The Trephine Technique for ICBG Harvest Study published in Spine January 2021 found...
"Our results show that a trephine harvest technique provides ample autograft without complications and with no significant pain at the harvest site...the technique is not time-consuming and significantly less expensive than biological alternatives."
(McLain, Robert F. MDa; Techy, Fernando MD, FAAOSb Trephine Technique for Iliac Crest Bone Graft Harvest, SPINE: January 1, 2021 - Volume 46 - Issue 1 - p 41-47 doi: 10.1097/BRS.0000000000003702)