A therapeutic device for supporting one or both of a patient's legs. The device is preferably constructed using a semi-rigid, and moderately flexible foam material such as polyurethane foam. The therapeutic leg support device includes a top portion, a base, a foot cutout located on the top portion, and a bottom cutout located on the base. Once a patient's foot and leg are placed into the foot cutout, the leg support device hinges in order to clasp the patient's leg. This prevents the patient's leg from twisting and/or falling out of the support device. Preferably, the therapeutic leg support device includes a connection mechanism on each side of the device. The user can interlock multiple leg support devices via the connection mechanism. This allows the patient to place both legs and feet into the foot cutouts, allowing for full hip abduction as well as facilitating full extension.