Across all sports I can think of a few that were as bad or worse...
Off the top of my head:
Joe Theisman's broken leg, he stood on the broken end of it for a second or two... horrifying.
The previously mentioned Shaun Livingston knee explosion.
Willis McGahee's knee in the national championship while he was on the Hurricanes.
This lineman on the Niners in the 90s... I think it was Bryant Young had a helmet go straight into his shin and it looked like it flat out shattered.
Freddie Mitchell, the jerk receiver, when he was in college he had a gruesome femur fracture, it did this whirly bird thing as he was rolled over in the tackle. As someone who had very recently broken their own femur when that play happened... I just about puked.
And the worst combination of gross and depressing...
Dave Dravecky (had to look it up to remember his name), beat cancer in his pitching arm, only to have his arm break in mid throw during a live game... that was traumatizing.