Posted: 23/11/2013 at 22:41
if you have medical insurance, see a specialist knee surgeon. He/she will know much,much more about the workings of the knee and have access to and be much more prepared to use advanced diagnostic equipment such as MRIs etc.
There are numerous highly experienced world class surgeons working in Central London who would more than happy to see you privately.
The knee is too important to mess around with.