Fusion vs MicroDiscectomy with normal disc height

[cp7959]

I don't understand why a surgeon chooses Fusion over microdiscetomy as well. From the many medical WEB sites I have read if you have an annular tear the preferred surgery is fusion or ADR.

I don't really understand because if you have a herniation with an extruded disc, other than the fact of disc materiel extruded with a herniation, both have a hole (tear) in the disc. So why is a microdiscetomy OK with a extruded herniation or non extruded and a fusion for annular tear?

Yes there are other solutions out there, but the vast medical community is supporting fusion or ADR as the standard.

My surgeon explained to me that with an annular tear, if you do a microdiscectomy the hole is still there, isn't that true with a microdisectomy for a extruded herniation? Maybe with an annular tear it comes done to having DDD and it's ability to heal, versus a normal disc with a herniation?

Got me any one have the answer?