Researchers at UNSW Canberra are working on new 3D-printed implants that could fundamentally change the long-term treatment of bone fractures. The focus is on so-called bone scaffolds—porous support structures that temporarily stabilize damaged bone tissue and promote natural regrowth. Once healing is complete, the material degrades on its own, eliminating the need for an additional surgical procedure.
Unlike previous approaches, which typically rely on regular, repeating lattice structures, the team led by PhD candidate Kaushik Raj Pyla is pursuing a different path. The developed structures are based on stochastic lattices with irregular, randomly arranged patterns. The aim is to better replicate the complex internal architecture of natural bone. Polylactide is used as the material—a biodegradable plastic already established in medical applications. To achieve clean structures without typical printing defects such as stringing or sagging, printing temperature and retraction parameters were specifically optimized.
“Bone can be damaged in many locations, and its structure changes depending on where it is in the body,” Kaushik said. “We wanted to see if matching these patterns could help restoration. Our idea was to take existing bone patterns and check if they could be rebuilt through printing.”
“Under fast loads, the material acts more brittle, but it also absorbs energy more efficiently. This is important for real-world scenarios like falls or accidents,” Kaushik explained.
For mechanical evaluation, the team produced scaffolds with differently oriented internal gradients and examined their behavior under load. The results show that the scaffolds absorb more energy under fast, impact-like loads than under slow compressive loading.
“We found that certain designs performed especially well in both strength and fluid flow. This suggests that implants can be tailored depending on the stresses different bones experience,” Kaushik said.
“And with 3D printing, scaffolds can be customised to match the patient and injury.”
In addition to strength, fluid permeability also played a central role. Adequate perfusion with blood and nutrients is considered a prerequisite for cell growth and tissue regeneration. Some of the tested designs showed a favorable combination of mechanical stability and permeability, indicating the potential for targeted adaptation to different bone regions.
The need for new therapeutic concepts is high. According to Healthy Bones Australia, tens of thousands of people in the ACT region alone are affected by impaired bone health.
“These figures highlight the growing burden of osteoporosis and fracture-related injuries – and the importance of developing safer, more effective treatments like the 3D-printed bone scaffolds,” said Kaushik.
“Biodegradable scaffolds will likely play a key role in reducing both medical risks and overall treatment costs,” Kaushik added.
“We’re moving toward safer, more personalised implants that work with the body, not just in it.”
Clinical applications of the new scaffolds are still some way off. Biological testing, long-term studies, and regulatory approvals are still pending. Nevertheless, the researchers expect that personalized, biodegradable implants could play an important role in bone and tissue medicine in the coming years.
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