What does no osseous fusion mean after spinal surgery of the back?

No osseous fusion means that there is no bony growth or fusion between the vertebrae after spinal surgery of the back. This can be a desired outcome, depending on the type of surgery performed. In some cases, it is not necessary or even desirable for the vertebrae to fuse together. For example, in cases of spinal decompression surgery, the goal is to relieve pressure on the spinal cord or nerve roots, and fusion is not necessary. In other cases, such as spinal fusion surgery, the goal is to fuse the vertebrae together to provide stability and correct a deformity. If no osseous fusion is seen after spinal fusion surgery, it means that the vertebrae have not fused together as intended, which could lead to complications and may require further treatment.