Pain behind the Knees â Causes, Risk Factors and Treatment. An injury or blow to the back of the leg due to a fall or some other accident may lead to considerable pain in the posterior knee region. A sprain may lead to considerable pain, that may be accompanied by redness and swelling.
Ontario is a Province in Canada. There are no US states by that name. There is Ontario California stateside. Valerie Lee.
Ontario. 1  a province in S Canada, bordering on the Great Lakes. 2  Lake, a lake between the NE United States and S Canada, between New York and Ontario province: the smallest of the Great Lakes. 3  a city in SW California, E of Los Angeles.