In Budapest, a surgeon preparing for a complex operation can now hold a patient's spine in her hands before making a single incision — turning what was once a flat image on a screen into something tangible, rotatable, and real.
Researchers at Semmelweis University's Doctoral School have demonstrated that 3D-printed anatomical spine models significantly improve how surgeons plan challenging procedures. The study, published in World Neurosurgery, involved 41 specialists from three leading Hungarian spine surgery centers who evaluated life-size models created from medical imaging data against conventional techniques like X-rays, CT scans, and MRI.
The cases tested spanned some of the most difficult territory in spinal medicine: congenital deformities present from birth, rare developmental abnormalities, tumors, and patients who had undergone multiple prior surgeries — situations where metal hardware from previous interventions can obscure the anatomy even on detailed scans.
"In highly unique anatomical situations, every case represents a new learning process for the surgeon. Previous general anatomical knowledge alone is often not sufficient," said Dr. Péter Éltes, senior author of the study and spine surgeon at the National Center for Spinal Disorders. "It is particularly valuable not only to see a two-dimensional image of the spine but also to hold it, rotate it and examine it physically before surgery."
The physical models allowed surgeons to inspect anatomy from every angle and even rehearse procedures, drilling into the replica to test approaches before entering the operating room. Perhaps surprisingly, surgeons' opinions of the technology showed no correlation with experience level — veterans with decades of practice found the models just as valuable as their younger colleagues. Notably, 80 percent of participants had never used a 3D-printed anatomical model in clinical practice before the study, suggesting the technology's benefits extend broadly across the profession.
Beyond the operating table, researchers see potential for transforming how patients and families understand their own care. Benjámin Hajnal, a Ph.D. student at Semmelweis and the study's first author, described a future where a parent could hold a replica of their child's malformed spine while a physician walks them through the planned procedure.
"This represents a major step forward compared to CT or MRI scans, where we can show only two-dimensional segments," Hajnal said. "Understanding such images is often difficult for people without medical training."
The technology is not yet standard in operating rooms. Healthcare institutions must navigate strict quality assurance and regulatory requirements before routine clinical use. But researchers believe the tangible models could become a quiet revolution — one that gives surgeons sharper preparation, patients clearer understanding, and medicine a little more certainty in its most complex moments.