Abstract: A spinal manipulation device (30; 80; 90; 100) adapted to protect, in use, a spinal cord from excessive axial and/or shear translations, the spinal manipulation device comprising a guide (31, 32; 81, 82, 83; 91, 92, 93; 101, 102, 103) configured to constrain, in use, movement of a first arm (35; 86; 96;106) relative to a second arm, the first arm and the second arm being fixable to and extending from a segment of spine undergoing manipulation, wherein, in use, the guide constrains movement of the first arm (35; 86; 96; 106) relative to the second arm (36; 87; 97; 107) to be about a substantially fixed centre of rotation located at least partially within the segment of spine undergoing manipulation, thereby protecting the spinal cord from excessive axial and/or shear translations.

Abstract: The present invention provides a bone anchor, and a method of using the same, the bone anchor comprising a hollow cylindrical housing, buttress means attached to the distal end of said cylindrical housing comprising one or more releasable anchors, a threaded rod rotatably placed within the internal space of said housing, said threaded rod is mechanically linked to the buttress means, wherein said anchors are capable of being moved between an open conformation and a closed conformation and vice versa by means of manipulating the proximal end of said threaded rod.