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 incident. 1  1 : occurring or likely to occur especially as a minor consequence or accompaniment the confusion incident to moving day. 2  2 : dependent on or relating to another thing in law. 3  3 : falling or striking on something incident light rays.