Curved stairlifts can be fitted to any staircase. Straight stair lifts are for easy straight staircases, whereas curved stair lifts can be adapted to negotiate stairs that turn or bend. Outdoor stair lifts are also readily available, and can be fitted to outdoors steps if needed, to supply access to an entryway door or to a garden for example. There are various optional functions that can be included depending upon your requirements. For circumstances, if you have arthritis, you may find it agonizing to push the control buttons, in which case you might opt to have a joystick fitted rather. A swivel seat is another useful feature, making it much easier to get on and off your stair chair.