Self-powered sensors could increase life span of knee implants

Assistant professor Sherry Towfighian received a grant from the National Institutes of Health to begin work on a smart implant that could drastically reduce the number of knee replacement surgeries.

Knee replacement surgery is one of the most common bone surgeries in the United States, yet the average implant will only last about five years. Increasingly, this surgery is being performed for younger, more active patients who are faced with a dilemma. When they undergo the surgery, they are expected to remain physically active for their overall health, but that activity can also wear down the new implant. Often, doctors don’t know if patients are overexerting themselves until they begin to develop symptoms. By that point, the damage to the implant has already been done. For a young patient, going through knee replacement surgery every five years is a daunting task, but finding the perfect balance of activity levels to maintain the integrity of the implant has been equally daunting.

Snip20171005_15Assistant professor Sherry Towfighian from the Thomas J. Watson School of Engineering and Applied Science is working on a solution. She is the lead principle investigator on a study titled “An implantable self-powered load sensor for total knee replacement health monitoring” along with other principle investigators Ryan Willing from Western University and Emre Salman from Stony Brook University. The study recently received a grant of more than $200,000 from the National Institutes of Health.

The proposal involves the creation of a unique type of implant with sensors that can monitor activity. “The implant will be able to tell doctors when a patient has exerted too much pressure before the symptoms start to show up,” said Towfighian. “If the doctor is able to adjust the patient’s activity levels before there is damage, the implant will last much longer than the typical five years.”

These smart implants will not only give feedback to doctors, but will help researchers like Towfighian in the development of future implants. “The sensors will tell us more about the demands that are placed on implants. With that knowledge, we can start to improve the implants even more,” said Towfighian.

However, building the sensors into the implant is not enough to solve the problem. Towfighian explained that, “while sensors can help elongate the life of a knee implant, a battery-operated sensor would mean that doctors would still be faced with the need to perform regular surgeries to replace the battery.” That’s why the study won’t stop at just making an implant with sensors, it also aims to create one that can be self-powered.

By Rachael Flores | Binghamton University

Image Credit: Rachael Flores / Binghamton University


About Peter Coffaro 603 Articles
A growth-driven and strategic executive, Peter Coffaro commands more than 20 years of progressive management success within the medical device industry. As a District Sales Manager for Stryker Orthopaedics, Peter was responsible for managing and directing a regional sales force to achieve sales and profit goals within the Rocky Mountain region. Previously, he was the Director of Sales & Marketing for Amp Orthopedics. In this role, Peter was responsible for planning, developing, and leading all sales and marketing initiatives. Peter is a former orthopedic distributor in the Pacific Northwest. He has also worked with DePuy Orthopaedics as well as Zimmer, and held positions in sales, sales training, and sales management. Peter has an extensive background in organizational development, business development, sales management, negotiating and P&L management. Peter holds a B.S. degree in Biology from Northern Illinois University.

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