 [ Symptoms ] i have pain in my knee under the knee cap the back of my knee and my thigh is this just arthritis  some times i can hardly stand i have always tucked my leg under me when i sit down i can not any more the pain is too harsh some times my thigh muscles and calf muscles hurt so bad is this all part of arthris [ Disease ] it would be better if it is done with ultrasound guidance but its not compulsory depending on the painful part the injection can be given