A device for moving a knee joint in a body of a patient is provided. The device includes a first arm member coupled to a first leg support configured to support an upper portion of a leg of the patient, a second arm member coupled to a second leg support configured to support at least one of a lower portion of a leg and a foot of the patient, and a control assembly operatively connected to the first and second arm members and configured to selectively move the second arm member relative to the first arm member. The control assembly includes a first motorized drive assembly coupled to the first and second arm members and operable to drive movement of the second arm member relative to the first arm member and a second motorized drive assembly coupled to the first and second arm members and operable to drive movement of the second arm member relative to the first arm member.