Instrumented knee joint implants: innovations and promising concepts

Area of Science:

• Biomedical Engineering
• Orthopedic Surgery
• Medical Devices

Background:

• Knee replacement surgery is common, but complications like aseptic loosening and suboptimal joint function can occur.
• Current monitoring methods for knee implant performance and patient recovery are limited.
• Instrumented implants offer a potential solution for real-time biomechanical data acquisition.

Purpose of the Study:

• To analyze the evolution and in vivo implementation of instrumented knee implants.
• To compare the specifications and features of different instrumented knee implant architectures.
• To highlight innovative prototypes and their potential for improving knee replacement outcomes.

Main Methods:

• Review and analysis of three in vivo instrumented knee implant architectures implanted in 13 patients.
• Detailed examination of subsystem specifications: sensors, power management, communication, and processing units.
• Presentation and comparison of five novel prototype systems with enhanced capabilities.

Main Results:

• Three distinct in vivo instrumented knee implant architectures were successfully implanted and evaluated.
• Key subsystems (sensors, power, communication, processing) were analyzed and compared across different designs.
• New prototypes demonstrate advancements in ligament tensioning assistance and self-powering capabilities.

Conclusions:

• Instrumented active knee implants show significant promise for enhancing knee replacement success.
• These devices can aid in rehabilitation, assess implant placement and joint function, and predict aseptic loosening.
• The development of instrumented implants represents a key trend in advancing orthopedic surgery outcomes.