This is similar to what I have currently. My defect is 1.4 x .9 and pains me sometimes. At times, its quite painful, but not really often. 3 well known orthopedic surgeons have varying degrees of advice. One said outright dont do anything, ramp up my game and if it still hurts fix it or adjust my life. He gave me this song and dance I am getitng older, time to slow down. Basically the old joke... "Doc it hurts when I do this." "Well.. dont do that then." ....
The next said similar. If I had no symptoms, he would recommend not doing anything, but since I do have some syptoms, fix it or it will get worse over time. The third, told me fix it. I worry that in some years, the defect will grow so I am leaning on getting it fixed. Each one had varying idea about the future, but the theme was the same. More damage would come down the road. I am still fairly young and wish to avoid total knee replacement. I think fixing now is a pre-emptive strike and will stop more wear from coming. I hope I am right..
Good luck.