"referral to physio about knee"

I have arthritis in my knee and I was getting extreme pain when cartilidge or something in that area of the knee was getting caught. The pain would last from 20 minutes up to 6hrs and I could not walk or put any weight on my leg. My knee problem is at least 5 years old and getting worse in the past few months. I cannot walk far with crutches and no where without them except at home where I hold on to furniture etc. The doctor sent me for physio. I had 2 appointments with the physio telling me to do specific exercises to help build up the muscles around my knee.