The article presents new concept of grip for in vitro strength tests of spines or spine-internal spine fixator sets. This grip does not need dividing the tested spine into tested segments (FSU and larger ones) according to the accepted testing plan. This is important because dividing makes spine useless for further examinations. They enable 'adjusting' the grip to the spine characteristic individual features e.g. lordosis or if necessary, scoliosis. The mechanical fixing system should guarantee stable fixing of extreme vertebras (from the accepted testing program point of view - compression / distraction, bending or torsion) as well as provide a possibility of positioning the spine on the required planes an axes. For the presented solution the load system can be any strength testing machine providing compression / distraction applied with the required accuracy preferably in a programmed way. and Obsahuje seznam literatury