“As the cartilage wears down, the underside of the kneecap rubs against the front of the thighbone, and a bend in the knee can cause a crackly, crunchy, creaky, or even pop-like sound,” says Dr.

My finger joints regularly crunch as I move them, my ankles pop constantly ... My doctor said that the loud popping sounds in my knee are likely from a piece of frayed cartilage catching on something ...