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.
Near miss or dangerous occurrence are also terms for an event that could have caused harm but did not. Please note: The term incident is used in some situations and jurisdictions to cover both an accident and incident. It is argued that the word accident implies that the event was related to fate or chance.