Interspinous process implant having a thread-shaped wing and method of implantation

A method, comprising:

• inserting into a patient's body a first implant member via a passageway from a direction substantially parallel to a lateral axis defined by a pair of adjacent spinous processes such that at least a proximal portion of the first implant member is disposed between the pair of adjacent spinous processes and a distal portion of the first implant member is disposed on a first side of a spinous process from the pair of adjacent spinous processes, wherein the inserting the first implant member includes rotating a spiraled portion of the first implant member about the lateral axis between the pair of adjacent spinous processes;
• inserting into the patient's body a second implant member via the lateral passageway from the direction such that a proximal portion of the second implant member is disposed on a second side of the spinous process opposite the first side;
• coupling, after the inserting the first implant member and the inserting the second implant member, the second implant member to the first implant member.