|Surgeon uses his eyes and fell to achive accuracy. Computer Image Guided Surgery enhances these modalities for higer accuracy.
Imagine the world of Cricket without the
third umpire to judge the run outs. In the
past the umpires did not get all the run
outs precisely – failing to judge it
correctly about 20% of time in close calls.
Unfortunately there was no option of TV
replays in those days and everyone
accepted the ‘fallacies’ of the human eye
and accepted the system. There was
resistance to change but now the TV
replays and the third umpire judging run
outs is well accepted – simply because
they are accurate and reliable.
Same is with knee replacement surgery. Good surgeons get near accurate alignment most of
the times. A detailed survey reveals accuracy level of experienced surgeons up to 75%. An
experienced surgeon’s eyes are good enough to judge up to 5 degrees out of alignments. There
are mechanical instruments which help to refine this error but these systems still have
limitations and fail to produce accurate alignment in about 25% of cases.
replacements which are out of alignment by
more than 3 degrees have higher chances of
Obviously a system was necessary to improve on this state to achieve perfection.
The combination of an experienced surgeon and highly accurate Knee
replacements which are out of alignment by more than 3 degrees have higher chances of
early failure. This is where the Computer Image Guided Surgery comes into picture. Image Guided
Surgery achieves correct alignment nearly every time.