The best replacement for disc bulge is protrusion.

The best alternatives to disc bulge are rated as following:
★★★★★  protrusion
★★★★  disc herniation
★★★★  herniation
★★  disc protrusion
★  herniated disc
★  prolapse
★  extrusion
  generalized disc bulge

Your alternative for disc bulge is not listed? Suggest!
Speaking about disc bulge, one probably shouldn't forget about annular tear.

Other search terms related to disc bulge and their ratings are:
★★★★★ annular tear
★★★ annular fissure
★★ tear
You have in mind a companion for disc bulge and it is not yet here? Propose!



Google Trends

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disc bulge
protrusion
disc herniation