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.
The City of Ontario is located in southwest San Bernardino County with a population of 163,924 (2010 census). It is uniquely positioned as the center of Los Angeles, Orange, San Bernardino and Riverside Counties.