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Hi, It sounds like it could be that you've torn your meniscus again or that possibly some bit of loose/torn cartilege was not removed the first time. That bit of loose cartilege can move and get trapped in the joint, locking it or letting it give way. It can also be very painful (but not necessarily all the time). If your knee is giving you discomfort all the time, you quite likely have a(nother) torn meniscus.
If I were you, I'd get it evaluated again, including another MRI. My most recent orthopedist told me that sometimes you can have all the symptoms of a torn meniscus but it doesn't show up on the MRI, so be sure to discuss that with your doctor.
BTW, I have torn my meniscus (same one) three times--so don't assume they didn't fix it correctly the first time.
In December of 2007 I was playing cricket in the back yard with my brother .. I ran in to bowl, jumped and as i landed on my right foot, my knee just gave away and before i knew it i was lying on the ground.. after a minute or so i got up and walked but my knee felt very odd.. it started swelling a bit and got very sore .. I went to hospital and they did some tests and said nothing is wrong.. a few months went past and as i was just walking into a class room, the same thing happened.. knee just gave away and i was on the floor.. same feeling. This time around I went to see a Orthopedic Surgeon. we did sme X-rays and MRI scans.. I was booked for an op.
The doctor did an athroscopy and he was forced to cut in order to do a Lateral Release ... as I woke up the doc came to see me and i was told that i had lots of torn meniscus and he had to do a lateral relase.
about 7 months went past and in January 2009 for the first time I played some very light soft ball back yard cricket.. I was batting as I played a shot with my right leg straight - the same thing happened again. My knee gave away.. now note that this is way after i had my op.. eversince i just gave up but the last couple of days i have had discomfort in sleeping.. walking and moving around.. my knee has never felt right again...
PLEASE tell me what it sounds like ? what can it be and what has to be done to fix this ??