By the time of my operation .....  3 weeks after the op setup ....my cartilage had 100% worn away and some of the bone to a dangerously point of no return.  They when they removed the cutouts ...they had broken parts of the bone to remove too. 
The grind away wear was very bad.

 

Non Pornographic actual pic of my incision.  :>))))  That's all the bigger now with today's technology. 
This is a file link to how well I'm walking after just one week out of surgery.    Mpeg   Download size:  "879k" for those with sloooww dialup.

October 05 Outside "Walk About" mpeg Zipped for choice of download rather than view online. 8.6mg