I just rang the GP surgery reception to see if the knee x-ray had come through. This was a receptionist, not a doctor, and I was told "normal - no further action required". I have a doctor's appointment next week (4 March) to discuss this.
The persistent swelling outside and below the kneecap is still there along with the feeling of stiffness. I've reduced the sharp pains by doing less e.g. having food shopping delivered. The other right knee (which has some arthritis) is beginning to complain, maybe because I'm relying on it more.
Earlier last year (late summer or early autumn) I tripped on a rough pavement and fell on the left TKR knee - right on the left kneecap! it hurt at the time, of course, but I thought I had got away with it. Towards the end of the year I noticed an increase in the giving way feeling. My left leg is now a bit longer (after TKR) and previously (after TKR) the knee would kind of leap forward if I misjudged an up slope and drove my left foot into the slope. Maybe misjudging the slope is to do with the body's positioning system. This happened quite rarely - about once a month with no pain.
But more recently the giving way feeling was becoming daily and happening even when walking inside. This was before the step ups exercise (Jan 4) which triggered the pain and swelling in the left knee. So, despite this x-ray result I will want to see an orthopaedic surgeon.
I live in Cheltenham, UK. The first surgeon I saw (in late 2010) was Mr Harminder Gosal. He didn't want to operate on me because of my age. I was able to get about a bit even visiting some cathedrals in the summer, for the architecture, but I couldn't stand for any length of time - browsing bookshelves meant grabbing book(s) and finding a chair to sit on - not always available. This was due to arthritis. And there was the constant grinds you down arthritis pain.
After trying a cortisone injection (little change) Gosal suggested a second opinion and I had seen Mr John Mackinnon once by mistake so I saw him and he went ahead with the operation. Mackinnon has retired now and I have since found out that he was marginally more of a hip man than a knee man: Gosal is a knee specialist. However I don't think Gosal would say (or mean) "told you so" but it would be at the back of my mind.
edit:
Having the operation meant I could go on holidays again: Australia (twice), Istanbul, Madrid and Naples/Sorrento plus Hadrian's Wall, Yorks Dales, Isle of Wight and mid Wales - and I could do country walks again though I found out the left knee complained after about 4 miles so that was when to break for lunch.
The only other Cheltenham surgeon with more knee revisions (than Gosal) is Gennadii Kalap but I've never met him and I'm not sure I can demand to see a particular surgeon? I don't want to travel further for surgery.
Sorry for the length of this and please don't ask me to defend NHS delays.