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BIOMATERIALS Materials that Mend: Biomaterials Breakthroughs for Musculoskeletal Injuries Imagine injuring a limb and being able to regrow it, just like a salamander or certain lizards. Unfortunately, humans (and most mammals) don’t have that kind of superpower. When our bones fracture, our muscles tear, or our cartilage wears down, the body’s capacity to repair itself is limited. Even after healing, the new tissue is often weaker and less functional than it once was. That’s where biomaterial therapies come in. These are specially designed materials, ranging from as large as a screw to as small as a microscopic particle, that support the body’s natural healing processes. They can fill gaps, deliver drugs and stem cells, support new tissue growth, or provide mechanical strength during the healing process. For musculoskeletal injuries, these materials play a crucial role in helping patients regain normal movement and function. Biomaterials come in many forms. They may be metallic, like titanium screws and plates used to hold fractured bones in place. They may be ceramic, offering stiffness and wear resistance, for joint replacements. Alternatively, they may be made of polymers designed to mimic softer tissues, such as muscle. Size matters, too. Some biomaterials are visible to the unaided eye, such as scaffolds a few centimeters in length, which are implanted into damaged tissue. Others are nanomaterials, which are thousands of times smaller than a grain of sand. These materials can also carry a cargo of drugs and stem cells to boost healing at the site of injury. When it comes to treating musculoskeletal tissues, such as bone, cartilage, and muscle, mechanical properties are crucial. Each tissue has a distinct function and requires a specific balance of strength, flexibility, and toughness. For instance, bones are strong and stiff to support our weight. Cartilage is both tough and cushioned, allowing it to absorb shock in joints. Skeletal muscle is soft and stretchy, enabling us to move. Biomaterials must be engineered to match these unique properties. Otherwise, they risk failing or even becoming detrimental to the healing process.
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FAL L 2025