An implant for placement between adjacent spinous processes in a spinal motion segment of a scoliotic spine, the implant comprising: a body defining a longitudinal axis, a first arm and a second arm, wherein the first arm includes a pair of first extensions (42a, 42b) and a first bridge, wherein the first extensions (42a, 42b) are configured to receive the first spinous process there between the first extensions (42a, 42b), wherein the first arm is rotatably connected to the body and rotationally movable between an undeployed configuration and a deployed configuration, wherein the first bridge is angled with respect to a sagittal plane of the implant such that the first extensions (42a, 42b) and the first bridge cooperate to laterally stabilize the body with respect to a first spinous process that is angled with respect to the sagittal plane of the implant when the first spinous process is between the first extensions (42a; 42b) of the first arm in the deployed configuration and when the first spinous process is seated against the first bridge angled toward the first spinous process; and the second arm includes a pair of second extensions (44a, 44b) and a second bridge for seating a second spinous process, wherein the second extensions (44a, 44b) are configured to receive the second spinous process between the second extensions (44a, 44b), wherein the second arm is rotatably connected to the body and rotationally movable between an undeployed configuration and a deployed configuration, wherein the second arm is configured to laterally stabilize the body with respect to the second spinous process when the second spinous process is received by the second arm in the deployed configuration; characterized in that the first and second arms (14; 16) are configured for placement between adjacent spinous processes of the scoliotic spine in which at least one of the adjacent spinous processes has a projection in a coronal plane that is angled with respect to the sagittal plane; and wherein the plane of the first bridge forms an angle with a sagittal plane that is between 5 and 60 degrees or between 120 and 175 degrees and the plane of the second bridge forms an angle with the sagittal plane that is between 5 and 60 degrees of between 120 and 175 degrees. a body defining a longitudinal axis, a first arm and a second arm, wherein the first arm includes a pair of first extensions (42a, 42b) and a first bridge, wherein the first extensions (42a, 42b) are configured to receive the first spinous process there between the first extensions (42a, 42b), wherein the first arm is rotatably connected to the body and rotationally movable between an undeployed configuration and a deployed configuration, wherein the first bridge is angled with respect to a sagittal plane of the implant such that the first extensions (42a, 42b) and the first bridge cooperate to laterally stabilize the body with respect to a first spinous process that is angled with respect to the sagittal plane of the implant when the first spinous process is between the first extensions (42a; 42b) of the first arm in the deployed configuration and when the first spinous process is seated against the first bridge angled toward the first spinous process; and the second arm includes a pair of second extensions (44a, 44b) and a second bridge for seating a second spinous process, wherein the second extensions (44a, 44b) are configured to receive the second spinous process between the second extensions (44a, 44b), wherein the second arm is rotatably connected to the body and rotationally movable between an undeployed configuration and a deployed configuration, wherein the second arm is configured to laterally stabilize the body with respect to the second spinous process when the second spinous process is received by the second arm in the deployed configuration; characterized in that the first and second arms (14; 16) are configured for placement between adjacent spinous processes of the scoliotic spine in which at least one of the adjacent spinous processes has a projection in a coronal plane that is angled with respect to the sagittal plane; and wherein the plane of the first bridge forms an angle with a sagittal plane that is between 5 and 60 degrees or between 120 and 175 degrees and the plane of the second bridge forms an angle with the sagittal plane that is between 5 and 60 degrees of between 120 and 175 degrees.