What Causes Cracking Sounds In Knee While Standing?

My right knee cracks make sounds every time I stand up with not pain at the beginning few days later stiffens in the back of the knee...Lay-down tremendous discomfort and a little pain I started to taken the Glucosomine that always works and use a knee brace, but a this time I got hit by a wave in the ocean that I notice I twist the leg..two day later the pain don t go away with Ibuprofen..I start taking Parafon forte 2 daily, it was recovering, but today I have on the back of my knee notorious fat, is not a swelling, or maybe it this, and stiffness.I massage my leg from the back of the knee up and sense nudes, tense the cartilages...