Tenon Medical, Inc. is a medical device company that develops surgical implant systems for treating severe lower back pain in the United States and Puerto Rico. Its CATAMARAN SI-Joint Fusion System is designed to fuse sacroiliac (SI) joints to treat SI-Joint dysfunction, a common cause of severe lower back pain. The system features a fixation device that passes through the axial and sagittal planes of the ilium and sacrum, stabilizing and transfixing the SI joints. Incorporated in 2012, the company is headquartered in Los Gatos, California.