Smart hip implants
Smart hip implants
Total hip implants are being placed in more patients than ever before, with numbers increasing yearly. As implants are increasingly given to younger, more active patients with longer life expectancy, the risk of failure increases. Infection and aseptic loosening are the main causes of hip implant failure and are difficult to detect at an early stage. Current diagnostic methods are often initiated after symptoms appear, delaying treatment and often complicating revision surgery.
The thesis of Helene Noordhuis explores smart hip implants, implants equipped with integrated sensors, to facilitate earlier detection of hip implant failure. A review of 49 biomedical sensors and a stakeholder analysis identified several types of sensors capable of continuously measuring indicators of failure. Among these, acidity (pH) and reactive oxygen species (ROS) sensors emerged as promising and underdeveloped options.
To evaluate their potential, the two types of sensors were tested in controlled laboratory environments designed to represent conditions surrounding a hip implant. Both demonstrated potential for detecting biochemical changes associated with infection and the underlying cause of aseptic loosening: inflammation. The tests also revealed challenges related to sensor performance in the complex hip environment.
While technical, biological, and data safety related challenges remain, this work demonstrates that biochemical sensing in hip implants is both feasible and clinically meaningful. It outlines a pathway toward smart hip implants capable of continuously monitoring, enabling earlier failure detection and targeted clinical intervention, transforming long term patient outcomes.