Are there supposed to be hard knnots in back after decompression laminectomy?

It Depends: Following a decompressive lumbar laminectomy, the muscles are sewn back together resulting in a firm contour immediately following surgery. Over time, this will flatten out as the muscles heal. Other 'knots' may represent muscle spasm that may respond to heat or medication. See your surgeon to be certain there is nothing of concern such as infection or CSF leak.