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Osteomyelitis – Causes, Symptoms & Treatment

Osteomyelitis is an inflammation of the bone and bone marrow, most commonly caused by bacterial infections. It can be acute or chronic and requires prompt medical treatment.

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Things worth knowing about "Osteomyelitis"

Osteomyelitis is an inflammation of the bone and bone marrow, most commonly caused by bacterial infections. It can be acute or chronic and requires prompt medical treatment.

What Is Osteomyelitis?

Osteomyelitis is an infection and inflammation of the bone and bone marrow. In most cases it is caused by bacteria, though fungi and other pathogens can occasionally be responsible. The condition can develop suddenly (acute osteomyelitis) or persist over a long period (chronic osteomyelitis) and affects both children and adults.

Causes

The most common cause is a bacterial infection that reaches the bone through one of three main routes:

Hematogenous spread: Bacteria travel through the bloodstream to the bone. This is the most common route in children and older adults.
Direct inoculation: Pathogens enter the bone directly through open fractures, surgery, or trauma.
Contiguous spread: An infection in adjacent tissue – such as a diabetic foot ulcer or pressure sore – spreads into the underlying bone.

The most frequently identified pathogen is Staphylococcus aureus. In infants and young children, streptococci and gram-negative bacteria also play a role. In immunocompromised individuals, unusual or opportunistic organisms may be responsible.

Risk Factors

Diabetes mellitus
Peripheral artery disease
Immune deficiency (e.g., HIV, immunosuppressive therapy)
Chronic kidney disease or dialysis
Recent orthopedic surgery or implanted hardware (prostheses, screws)
Intravenous drug use
Sickle cell disease (particularly in children)

Symptoms

The symptoms of osteomyelitis vary depending on whether the condition is acute or chronic:

Acute Osteomyelitis

Sudden, severe pain in the affected bone
Swelling, redness, and warmth over the affected area
Fever and chills
General feeling of illness and fatigue
Limited movement of the affected limb

Chronic Osteomyelitis

Persistent or recurring bone pain
Formation of a sinus tract (pus draining through the skin)
Poorly healing wounds over the affected area
General fatigue and malaise
Low-grade fever

Diagnosis

Diagnosis is based on a combination of clinical examination, laboratory tests, and imaging:

Blood tests: Elevated inflammatory markers such as CRP (C-reactive protein), ESR (erythrocyte sedimentation rate), and white blood cell count.
Blood cultures: Detection of bacteria circulating in the bloodstream.
X-ray: Often normal in early stages; bony changes become visible later in the course of the disease.
MRI (magnetic resonance imaging): The gold standard for early detection of bone and soft tissue infection.
CT (computed tomography): Used to assess bone destruction and sequestrum formation.
Bone scintigraphy: Detects increased metabolic activity in the bone.
Bone biopsy: Confirms the causative organism through tissue sampling; essential for guiding targeted antibiotic therapy.

Treatment

Treatment depends on the severity, cause, and identified pathogen and typically involves a combination of antibiotic and, where necessary, surgical therapy.

Antibiotic Therapy

Antibiotic therapy is the cornerstone of treatment. It should ideally be guided by culture results and sensitivity testing. In acute osteomyelitis, treatment usually begins with intravenous (IV) antibiotics, followed by a transition to oral medication. The total duration is typically 4 to 6 weeks and may be longer in chronic cases.

Surgical Treatment

Surgery is often required in chronic osteomyelitis, in the presence of an abscess, or when bone or soft tissue destruction has occurred. Surgical goals include:

Removal of dead bone and soft tissue (debridement)
Drainage of abscesses
Removal of infected implants or prostheses
Bone reconstruction in cases of extensive defect

Supportive Measures

Immobilization of the affected area (e.g., splint or cast)
Pain management
Optimization of underlying conditions (e.g., blood sugar control in diabetes)
Hyperbaric oxygen therapy as an adjunct in selected cases

Prognosis

When diagnosed and treated promptly, acute osteomyelitis is curable in most cases. Chronic osteomyelitis is more difficult to treat and prone to relapse. Potential complications include growth disturbances in children, pathological fractures, sepsis, and permanent joint damage.

References

Lew, D.P. & Waldvogel, F.A. (2004): Osteomyelitis. In: The Lancet, 364(9431), pp. 369–379. DOI: 10.1016/S0140-6736(04)16727-5
Kremers, H.M. et al. (2015): Trends in the Epidemiology of Osteomyelitis: A Population-Based Study, 1969 to 2009. In: Journal of Bone and Joint Surgery, 97(10), pp. 837–845.
World Health Organization (WHO): Antimicrobial resistance and bone infections. Geneva, WHO Press.

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