Wireless sensors measure 3D force and torque data in human knee replacement

November 8, 2006 Historically, knee implants have been designed using predictions based on theoretical data. Now, a new smart knee replacement can wirelessly transmit multi-axis torque and force information directly from patients to a computer. These advances greatly enhance the capabilities of the first smart knee implant in 2004 that reported only knee compressive forces. The second generation implant provides a wealth of new information: twisting, bending, compressive, and shearing loads across the human knee - all reported dynamically and wirelessly. The data generated from this device will provide key inputs for new designs, techniques for implantation, and actual use of knee replacements. In-depth analysis can now be undertaken of forces and torques transmitted across the knee joint during normal human activities such as stair climbing, rising from a chair and walking. The results of this analysis can be used to improve design, refine surgical instrumentation, guide post-operative physical therapy and potentially detect the individual activities that would overload the implant.

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