Mom had arthroscopic surgery on her right knee yesterday. The doctor cleaned out some yukky cartilage under the knee cap and also did a lateral release (freeing up the tendon so it doesn't pull the knee cap off track (any more). That should make it much less painful.
Lucky and I are on after care duty, keeping mom pinned to the sofa, without stepping on her leg. (Dad is going to have to do laundry, since it's in the cellar. Mom thinks that's sort of funny.) But anyway, Lucky and I are taking our job very seriously. All I can say is that we better get lots of treats for this.