SI-BONE, Inc. Common Stock, also called SI-BONE, is a medical device company. Read More It focuses on the development of implantable devices used in the surgical treatment of the sacropelvic anatomy. The firm's product, iFuse, seeks to fuse the sacroiliac joint to treat sacroiliac joint dysfunction that often causes severe lower back pain. The company was founded by Mark A. Reiley and Jeffrey W. Dunn on March 18, 2008 and is headquartered in San Jose, CA.