The best replacement for extrusion is injection molding.

The best alternatives to extrusion are rated as following:
★★★★★  injection molding
★★★★★  forging
★★★★  drawing
★★★  herniation
★★★  intrusion
★★★  protrusion
★★  casting
★★  injection blow molding
★  crown lengthening
★  disc protrusion
★  injection
★  injection moulding
★  die cast
  disc bulge
  disc herniation
  moulding
  extrusion
  herniated disc

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

Other search terms related to extrusion and their ratings are:
★★★★★ annular tear
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Google Trends

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extrusion
injection molding
forging