in order to estimate the strength of normal and spondylolytic vertebrae , vertebrae with laminectomy , anterior fusion , posterior fusion , and postero-lateral fusion , ( vertebral ) models were produced using acrylic resin ( a composite of vinyl ester resin 70 % and soft polyester resin 30 % ) for vertebrae and sponge rubber for intervertebral disc .
C0022983
laminectomy
C0549207
vertebrae