Described is a collapsible atrial cage for percutaneous delivery and implantation of an atrioventricular valve within an atrium of the heart. The atrial cage includes an atrial portion and a ventricular portion. The ventricular portion is attached with and separated from the atrial portion by a valve juncture portion. Notably, the cage includes at least one interlock shaped to lock with and secure an atrioventricular valve proximate the valve juncture portion. Thus, when deployed and expanded, the atrioventricular valve is secured at the atrioventricular juncture.