Issues with my left knee started when I was 14.  The first time it subluxed I was on a trampoline and landed awkawardly.  The second time I was running through the classroom, it came out and pulled everything so far round that they chipped the bottom of my femur.  Before this happened no one believed me when I said the knee cap came out.

Anyway 14 years on I started getting new pains, approx beginning of this year, no idea what it was, but it felt like something was trapping like a nerve.  Still dont know what it is.  Went to my GP who opened up the whole case again.
This was Feb of this year and I was given options of where and who I wanted I see of the NHS 'Choose and Book' system.  My mid March I was seeing the consultant in a private hospital which was being funded by the NHS.
I was x-rayed, an MRI scan followed and I was booked in for a knee athroscopy for exploratory reasons, on the 21st May.  This was just to verify what he already thought which was i have no groove and its slightly domed also my ligament is ruptured.
The day came, I hadnt eaten since 6 the night before and I wasnt in surgery until midday (approx).  Twenty mins later I was in recovery.  Back to my room for a few hours and I still hadnt eaten.  The physio came in too talk to me about basic exercises and crutches.  Had a practice on the crutches going up and downstairs and nearly passed out due to no food, an anesthetic, and strong painkillers.
Left the hospital, got home and had to go straight back as my shoe had filled with blood so the dressings had to be changed.

First week or so was fine, then one night about midnight, I stretched my leg in bed and that trapping sensation returned but didnt stop.  The pain was immense, I was gripping my bed so tightly in the hope it would stop but it didnt.  I had to shout for my rents who stayed up till two with me and the pain still hadnt gone.  Every tiny movement caused great pain.  My mum got me some codiene and I told them to go to bed as there wasnt anything they could.  The pain lasted all night.  I tried to keep myself awake as when I fell asleep my leg would spasm. Six o clock rolled around and it still had not gone, too make matters worse I needed the loo and I couldnt move.  Even debated getting a tray underneath me to go but I couldnt prop myself up.  In the end I had to very slowly edge myself to the end of the bed and put my foot to the floor, as soon as it was on the floor it stopped.  The next day I was doped up on painkillers and could hardly talk.  To this day I dont know what that was but I pray to god I never get that again, touch wood I dont.

This really put me back as I was afraid to do anything.  Eventually i started to walk up and down the garden more and then the pain started in my calf.  I thought it was muscle atrophy at first as I couldnt put my foot on the floor and the pain was terrible.  Off to the doctors on a Thursday, he told me to carry on with exercises and stretching to help the muscle.  It just got worse and worse, back to the doctors on the Monday, he sent me to the DVT clinic to rule it out, I thought and he thought it cant be DVT as I dont fit the criteria.
I was scanned and low and behold, DVT, even the nurse in the clinic thought it couldnt be that as again I dont fit the criteria.  Seven days of injections and warfarin for three months.  Again this set my walking and exercises back.

Its two months on Saturday since a basic knee arthroscopy, well actually it turns out he removed some loose cartalidge under the knee cap, which i was not told about until about four weeks later! And not by the consultant!  Two months! and im still on one crutch.  Mentally unstable doesnt come close.  The quad muscle is non exsistent, I am working on exercises which is difficult when the knee swells due to the DVT.  In the morning I try not to use the crutch as thats when its at its strongest but I hobble badly, by the afternoon the leg starts to buckle.

I need further surgery but I have great doubts now.  I dont know whether to go for it as I have come this far or just put up with the subluxing for the rest of my life.  The DVT really worries me now also.

Anyway, thats my story so far, if I have further surgery I can add to this or I can document my current recovery.

Apologies for being such a long story and if this is in the wrong place!

What further surgery is needed? It sounds like you have gone through all of this and nothing useful was even done during the  arthroscopy to address your problems. While the fear of another DVT is valid, the fear of another useless surgery should also be in your mind.