In vivo kinematics of the low contact stress rotating platform total knee.

The Rocky Mountain Musculoskeletal Research Laboratory uses in vivo video fluoroscopy to evaluate kinematics of total knee arthroplasty. This method allows us to evaluate in vivo weight bearing activity for a variety of knee designs, as well as kinematics of the normal knee. Our proprietary method of automated model fitting allows for three-dimensional analysis obtained from two-dimensional fluoroscopic images with minimal error. This article outlines the details of our kinematic analysis of the Low Contact Stress (LCS) Total Knee System (DePuy Orthopaedics lnc, Warsaw, Ind) rotating platform total knee and compares this design with fixed-bearing posterior cruciate-retaining and posterior cruciate-substituting total knee and normal knee kinematics.