Vertebral osteomyelitis

Disease Description (Causes and Symptoms)

• Summary of definition: Vertebral osteomyelitis is a disease in which bacteria and other pathogens invade the vertebral bones (vertebral bodies), causing inflammation. It occurs through hematogenous spread or direct invasion, such as through surgery or injections.
• Causes and pathophysiology
  • Main causative organisms: Pathogens from infections in other areas, such as the skin, soft tissues, urinary tract, or endocardium—including Staphylococcus aureus—can spread to the spine through the bloodstream. Direct invasion may also occur through surgery, injections, acupuncture, and similar procedures.
  • Risk factors: Diabetes, kidney failure, chronic liver disease, malignant tumors, immunosuppression (steroids and anticancer drugs), intravenous drug use (IV drug use), and recent spinal surgery or invasive procedures.
  • Pathophysiology: When pathogens invade through the blood vessels of the spine, inflammation and necrosis develop in the bone marrow and around the disc. Abscess formation (paravertebral or epidural abscesses) and nerve compression may cause neurological deficits.
• Main symptoms
  • Persistent and worsening back pain (especially pain that continues at night or even at rest)
  • Fever, chills, general malaise, and weight loss
  • Neurological symptoms: muscle weakness, decreased sensation, paralysis, and difficulty passing urine or stool (in severe cases)
  • When it develops after surgery, it may sometimes be limited to local symptoms

Treatment Methods

• Diagnostic principles
  • Blood tests: Elevated ESR and CRP levels and an increased white blood cell count may be observed
  • Blood cultures: Collection before antibiotic administration is recommended (to identify the causative organism)
  • Imaging tests: MRI (the most sensitive for detecting infection and abscesses), CT, X-rays (to identify delayed changes), and bone scans as an adjunct
  • Biopsy/drainage tests: To identify the causative organism, culture is essential when performing a CT-guided spinal biopsy or abscess drainage
• Antibiotic treatment
  • The principle is to use organism-specific antibiotic treatment based on identification of the causative organism
  • Usual duration: At least 6 weeks of antibiotic therapy (2–3 months or longer may be necessary depending on the pathogen, extent of the lesion, and clinical response)
  • Initially, intravenous (IV) treatment may be followed by a switch to oral medication when clinical findings and test results improve
• Indications for surgical treatment
  • Progressive neurological deficits (such as paralysis)
  • Spinal instability or severe bone necrosis
  • A large epidural or paravertebral abscess that does not improve with medication
  • When biopsy or drainage is necessary (for diagnostic or treatment purposes)
  • If an infection develops in an implanted device used after surgery, removal of the device may be necessary
• Conservative treatment and lifestyle management
  • Pain control (analgesics), appropriate rest, and use of a brace when indicated
  • Infection management (optimizing general health, including blood glucose control)
  • Adherence to antibiotic treatment (strictly following the medication schedule) and regular blood test monitoring (ESR/CRP, liver and kidney function, etc.)
• Management of complications
  • If early diagnosis and treatment are delayed, there is a risk of abscess formation, spinal cord injury, permanent nerve damage, chronic pain, and spinal deformity
• Precautions
  • Collect blood cultures whenever possible before starting antibiotics
  • Do not stop treatment on your own (the full treatment period must be followed)
  • Long-term antibiotic treatment and follow-up are necessary even after surgery

Checklist Before an Outpatient Visit (Including Items to Bring and Example Questions)

• Items to bring (recommended)
  • A list of all medications currently being taken (including prescription drugs, over-the-counter medications, and supplements)
  • Past medical and surgical history (especially records of recent spinal surgery or injection procedures)
  • Recent test results (blood tests and imaging reports or CDs)
  • Notes recording when symptoms began and how they have progressed (pain characteristics, fever, changes in urination or bowel movements, etc.)
  • The latest management information for chronic diseases such as diabetes (blood glucose levels, etc.)
• Items to tell the doctor first during the outpatient visit
  • Recent history of infection (such as a urinary tract infection or skin infection) or history of IV drug use
  • Allergies (especially to antibiotics)
  • Whether you are pregnant (female patients)
• Information useful for the patient to provide to the medical staff during the consultation
  • The onset and changes in pain, whether there is nighttime pain, and when neurological symptoms (decreased sensation, muscle weakness, or difficulty urinating) began

Examples of General Questions to Ask the Doctor

• "Has the causative organism been identified? What are the blood culture and biopsy results?"
• "What type of antibiotic is recommended, and how long is the expected treatment period? Can I switch to oral medication?"
• "Is surgery necessary? If surgery is performed, what are the risks and expected recovery period?"
• "What drug interactions or side effects should I watch for during treatment?"

Examples of Disease-Specific Questions

• "Do the MRI or biopsy results show an abscess or spinal cord compression? Is immediate drainage or decompression surgery necessary?"
• "If there is existing metal hardware (an implant) inserted in the spine, is it likely that it will need to be removed?"

(Note: Diagnosis and treatment decisions vary depending on the treating physician's assessment and test results. When necessary, multidisciplinary consultation with neurosurgery, orthopedics, infectious diseases, and other departments is recommended.)