["I had a microfracture in my knee that needed surgery to heal correctly. It wasn't fun thinking about the surgery but I liked my doctor well enough.", 'I am really sorry to hear that.  How are you healing from it?', "The surgery went pretty well. I'm not 100% yet but close."]
That's good.  I'm glad you had good doctors to help you get back on your feet (no pun intended).  Are you having o be out of work?
I had surgery on my knee. I researched the doctor thoroughly and felt confident he'd go a good job.