Had bone scan today, showed white spots lower back and hips, why is this? had bc 2005, stress fracture showed on normal xray

Decreased uptake: Photopenia or decreased uptake can mean further compression and loss of normal activity, ischemia or decrxeased perfusion, or sometimes result from infection. Clinical symptoms have to be correlated.

Degenerative changes: I assume the image you saw was white on black, which means that the white areas are where there is "uptake" of the radiopharmaceutical. If that is true , based on the locations you mention, most likely white dots are due to spurs ( benign bony overgrowths, facet joint arthritis, etc.).

Degenerive likely: Given the location described, and assuming the spots are white, normal wear and tear or degenerative disease of the spine and hips is likely.