Vertebral Osteomyelitis

Modern Study Review (AI-Generated)

High-Yield Summary

Vertebral osteomyelitis is a serious spinal infection primarily caused by hematogenous bacterial seeding, most commonly Staphylococcus aureus. Early diagnosis is critical to prevent irreversible neurological damage and spinal instability. Modern management balances prolonged targeted antibiotic therapy with timely surgical intervention for neurological compromise or mechanical instability. Multidisciplinary care involving infectious disease and spine surgery specialists optimizes outcomes.

Key Diagnostic Findings

Anatomy

• Infection typically begins in the vertebral body metaphysis due to end-arteriole anastomoses.
• Infection can spread across the intervertebral disc space, leading to discitis and potential epidural abscess formation.

Clinical Presentation

• Pain: Localized, severe spinal pain with muscle spasm.
• Systemic signs: Fever in ~50% of cases.
• Neurological deficits: Radiculopathy, myelopathy, or paralysis may develop with epidural involvement or vertebral collapse.
• Risk factors: Diabetes mellitus, intravenous drug use, immunosuppression (HIV, steroids), extremes of age.

Imaging

Classification Systems

• Acute vs. Chronic: Acute defined as symptoms <3 months; chronic >3 months.
• No universally accepted staging system; clinical severity and neurological status guide treatment.

Current Gold Standard Treatment

Non-operative

• Indications: No neurological deficits, stable spine, no abscess requiring drainage.
• Treatment:
• Targeted intravenous antibiotics for 6 weeks based on culture sensitivities.
• Immobilization with cervical or lumbar orthosis as needed.
• Close clinical and laboratory monitoring (ESR, CRP).
• Empiric antibiotics should be avoided until biopsy or blood cultures are obtained unless patient is septic.

Operative

• Indications:
• Progressive or significant neurological deficits.
• Spinal instability (assessed by White & Panjabi criteria in cervical spine).
• Presence of epidural abscess causing compression.
• Failure of medical therapy (persistent infection or worsening symptoms).
• Procedures:
• Surgical debridement and irrigation.
• Anterior decompression of spinal cord.
• Stabilization with instrumentation if instability is present.
• Obtain intraoperative cultures for targeted therapy.
• Multidisciplinary approach with spine surgery and infectious disease consultation is mandatory.

Modern Complications & Outcomes

Complications

Outcomes

• Early diagnosis and appropriate treatment yield good functional recovery in most patients.
• Neurological recovery depends on severity and duration of deficits before intervention.
• ESR and CRP normalization correlate with treatment success.
• Recurrence rates are low with adequate therapy but require long-term follow-up.

Classic Clinical Notes

Vertebral Osteomyelitis

• Via hematogenous spread, contiguous spread or direct contamination
• Risk factors = DM, extremes of age, IVDU, immunocompromised status (HIV, steroids)
• Remember to look for source of infection (eg. skin lesions, UTI, etc)
• Organisms = S. aureus (most common)
• Classification: acute = 3 mos of symptoms
• Pathophysiology – infection spread thru end arteriole anastomoses within metaphyseal region of vertebral body ? spreads across disc space

SSx:

• Presents with pain, muscle spasm & possibly neurology
• Fever (50%)
• Neurological deficit including radiculopathy, myelopathy, complete paralysis

Labs:

• Elevated ESR & CRP with normal CBC in 50%
• Blood cultures (+ve in 50%)

Investigations:

• X-rays – may not see changes in 1st 2-4 wks of infection
• CT scan with sagittal reformats to delineate bony destruction/sequestrum
• MRI to assess cord compression & presence of epidural abscess
• Biopsy to obtain tissue for culture & sensitivity – may be closed or open technique

Treatment:

Do not treat with empiric ABx in adults

• Need to assess stability (White & Panjabi in cervical spine) – may require surgical intervention because of instability
• Need to assess neurology ? significant or worsening neuro deficit is an indication for surgery
• IV ABx x 6 wks; cervical or lumbar orthosis, close observation if treating conservatively
• Indications for surgery:
• Progressive neuro deficit
• Significant neuro deficit
• Instability
• Epidural abscess
• Failure of medical therapy alone
• Surgery – I & D, tissue culture, anterior decompression +/- stabilization
• Should have referral to spine surgeon & infectious diseases

Last Updated on January 25, 2026 by orthonet