I am female, age 72, and my orthopaedic dr. diagnosed my right knee requiring total replacement soon. He gave me a cortisone shot and I have been managing okay but I know I need it. Last night I went for a nice walk (I am active but not doing the walking I used to do). During the night, my big toe on my right foot started hurting and became very inflamed. Since early morning, I ve been applying ice and also warm water. It s not making any difference. Hurts to walk and occasionally, I get sharp pains in it. What could this be? I do have arthritis thru out my body. No need to answer, I ve been able to get a Dr. appointment