Having done a fair bit of long distance running and basketball during my career, in addition to all the normal Army stuff, it's caught up with me after 16 years. Suffered worsening chronic knee pain over recent years. MRI scans etc have resulted in me being permanently downgraded (still deployable to base locations) but excused BPFA / CFT for the rest of my career, to preserve what is left of my knees. Basically, the ligaments etc are ok but the bones have worn down and the damage is irreversible. I have been told that I will have arthritis by the time I am 40, and will require knee replacement surgery in both legs. Has anyone had this surgery before? Is it something you leave as late as possible, or is it something to try and get done early? I have seen some websites which seem to show two themes: 1. They will only do one leg at a time (i.e. full recovery on one before doing the other) 2. It can take a year or more to fully recover from each operation. Firstly, has anyone got first hand experience of this? The doctor suggested it would wait until I was in my 40s or 50s, but I will be very surprised if I can still climb stairs in ten years (I'm 33). Secondly, any thoughts on getting it done whilst still serving vs waiting till I'm out? In the NHS partnership days, I'm sure the old "Army butcher" reputation has been left behind...?