Understanding how bone and tendons connect – implications for improving bioengineered applicationss
As a teenager your prized popstar poster didn’t just stick to the wall, it needed sticky tack to bridge between paper and plaster. Creating strong bonds between different materials, such as the soft tendons and hard bone of your shoulder’s rotator cuff, isn’t easy. This connection is hard to repair when injured, so researchers are investigating its structure. A study combined experiments, simulations, and new imaging techniques to examine the enthesis (pictured, artificially coloured to visualise the structure) at the join between tendons and bone and revealed a hidden fibrous material securing the connection. This adhesion balances overall toughness with individual strength, allowing a few fibres to break under strain if necessary to prevent the overall structure losing its grip. Understanding these mechanics could help surgeons ensure the full fibre structure repairs, and gives a new perspective for engineers combining contrasting materials.
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