nanOss Strataâ"¢ is designed to more closely mimic the structure of human bone, increase the graft's surface area, improve osteoconductivity and enhance the stimulation of cellular activity BELGRADE, Mont., Dec. 11, 2025 /PRNewswire/ -- Xtant Medical Holdings, Inc. (NYSE American: XTNT), a medical technology company focused on surgical solutions for spinal and other orthopedic conditions, today announced the commercial launch of its next-generation innovative synthetic bone graft in the nanOss line, Strataâ ...