Psoriasis: The most common skin disorder that also affects the joints, including the knees, is psoriasis. Although certainly not all patients with psoriasis will develop joint problems, psoriatic arthritis may cause knee pain and swelling. ...Read more.
Definition of accident. 1  1a : an unforeseen and unplanned event or circumstance Their meeting was an accident.b : lack of intention or necessity : chance They met by accident rather than by design.
Definition of hazardous. 1  1 : depending on the effect of unpredictable and unanalyzable forces in determining events : depending on hazard (see 1hazard 3a) or chance hazardous outcomes. 2  2 : involving or exposing one to risk (as of loss or harm) a hazardous occupation disposing of hazardous waste.