130 the prosthetic spinous process 135 and the two prosthetic transverse processes 140 essentially mimic the relative size shape and positioning of the natural lamina 20 the two natural superior facets 25 the two natural inferior facets 30 the natural spinous process 35 and the two natural transverse processes 40 whereby to effectively restore the vertebra if desired holes 150 may be provided in the prosthetic spinous process 135 and or the two prosthetic transverse processes 140 so as to facilitate re attaching soft tissue to these structures looking next at fig8 there is shown a novel prosthesis 200 which is adapted to replace natural lamina 20 the two natural superior facets 25 the two natural inferior facets 30 and natural spinous process 35 to this end prosthesis 200 comprises a pair of prosthetic mounts 215 a prosthetic lamina 220 extending from prosthetic mounts 215 a pair of prosthetic superior facets 225 extending from prosthetic mounts 215 and prosthetic lamina 220 a pair of prosthetic inferior facets 230 extending from prosthetic lamina 220 and a prosthetic spinous process 235 extending from prosthetic lamina 220 in the use of prosthesis 200 natural lumbar vertebra 5 is resected at its natural pedicles 15 so as to remove the natural lamina 20 the two natural superior facets 25 the two natural inferior facets 30 the spinous process 35 and the two natural transverse processes 40 leaving a pair of pedicle surfaces 41 fig4 then the prosthesis 200 may be attached to the natural pedicles 15 e g by placing prosthetic mounts 215 against pedicle surfaces 41 and then passing screws 145 through holes 247 and into natural pedicles 15 as seen in the drawing the relative size shape and positioning of prosthetic lamina 220 the two prosthetic.