The knee is a complicated knot with a number of important purposes. While the knee may appear durable, it is quite delicate, and prolonged force and pressure can lead to a class of painful conditions, some of that can become chronic and may exact surgery to repair. Professionals whose jobs request a great deal of kneeling, so as tile/floor layers, plumbers, erection workers, and contractors, are particularly at put in peril for knee injuries due to the intelligence of their work activities.