Bone grafting is among the most frequently performed surgical interventions globally. Yet despite their prevalence, these surgeries carry real risks, infection, nerve damage, hemorrhage, and the body’s outright rejection of foreign materials.
At Georgetown University, Styliani Alimperti, an associate professor of biochemistry and molecular and cellular biology at Georgetown’s School of Medicine, is engineering 3D printed grafts built from substances the body already recognizes.
“The process of making the body regenerate its own tissue is very challenging because of aging, injury and other factors,” Alimperti said. “Engineering tissue parts or whole organs that are closer to the native ones with the proper structures and cells will help the regeneration and restoration of the tissue.”
Conventional Approaches Fall Short
Grafts today typically rely on one of two sources: bone harvested from the patient or a donor, or metal-and-synthetic assemblies of screws, plates, and polymers. Both carry significant drawbacks.
Harvesting bone from one site to repair another can trigger new fractures, chronic pain, and infection at the donor site. Metal-based constructs, meanwhile, sit in biological territory they were never designed for.
“Metal is not something we have in our system. Bones are not made out of metal, so the successful integration between bone and metal is very low and blocks the regeneration capacity of the bone.”
Pectin as the Foundation
Alimperti’s approach centers on pectin, the same compound responsible for the gel-like consistency of jams and fruit preserves, derived naturally from apple flesh and citrus peels. Far from a niche biomaterial, pectin is already processed routinely by the digestive system, making it inherently compatible with human biology.
“Pectin is compatible. It’s something good. It doesn’t harm our body,” Alimperti said. “It gives us the ability to challenge other methods that use toxic materials or synthetic polymers.”
The material also offers practical manufacturing advantages: it can be 3D printed at room temperature, bypassing the extreme thermal conditions many synthetic alternatives require. Its porous structure further encourages nutrient flow throughout the graft, supporting the live cells embedded within it and improving the odds of successful integration.
Structurally, the pectin layer is enclosed between two surfaces of hydroxyapatite, a calcium-phosphorus compound that occurs naturally in bone, which lends the graft density and mechanical strength. The resulting construct is designed to closely replicate the architecture of native bone tissue, and is currently being developed for applications in facial bones and the long bones of the limbs.
“With our technology, we want to make new grafts. We don’t want to take anything from the patient,” she said. “We can create new bone tissue without having all these complicated surgeries and using metal and other parts.”
The Road Toward Personalized Medicine
Alimperti’s lab is actively collaborating with Georgetown’s Office of Technology Commercialization, with the hope of one day making the technology accessible for patients. Current efforts are focused on extending the durability of pectin-based grafts so they can last longer before requiring replacement.
Future research aims to account for individual variables, age, sex, genetics, and bone density, to move toward grafts tailored to each patient’s physiology.
“We want it to be a personalized medicine tool. It cannot be the same for me, you and someone else to incorporate all the parameters, genetics, sex and age differences,” she said. “I hope this can create a new paradigm, a new shift in tissue engineering in orthopedics.”
The Industry Landscape Behind 3D Printed Bone Grafts
Alimperti’s research reflects that the medical manufacturing industry is moving away from rigid, foreign materials like titanium and synthetic polymers, and toward biocompatible substances that work with the body’s own healing mechanisms. The common thread running through new bone graft development is a focus on porosity, resorbability, and personalization, grafts engineered to mimic the internal architecture of real bone, dissolve as natural tissue regenerates, and be customized to individual patient anatomy.
Several companies are already putting this strategy into practice. Belgium’s Cerhum developed MyBone, the first commercially available 3D printed bone graft under the EU’s Medical Device Regulation, built from hydroxyapatite with a patented porous structure that promotes vascularization, resulting in bone ingrowth reportedly seven times faster than conventional graft granules.
Chicago-based Dimension Inx took a parallel approach to the U.S. market: its CMFlex product became the first FDA-cleared 3D printed regenerative bone graft, combining hydroxyapatite with a biodegradable polymer into a microstructurally porous composite that promotes bone regeneration in oral and maxillofacial applications.
Together, these efforts signal that the future of bone repair is no longer a question of whether natural materials can replace metal, but how soon.
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Featured image shows Alimperti uses a specialized 3D printer to create her pectin-based bone grafts. Photo via Georgetown University.
