An Anticipated Revolution in Fracture Treatment Using "Gel Material"

SadaNews - When a bone fracture is severe or after the removal of a bone tumor, doctors usually resort to bone grafts from the patient's body or to solid metal implants. However, these solutions are not ideal; grafting requires additional surgery, and metals are harder than natural bone, which may lead to weakened fixation over time.

Today, researchers at the Swiss Federal Institute of Technology in Zurich (ETH Zurich) have developed an innovative gel material that could change this reality, according to a report on the scientific website "ScienceDaily".

The new material is a "hydrogel" consisting of 97% water and 3% biocompatible polymer. Despite its gelatin-like consistency, it can be laser-printed with extreme precision to form complex structures that mimic the internal structure of bone.

The most significant advantage is that this hydrogel does not function as a solid foreign piece to the body, but instead mimics the natural first stage of bone healing.

When a fracture occurs, the bone does not immediately turn into solid tissue; rather, a soft structure rich in cells and fluids is first formed, allowing immune and repair cells to pass through, before gradually transforming into cohesive bone.

The new hydrogel was designed to imitate this early stage, allowing osteoblast cells to enter it and build new tissue within.

To make the material moldable, the researchers added two special molecules: one that links the polymer chains together, and the other that reacts when exposed to laser light, leading to the hardening of specific locations only.

By using this technique, the team was able to print fine details down to 500 nanometers, achieve a record printing speed of 400 mm per second, and reproduce the internal mesh structure of bone known as "trabecular". For comparison, a small cubic piece of bone contains a network of tiny channels that stretch over dozens of kilometers.

Promising Initial Results

In laboratory experiments, bone-building cells successfully migrated into the printed structure and produced collagen, a key component in bone formation, in addition to interacting with the material without any negative effects.

So far, the material has only been tested in the lab, and the team is preparing to conduct animal experiments to study its ability to support bone healing inside a living body.

Among the features that distinguish this new innovation from traditional implants is that it does not require harvesting bone from the patient, and it is more flexible and compatible with tissues. Furthermore, it can be customized according to the shape of the fracture and gradually degrades as new bone forms.

If subsequent studies prove successful, this technology could pave the way for smart biocompatible implants that work in cooperation with the body instead of replacing part of it with solid materials. The potential result would be a more natural treatment, more stable healing, and a different future for orthopedic surgery.