An expandable interspinous spacer implant for insertion into an interspinous space between a spinous process of a superior vertebral body (Vs) and a spinous process of an inferior vertebral body (Vi), the implant having a first end and a second end with a length therebetween, a proximal side and a distal side with a width therebetween, and an expandable height, the implant comprising: a first pair of legs (110, 120) on the proximal side and a second pair of legs (130, 140) on the distal side; a first plate and a second plate; the first plate and second plate each including a hole for receiving a fastener; a fastener coupled between the first and second plates (160, 170) via the first plate hole and second plate hole; and a superior bearing surface and an inferior bearing surface, characterized in that the first pair of legs (110, 120) is joined in a scissor-like fashion and the second pair of legs (130, 140) is joined in a scissor-like fashion, the first pair of legs (110, 120) and the second pair of legs (130, 140) pivotally coupled by one or more pins that span the width of the implant, each leg (110, 120, 130, 140) having a first end and second end and multiple slots (112, 114, 122, 124, 132, 134, 142, 144) along its longitudinal axis (A-A, B-B, C-C, D-D), the first end of each of the first pair of legs (110, 120) coupled to the corresponding first end of each of the second pair of legs (130, 140) by superior cross pins (180, 184) and the second end of each of the first pair of legs (110, 120) coupled to the corresponding second end of each the second pair of legs (130, 140) by inferior cross pins (182, 186); the first plate is coupled to a first pair of roller pins (162, 164) and the second plate is coupled to a second pair of roller pins (172, 174); each roller pin (162, 164, 172, 174) disposed between a pair of said slots (112, 114, 122, 124, 132, 134, 142, 144); and the superior bearing surface is coupled between the superior cross pins (180, 184) and the inferior bearing surface is coupled between the inferior cross pins (182, 186); wherein, rotation of the fastener results in the first plate and the second plate being drawn toward each other causing the expansion of the height of the implant. a first pair of legs (110, 120) on the proximal side and a second pair of legs (130, 140) on the distal side; a first plate and a second plate; the first plate and second plate each including a hole for receiving a fastener; a fastener coupled between the first and second plates (160, 170) via the first plate hole and second plate hole; and a superior bearing surface and an inferior bearing surface, characterized in that the first pair of legs (110, 120) is joined in a scissor-like fashion and the second pair of legs (130, 140) is joined in a scissor-like fashion, the first pair of legs (110, 120) and the second pair of legs (130, 140) pivotally coupled by one or more pins that span the width of the implant, each leg (110, 120, 130, 140) having a first end and second end and multiple slots (112, 114, 122, 124, 132, 134, 142, 144) along its longitudinal axis (A-A, B-B, C-C, D-D), the first end of each of the first pair of legs (110, 120) coupled to the corresponding first end of each of the second pair of legs (130, 140) by superior cross pins (180, 184) and the second end of each of the first pair of legs (110, 120) coupled to the corresponding second end of each the second pair of legs (130, 140) by inferior cross pins (182, 186); the first plate is coupled to a first pair of roller pins (162, 164) and the second plate is coupled to a second pair of roller pins (172, 174); each roller pin (162, 164, 172, 174) disposed between a pair of said slots (112, 114, 122, 124, 132, 134, 142, 144); and the superior bearing surface is coupled between the superior cross pins (180, 184) and the inferior bearing surface is coupled between the inferior cross pins (182, 186); wherein, rotation of the fastener results in the first plate and the second plate being drawn toward each other causing the expansion of the height of the implant.