Abstract: A device for exercising a patient's leg, including rehabilitating a patient's knee joint following knee surgery is disclosed. The device comprises an elongated member with a handle at one end, a harness for holding the patient's foot attached to the other end, and an adjustable slider assembly that can be positioned at a variety of locations along the elongated member. A fulcrum, which is attached to the slider assembly rests on the top of the patient's leg, either above or below the knee, while the harness holds the patient's foot. The device is operated by the patient pulling on the handle, thereby straightening the leg, which increases the range of motion of the knee joint following knee surgery. The device is adjustable to accommodate patients of varying heights and leg lengths and also to provide greater leverage in operating the device.