A percutaneous interspinous process device for treating spinal conditions includes a first section, a second section, and a locking mechanism. The first section defines a first lateral surface, a first medial surface and a first lumen extending from the first lateral surface to the first medial surface. The second section defines a second lateral surface, a second medial surface and a second lumen extending from the second lateral surface. The locking mechanism includes an elongate member protruding from the first medial surface of the first section and a medial recess defined in the second medial surface of the second section. The medial recess is configured for securely receiving at least a portion of the elongate member. The elongate member is configured to define a space between adjacent spinous processes and maintain a predetermined distance between adjacent spinous processes.