Strained muscle or something worse?

I'm now hitting the 5 month post op on my TKR. At 2 1/2 months I asked my surgeon when I could go back to work. His response was "I don't know why you're not already." His manner is very cold. His PA released me with restrictions. My job is housekeeping at a local cabin and motel rental. About 3 weeks ago I made a simple turn on my surgical leg and felt an immediate twisting, ripping in my calf. By the time I got home I could barely walk. I went to my primary the next day and she said it sounded like a strained muscle, wrote me out of work four days on complete rest and lots of ice packs. I followed her instructions to the letter but the stiffness, soreness and twisting feelings are back. I have an appointment with the surgeon next week and am not looking forward to seeing him because of his icy manner. I think it's time for a second opinion.