I had bone cement, the told me lots of things but here a brief idea of what happened.
I developed a squishy spot on the or near the incision about 2.5 months after surgery. This spot then broke open and I ended up with fluid draining from the spot. Antibiotics followed along with more surgeries, Continued squishy spots that would eventually burst and leak fluid.
Bone paste was removed, problem still happened, over the year they seemed to clear up and then come back. Blood work showed no infection, but tests showed staph infection. Oral antibiotics and surgeries didn't cut it.
Finally 2 months of IV antibiotics seems to have cleared up the infection and I've had not more squishy spots or leaks.
I don't know if this is similar to your situation, but every time the story was different when I went in. So if it starts draining fluid, opt for antibiotics, and even IV antibiotics before more surgery. I could have avoided 4 surgeries if I had known.