Disclosure - I am a pellet user.
The only legitimate study on pellet extrusion was done in the infancy of insertions, in 1999; a 20-year old study. Another study is referenced from 2013, but it is from one doctor. In his study, 4 out of 111 procedures had ONE pellet extrude.
My doctor should publish his stats. He has had ZERO extrusion in all the insertions he has done. Of course he warns his patients, NO STRENUOUS ACTIVITY or HEAVY LIFTING for one week.
It does cost more than injections. But not everyone is concerned about the increased cost for the substantial convenience. There are more negative comments on this board from guys who have NEVER used pellets, and are regurgitating what they “heard”. I have first hand experience with pellets. Ask if you would like to know more.