plates the alignment device comprising at least one flexible strut extending between the pair of engaging plates during use application_number US 85237007 A description fig1 illustrates an embodiment of a modular lumbar interbody fixation system 100 the modular lumbar interbody fixation system 100 comprises a spinal implant 110 configured to be inserted into the intervertebral space between adjacent vertebral bodies 102 and 104 spinal implant 110 comprises engaging plates 112 and 114 and adjustment device 120 spinal implant 110 is used to replace an intervertebral disc that has been removed for various reasons including disease degeneration etc spinal implant 110 is adapted to maintain normal disc spacing to restore spinal stability and to facilitate a fusion between vertebral bodies 102 and 104 engaging plate 112 is configured to engage with vertebral body 102 and engaging plate 114 is configured to engage with vertebral body 104 engaging plates 112 and 114 may be constructed of titanium titanium alloy ceramics carbon composites other metals etc engaging plates 112 and 114 may be securely attached to vertebral bodies 102 and 104 respectively by way of for example cement between the respective surfaces or pins and or screws inserted through the engaging plate and into the vertebral body it engages engaging plates 112 and or 114 may contain a plurality of openings disposed therein to allow bone development and growth through the engaging plates 112 and 114 and through spinal implant 110 the engaging surfaces of engaging plates 112 and.