extension with high sensitivity. Blood cultures and inflammatory markers (ESR, CRP) are drawn immediately. CT-guided needle biopsy of the disc/vertebral body is performed to identify the organism in approximately 50–70% of cases. PET-CT is increasingly used for difficult cases where the diagnosis or treatment response is uncertain.
How long does antibiotic treatment for spinal osteomyelitis take?
Standard treatment is 6 weeks of intravenous antibiotics, often followed by an extended oral antibiotic course (4–6 additional weeks) for complex cases, hardware infections, or MRSA. Total treatment duration can be 3–6 months. Treatment response is monitored with serial CRP and ESR measurements — normalization of these inflammatory markers, combined with resolution of symptoms, guides antibiotic discontinuation.
Does spinal osteomyelitis always require surgery?
No — the majority of spinal osteomyelitis cases without neurological compromise or spinal instability can be treated successfully with antibiotics alone. Surgery is required when there is epidural abscess with progressive neurological deficits (emergent), vertebral collapse causing myelopathy or spinal instability, persistent infection despite appropriate antibiotic therapy, or the need for tissue diagnosis when biopsy has failed. Approximately 30–40% of patients ultimately require surgical intervention.