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

No osseous fusion after spinal fusion surgery means that the bones intended to fuse together have not successfully merged. This can lead to ongoing pain, instability, and potentially the need for additional surgical intervention. Factors contributing to non-fusion may include inadequate bone healing, infection, or biomechanical stresses. It is crucial for patients to follow post-operative care instructions to enhance the likelihood of successful fusion.