We've seen some pretty terrible leg injuries in sports over the last several years.

The latest belongs to Chicago Bears tight end Zach Miller, who dislocated his knee on what became an overturned TD catch in the third quarter of Chicago's 20-12 loss to the New Orleans Saints.

Helluva price for Zach Miller to pay for this TD catch (see left leg) #SaintsBears pic.twitter.com/zKVO3ss4J7

— J. Michael (@ThisIsJMichael) October 29, 2017

As bad as that looks, the end result could be even worse. Miller dislocated his knee, which is always a brutal injury. There's a good chance of damage to Miller's arteries and nerves, and surgery may require a grafting of arteries. These are risky procedures and Miller could end up losing his leg.

Zach Miller underwent emergency surgery Sunday in an effort to save his injured left leg, sources told @mortreport: https://t.co/4lrYXxp7gO

— SportsCenter (@SportsCenter) October 30, 2017

Even if the surgery turns out well, the 33-year old's career is likely over. Vikings QB Teddy Bridgewater suffered a less server seeming knee dislocation in August of 2016 and hasn't played since.

[Related: Did Skip Bayless go too far with Gordon Hayward tweet.]