Gonococcal arthritis is caused by infection with the gram-negative diplococcus Neisseria gonorrhoeae. In the United States, gonococcal arthritis is the most common form of septic arthritis.  In Western Europe, however, gonococcal arthritis is uncommon,  probably because of the 70% decline in gonococcal infections over the past 2 decades. 
Although the pathogenesis of articular involvement is controversial, it is ultimately a consequence of disseminated gonococcal infection (DGI). Gonococcal arthritis manifests as either as a bacteremic infection (arthritis-dermatitis syndrome) or as a localized septic arthritis. Arthritis-dermatitis syndrome includes the classic triad of dermatitis, tenosynovitis, and migratory polyarthritis.
Patients with gonococcal arthritis usually require initial hospitalization for intravenous (IV) antibiotic therapy; upon improvement, they can be switched to oral antibiotics. Unlike Staphylococcus aureus septic arthritis, gonococcal arthritis is rarely associated with joint destruction.
Pathophysiology and Etiology
Gonococcal arthritis is caused by infection with the gram-negative diplococcus N gonorrhoeae, a highly infectious organism capable of colonizing diverse mucosal surfaces. The risk of infection from a single contact with N gonorrhoeae is estimated to be 60-90% for women and 20-50% for men.  Common sites of infection include the urethra, cervix, pharynx, and rectum. Infection may be asymptomatic in some patients.
Hematogenous spread of the mucosal infection occurs in 0.5-3% of cases,  and disseminated infection is thought to play a major role in the pathogenesis of gonococcal arthritis. Patients with DGI may present with dermatitis-arthritis syndrome (60% of cases) or with a localized septic arthritis (40%). These presentations may represent different phases of a disease continuum.
The risk of dissemination after mucosal infection depends on both the ability of the patient’s immune system to control the infection and the virulence of the organism. Factors that correlate with an increase in this risk have been identified for both the host and the organism. Host-related risk factors for disseminated infection include the following  :
Low socioeconomic or educational status
IV drug use
Multiple sexual partners
Antigenic variation of pili
Protein Por B 1A on the outer membrane – This inhibits host factor H and C4-binding protein, making host complement cascade less effective
Lack of protein Por B 1B
Strains with nutritional requirements for arginine, hypoxanthine, and uracil (ie, AHU strains) – These are often associated with protein IA
Colony opacity (Opa) protein-independent invasion - Opa proteins are adhesins crucial to the process of N gonorrhoeae attachment to host cells, particularly avoidance of carcinoembryonic antigen-related cell adhesion molecule-3 (CEACAM3) 
United States statistics
Gonorrhea is the second most commonly reported notifiable disease in the United States, with 350,062 cases reported in 2014; sexually transmitted diseases are typically underreported, however, and the Centers for Disease Control and Prevention (CDC) estimates that approximately 820,000 cases of gonorrhea occur yearly in the US. 
Rates of gonococcal infection declined from their peak of 467.7 cases per 100,000 population in 1975 to an historic low of 98.1 cases per 100,000 population in 2009 but have risen subsequently. As of 2014, the national rate of gonococcal infection was 110.7 cases per 100,000 population, a 5.1% increase since 2013.  Within the United States, however, rates of infection vary by region (highest in the South and lowest in the Northeast) and demographics (see below).
The World Health Organization (WHO) estimates that 78 million cases of gonococcal infection occur annually.  The incidence of gonococcal infection is lower in Europe than in North America. In Sweden in 1992, for example, it was lower than 5 per 100,000 population, whereas in the United States in 1995, it was 150 per 100,000.  Gonococcal infection is common in developing countries, partly because of limited public health infrastructure and limited access to health care.
A 3-year retrospective study from France of 21 cases of disseminated gonococcal infection, which included 14 cases of arthritis, found that the number of cases increased from to 2009 to 2011. Men were at higher risk than women.  In a study of indigenous people in central Australia, the incidence of gonococcal arthritis was 911 of 100,000 gonococcal notifications. Cases were significantly more likely to occur in young (≤29 years) indigenous women than young indigenous men; risk was almost twice as high in women than in men. 
Age-, sex-, and race-related demographics
In the United States, the highest rates of infection in the United States are found in persons aged 20-24 years. However, rates are also high in those 15-19, especially females. In addition, while the gonorrhea rate decreased 5.0% in those aged 15–19 years during 2013-2014, it increased 12.1% in those aged 25–29 years, 12.7% in those aged 30–34 years, 15.3% in those aged 35–39 years, and 7.4% in those aged 40–44 years. 
In 2014, the rate of reported gonorrhea cases was higher in men than in women (120.1 versus 101.3 cases per 100,000 same-sex population). This continued a trend: During 2010–2014, the gonorrhea rate increased 27.9% in men but decreased 4.1% in women. 
Gonococcal infection is most common in African Americans.  Cases per 100,000 by race/ethnicity were as follows in 2014:
Blacks - 405.4
American Indians/Alaska Natives - 159.4
Native Hawaiians/Other Pacific Islanders - 102.1
Hispanics - 73.3
Whites - 38.3
Asians - 19.3
For patients with septic arthritis resulting from gonococcal infection, proper antibiotic treatment and joint drainage typically leads to full recovery. For patients with more severe manifestations of DGI, the prognosis varies, depending on complications or comorbidities. For example, patients with acute endocarditis may require valve surgery and can expect to undergo at least 4-6 weeks of antibiotic therapy. DGI-associated morbidity has decreased dramatically in the postantibiotic era. Complications are rare (1-3% of cases). 
Patient education is an integral part of proper therapy. Patients should learn about the sexual transmission of the disease and be informed regarding barrier methods of preventing it (condoms). In addition, education regarding specific risk factors or high-risk behaviors may help prevent further gonococcal infections or more severe sexually transmitted diseases (eg, HIV infection). Also important are identification, examination, and treatment of patients’ sexual partners.
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