Predict Knee Surgery Success with Urine Test

A research team at the University of Missouri is working to predict which patients will benefit most from a specific type of cartilage transplant surgery, and some of the best clues may lie in patients' urine.

In a recent study, a Mizzou team led by Jimi Cook, Ph.D., discovered that patients with high levels of nine specific proteins—found through collecting urine samples—were far less likely to have successful results from a knee procedure known as an osteochondral allograft transplantation, where damaged cartilage is replaced with healthy tissue from a donor. It is a procedure that uses biological solutions to preserve a patient's natural joint rather than artificial metal or plastic joint replacements.

The study is published in The Journal of Knee Surgery.

This discovery could help patients with knee pain make more informed decisions about when and what type of surgery is likely to work best for them.

"While most knee surgeries are successful, I ultimately want all of them to be successful," said Cook, the William and Kathryn Allen Distinguished Chair of Orthopedic Surgery in the School of Medicine. "By better understanding which protein biomarkers are linked with unsuccessful outcomes, we can determine the best data-driven treatment plan for each individual with knee pain before doing any invasive procedures. To me, that's what precision medicine is all about."

Levels of protein biomarkers in our urine are not set in stone for life; they fluctuate with age and other factors. A urine sample showing that a patient would not be a good candidate for a cartilage transplant surgery at one moment in time doesn't mean surgery is off the table forever. This flexibility underscores Cook's belief that solutions for orthopedic problems should be tailored to each patient.

"Whether we are treating a professional athlete wanting to compete again or a grandparent wanting to safely and comfortably play with their grandkids, we genuinely care about helping people from all walks of life," Cook said.

Cook came to Mizzou as a student in 1990 before joining the faculty in 1998. In 2013, he joined the Missouri Orthopedic Institute and since then, he and his colleagues have helped thousands of patients with joint pain decide on an optimal treatment plan based on their life goals by taking a holistic approach to patient-centered care and evidence-based, shared decision-making.