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Septic Arthritis: Causes, Symptoms and Treatment

Septic arthritis is a serious joint infection caused by bacteria or other pathogens, classified as a medical emergency that requires immediate treatment.

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Septic arthritis is a serious joint infection caused by bacteria or other pathogens, classified as a medical emergency that requires immediate treatment.

What is Septic Arthritis?

Septic arthritis (also known as infectious arthritis or bacterial joint infection) is a serious inflammation of one or more joints caused by the invasion of microorganisms into the joint space. Bacteria are the most common culprits, although viruses and fungi can also be responsible. The condition is considered a medical emergency because, without prompt treatment, permanent joint damage or even life-threatening complications can occur.

Large joints such as the knee, hip, shoulder, and elbow are most frequently affected. Septic arthritis can develop at any age but is particularly common in young children, older adults, and individuals with weakened immune systems.

Causes and Risk Factors

The most common cause of septic arthritis is a bacterial infection. Pathogens enter the joint through several routes:

Hematogenous spread (via the bloodstream): Bacteria from another infection site in the body (e.g., skin infection, urinary tract infection, pneumonia) travel through the blood and seed the joint.
Direct inoculation: Trauma, surgery, joint aspiration, or injections can introduce organisms directly into the joint.
Contiguous spread: Infection from surrounding tissue (e.g., osteomyelitis) extends into the joint.

The most common pathogens include:

Staphylococcus aureus (most frequent cause in adults and children)
Streptococcal species
Neisseria gonorrhoeae (in sexually active adults)
Haemophilus influenzae (in young children, now rare due to vaccination)
Gram-negative bacteria (in elderly or immunocompromised patients)

Key risk factors include:

Rheumatoid arthritis or other joint diseases
Diabetes mellitus
Immunosuppression (e.g., HIV, chemotherapy, corticosteroid use)
Intravenous drug use
Joint prostheses (prosthetic joint infection)
Recent joint surgery or aspiration
Skin infections or chronic wounds

Symptoms

Symptoms of septic arthritis typically develop rapidly and include:

Severe joint pain, worsening with movement
Swelling and redness of the affected joint
Warmth around the joint
Limited range of motion
Fever, chills, and general malaise

In infants and young children, symptoms may be less specific: irritability, guarding of a limb, or refusal to move the affected area are typical signs.

Diagnosis

Rapid assessment is critical. Typical diagnostic steps include:

Joint aspiration (arthrocentesis): The most important diagnostic procedure. The synovial fluid obtained is analyzed for cell count, bacteria, and other parameters. A markedly elevated white blood cell count (typically above 50,000 cells/µl) is characteristic.
Blood tests: Elevated inflammatory markers (CRP, ESR, leukocytes) indicate infection.
Blood and synovial fluid cultures: To identify the causative organism and determine antibiotic sensitivity.
Imaging: X-ray, ultrasound, or MRI help detect joint effusion, bone involvement, or rule out other diagnoses.

Treatment

Treatment must begin as quickly as possible to prevent joint destruction. It consists of two main pillars:

Antibiotic Therapy

Intravenous antibiotic therapy is initiated immediately, even before the pathogen is identified (empirical therapy). Once culture results are available, the treatment is adjusted accordingly. The total course of antibiotics typically lasts 2 to 6 weeks, depending on the organism and clinical response.

Joint Drainage

Removal of infected synovial fluid is essential. This can be achieved through:

Repeated needle aspiration: Drainage of joint fluid by needle, often suitable for accessible joints.
Arthroscopic lavage: Minimally invasive surgical washout and debridement of the joint.
Open surgical drainage: Required for severe infections, hip joint infections, or inadequate response to less invasive methods.

Supportive Measures

Joint immobilization during the acute phase, followed by early physiotherapy to preserve joint function
Pain management
Treatment of the underlying condition or primary infection source

Complications

Without timely treatment, septic arthritis can lead to serious consequences:

Permanent joint damage and cartilage destruction
Reduced joint mobility or complete joint stiffness (ankylosis)
Osteomyelitis (bone infection)
Sepsis with multi-organ failure
In children: growth disturbances due to damage to the growth plate

Prognosis

With early and consistent treatment, the prognosis for septic arthritis is generally good. The sooner therapy begins, the lower the risk of lasting joint damage. However, delayed treatment or infection in high-risk patient groups can result in permanent functional impairment.

References

Mathews C.J. et al. - Septic arthritis: current diagnostic and therapeutic algorithm. Current Opinion in Rheumatology, 2007; 19(5): 457-462.
Shirtliff M.E., Mader J.T. - Acute septic arthritis. Clinical Microbiology Reviews, 2002; 15(4): 527-544.
Ross J.J. - Septic Arthritis of Native Joints. Infectious Disease Clinics of North America, 2017; 31(2): 203-218.

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