People are obviously quick to assume that Martinez was injured, but perhaps the reason his legs looked shaky was that, you know, Cotto blasted him with a huge left hook a minute into the fight. I doubt any knee can return to full potential after a torn meniscus surgery, but Martinez started to look like his old self in rounds 4-6, before Cotto adapted to his adaptations and started to knock him around again.
This is just one of the few instances I can think of where one fighter blasted the other and, when that guy started wobbling around like a newborn calf, everyboy said, "Oh, his knees..."
How about, "Oh, that hook!"