Increased Risk of a Heart Attack Right After Joint Replacement Surgery

By Sondra Forsyth

Boston-based researchers found that osteoarthritis patients who had total knee or hip joint replacement surgery known as arthroplasty were at increased risk of heart attacks (myocardial infarction) in the early post-operative period. However, the good news is that long-term risk of heart attacks did not persist. Yet the not-so-good news is that the risk for venous thromboembolism — blood clots in veins and lungs — remained years after the procedure. The findings were published in August 2015 in Arthritis & Rheumatology, a journal of the American College of Rheumatology (ACR),

A release from the publishers explains that osteoarthritis is the most common form of arthritis, affecting 27 million Americans over the age of 25 according to the ACR. As the joint cartilage and bone deteriorates, knee or hip replacement surgery may be the only option to relieve pain and stiffness and restore mobility. Previous studies estimate that 1.8 million arthroplasty procedures are performed each year worldwide, and that number may increase as the population ages.

The release quotes lead study author Yuqing Zhang, D.Sc., Professor of Medicine and Epidemiology at Boston University School of Medicine in Boston, Massachusetts, as saying, “While evidence shows that joint replacement surgery improves pain, function, and quality of life for the osteoarthritis patient, the impact of cardiovascular health has not been confirmed. Our study examines if joint replacement surgery reduces risk of serious cardiovascular events among osteoarthritis patients.”

The present cohort study included 13,849 patients who underwent total knee replacement surgery and 13,849 matched controls who did not have surgery. Patients were 50 years of age or older and diagnosed with knee or hip osteoarthritis between January 2000 and December 2012.

Findings indicate that 306 patients in the arthroplasty group and 286 in the non-surgical group developed myocardial infarction during the follow-up period. Risk of heart attack was significantly higher during the first postoperative month in those who had knee replacement surgery compared to those in the non-surgical group, and gradually declined over time. Venous thromboembolism was a significant risk during the first month and over time for those having total knee or total hip arthroplasty.

“Our findings provide the first general population-based evidence that osteoarthritis patients who have total knee or total hip replacement surgery are at increased risk of heart attack in the immediate postoperative period,” concludes Dr. Zhang. “The long-term risk of heart attack was insignificant, but risk of blood clots in the lung remained for years after surgery to replace a hip or knee damaged by osteoarthritis.”