Scientists have developed a material that can mimic cartilage and potentially encourage it to re-grow.
Compared to other types of connective tissue cartilage is not easy to repair. Researchers have developed a bio-glass material that mimics the shock-absorbing and load bearing qualities of real cartilage. It can be formulated to exhibit different properties, and they are now hoping to use it to develop implants for replacing damaged cartilage discs between vertebrae. They believe it also has the potential to encourage cartilage cells to grow in knees, which has previously not been possible with conventional methods.
The bio-glass consists of silica and a plastic or polymer called polycaprolactone. It displays cartilage-like properties including being flexible, strong, durable and resilient. It can be made in a biodegradable ink form, enabling the researchers to 3D print it into structures that encourage cartilage cells in the knee to form and grow – a process that they have demonstrated in test tubes. It also displays self-healing properties when it gets damaged, which could make it a more resilient and reliable implant, and easier to 3D print when it is in ink form.
The team are aiming to ‘print’ tiny, biodegradable scaffolds using their bio-glass ink. These bio-degradable scaffolds would provide a template that replicates the structure of real cartilage in the knee. When implanted, the combination of the structure, stiffness and chemistry of the bio-glass would encourage cartilage cells to grow through microscopic pores. The idea is that over time the scaffold would degrade safely in the body, leaving new cartilage in its place that has similar mechanical properties to the original cartilage.
Professor Julian Jones said: “Bio-glass has been around since the 1960’s, originally developed around the time of the Vietnam War to help heal bones of veterans, which were damaged in conflict. Our research shows that a new flexible version of this material could be used as cartilage-like material. “Patients will readily attest to loss of mobility that is associated with degraded cartilage and the lengths they will go to try and alleviate often excruciating pain. We still have a long way to go before this technology reaches patients, but we’ve made some important steps in the right direction to move this technology towards the marketplace, which may ultimately provide relief to people around the world.”
They are aiming to conduct trials in the lab with the technology and develop a surgical method for inserting the implants. They will also work with a range of industrial partners to further develop the 3D manufacturing techniques.
Professor Cobb added: “Today, the best performing artificial joints are more than a thousand times stiffer than normal cartilage. While they work very well, the promise of a novel class of bearing material that is close to nature and can be 3D printed is really exciting. “Using Julian’s technology platform we may be able to restore flexibility and comfort to stiff joints and spines without using stiff metal and all its associated problems.”
Professor Laura Cipolla added: “Based on our background on the chemical modification of bio- and nanostructured materials, proteins, and carbohydrates, we designed a new chemical approach in order to force the organic component polycaprolactone to stay together in a stable way with the inorganic component silica.”
The team predict it will take 10 years to for both technologies to reach the market. They have patented the technology with Imperial Innovations. http://www3.imperial.ac.uk/newsandeventspggrp/imperialcollege/newssummary/news_12-5-2016-9-57-13
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