During my Laminctomy, ruptured Disc L4/5 and L5/S1 and stenosis, my surgeon found 2 cracked facet joints. Now he recommends a fusion. Is he correct?

Not yet. Facet joints are often resected partially (medial facetectomy) during performance of a laminectomy for stenosis. In the process facet joints may also be cracked. These almost always heal with time. Do not have fusion unless pain persists >6 months and can be localized with facet blocks to the specific fractured facets.