A modular device is configured to provide different levels of knee extension to a patient by being moveable between an assembled or "rest" configuration and a detached or "therapy" configuration. The device includes a proximal section with an inclined upper surface and a separate distal section with an inclined upper surface. When attached, the proximal and distal sections form a single continuous incline for supporting a patient's leg. At least one of the sections also includes an ankle supporting cavity that holds the patient's ankle and heel and provides greater stretching/extension of the patient's knee.
