 [ Symptoms ] i had lumbar spinal fusion on 10112016 i am now having alot of pain recommended procedure consider too dangerous [ Disease ] clearly something went wrong with the fusion operation do u have fever and when did the fluid start to build up is ut after the surgery really sorry wish i could help more but need more answers can you post your ct scan or mri for now try resting with flextion hip and knee 90degrees over pillows or sheetsalso use antiinflamatory if you have fever you should use antibiotics goodluck