The authors tested in experimentally a suitable shape and approach to replacement of an intervertebral disc by means of an endoprosthesis made from glass-ceramic material of Lasak Co. In experiments on post-mortem material they succeded eventually in creating the optimal shape and finding a route of administration of the endoprosthesis into the intervertebral space. The endoprosthesis should create a spondylodesis and primary fixation of the affected portion of the lumbar spine. In some instances it thus will not be necessary, after insertion of the ceramic prosthesis into the intervertebral space, to make a supplementary instrumental fixation. Key words: ceramic endoprosthesis, replacement of degenerated lumbar intervertebral disc.