Imagine being able to point your phone at your knee after a replacement surgery and instantly see how much stress your new joint is under. This technology could dramatically change the lives of many knee replacement patients, helping them avoid the complications that might lead to additional surgeries.
At Binghamton University, researchers are working hard to make this idea a reality. Professor Shahrzad “Sherry” Towfighian of the Mechanical Engineering Department has dedicated over ten years to developing “smart-knee” technology. Recently, she secured a $2.3 million grant from the National Institutes of Health to advance her research.
Every year, nearly 800,000 knee replacements are performed in the U.S., according to the American College of Rheumatology. This number is projected to surge by 2030 due to an aging population and increases in sports-related injuries.
“Ideally, implants should last a lifetime. Patients want to avoid revision surgeries, but about one in five experiences issues like loosening or imbalance,” Towfighian explains. “Currently, there are no internal sensors that can detect problems until it’s often too late. Our sensors could help spot these issues early.”
The key to this technology lies in sensors that convert the motion of the knee into energy. This energy could then power the sensors, allowing them to monitor stress on the joint continuously. According to recent studies led by Towfighian and her team, including PhD candidates Mahmood Chahari, Osama Abdalla, and Elham Mahmoudi, using materials that can generate energy from both pressure and motion is crucial. By combining triboelectric generation (which occurs when two surfaces rub against each other) with piezoelectric generation (which uses vibrations), they aim to create a highly responsive system.
“The energy we harvest will directly correlate to the load on the joint, effectively making our device both a sensor and a power generator,” says Towfighian. “Thanks to advancements in energy management systems, we can potentially create a self-powered sensor that operates on very little power.”
This ambitious project includes collaborations with researchers from Stony Brook University and Western University. They are currently testing their findings against a joint simulator developed by Associate Professor Ryan Willing, focusing on the complex movements of the knee.
As research progresses, the next step will involve testing these sensors on cadaver legs to confirm their safety and effectiveness. The hope is that these innovations will not only enhance current knee replacement procedures but could also improve the quality of life for countless patients in the future.
In a world where technology meets healthcare, advancements like these highlight the exciting possibilities for more personalized and effective medical solutions.
