These models have the same characteristics as the "regular" Lumbar spines in terms of texture, material and options. They are just delivered with a pathology: herniated disc, stenosis, spondylolisthesis, metastasis, or fracture.
Theses spines are very interesting if you want to test and show the ability of an instrumentation for healing a specific disease.
They are also compatible with Creaplast holders (ref: LSHA (anterior) & LSHP (posterior); please check out the "Holders" page for more information)