41.   Without the ACL, a knee would buckle and players would fall to the ground.

42.   As Jaha ducked, his left knee buckled, and he tumbled forward in front of the plate.

43.   As Lieberthal lunged back toward the bag, his knee buckled.

44.   Following the game, Hamel said he felt his knee buckle immediately.

45.   Her knee buckled on the vault landing of a roundoff, back-flip with a half turn.

46.   His knees buckled as he walked down the steps to the dugout.

47.   His right knee buckled as he flew off the high bar, and he fell to the side of the mat.

48.   Her knees buckled and she collapsed.

49.   Lieberthal lunged toward the base, but his knee buckled.

50.   Lieberthal started to move back to first, but his knee buckled.