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Pavl0009@gold.tc.umn.edu
06-03-1994, 12:41 AM
We're using Tekscan K-Scan sensors to measure intra-articular
(t-f and p-f) pressures in cadaver knees. We dynamically load the
knees on a 6 dof knee simulation machine with pneumatic muscle loads. The
sensors inserted in the joints are exposed to body fluids and a wide range
of physiologic loads, including shear forces.

Our concerns regarding these sensors include durability, hysteresis,
accuracy, and repeatability. We have done tests to characterize all
of the above. Our main concerns presently are anchoring and locating the
sensors relative to the tibia and implant (PCL retaining). This is
especially difficult for the natural knee, in which the ligaments must be
left intact and access is difficult. I would appreciate input from those
of you who have inserted any type of sensor in a joint. 1. How did you
attach the sensor? Would this method work well for a dynamic loading
situation in which the sensor must not move relative the the reference
bone? 2. How did you locate the sensor relative to the bone (or implant)?

Thanks for your input. It may be most appropriate to respond to me
directly, in which case I will summarize the responses.

Jenny Pavlovic, MSME, PE
Research Engineer
Orthopaedic Biomechanics Lab
Hennepin County Medical Center
Minneapolis, MN