By Joe Carlson joe.carlson@startribune.com
Thousands of patients who have osteoarthritis on one side of the knee end up having both sides of their femur bone drilled out and replaced with metal implants.
It's not that patients want to have more bone removed than they need to, or that a total-knee replacement pays better than a partial knee job. Rather it's often because properly balancing a knee after surgery on just one side is more challenging for a surgeon than doing both sides at once.
Now a Plymouth company called Blue Belt Technologies is using advanced robotics and 3-D modeling to improve orthopedic surgeons' precision with single-side knee resurfacing, known as unicompartmental knee replacement, or a "uni." The goal is to offer patients quicker and less-painful knee surgery and drive down hospital costs.
"If you look at orthopedics in general, there is a need for technology. There is a need to make things more consistent, more reproduceable and more efficient," said company CEO Eric Timko, a longtime medical device executive who took the reins at Blue Belt in 2011.
Unis serve as proof-of-concept for the Navio Surgical System, Blue Belt's $400,000 robotically assisted freehand bone drill and imaging system. Later this year, the company hopes to file an application with the Food and Drug Administration to expand its permitted uses to treat hip pain from femoroacetabular impingement. In 2016, the company may seek FDA clearance for a total-knee replacement indication.
Replacing lower-body joints is Medicare's most common procedure. The 446,148 cases of surgical replacement of hips, knees and ankles in 2013 cost Medicare $6.6 billion, more than any other single service, according to data released in June. Those figures don't include Medicare outpatient cases or procedures covered by private insurers.
"When we look at this huge baby boom population that is entering their 70s and 80s, the need for joint replacement is almost unfathomable," said Dr. Jay Kruse, an orthopedic surgeon who uses a Navio Surgical System at Twin Cities Orthopedics in Coon Rapids. "When we look at the impact that will have on health care dollars, it's unsustainable."