This video contains an artist's representation of what bone looks like at the microscopic level. While many think that bone is simply a solid piece of calcium, it is actually a living, changing tissue with blood vessels and various small areas of open space.

This animated video not only shows a knee arthroscopy from start to finish, but gives a representation of what the surgeon sees through the tiny camera during arthroscopy. It also provides a view of the anatomy of the knee joint and how it works and moves.