Pre-ignition: Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. The two are completely different and abnormal phenomenon. DETONATION.
Arthroscopy is a way to view and repair the inside of a joint. Your surgeon uses a soft, pencil-thin tube called an arthroscope. This tube has a tiny video camera, a light and fluid-exchange paths. The arthroscope, and other small instruments, are inserted into the knee joint through small incisions.
Osteotomy is a surgery that repositions or reshapes the bones in your knee where osteoarthritis has caused damage. This procedure can only be done when only one area or side of your knee is damaged. The procedure changes the position or alignment of the knee so your weight shifts away from the damaged area.