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.
A disastrous occurrence due to sudden, unexpected, or unusual cause. Accident; misfortune or mishap; that which comes by chance or without design. A loss from such an event or cause, as by fire, shipwreck, lightning, etc. An inevitable casualty is one that occurs through no fault of anyone.