SI-BONE, Inc. Common Stock, also called SI-BONE, is a medical device company, which engages in the research and development of minimally invasive surgical implant system. Read More Its 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.