What Causes Groin And Thigh Weakness While Walking?

Hello, Today I had to stand at an information booth most of 3-4 hrs and I feel right groin/thigh weakness, some pain and uncomfortable when walking. I have had this ongoing for maybe a year now. Tomorrow I m to see an orthosurgeon for it. i ve read up in advance about osteoarthritis, septic arthritis and RA. Do I have any of these 3?