Joint Kinematics
A major focus of the research laboratory is the analysis of joint motion to determine the effect of various pathologies, rehabilitation methods, and surgical procedures on joint function. We have designed and employed a number of devices, where the relevant muscle actions are simulated using computer controlled pneumatic actuators and motion is measured using an electromagnetic tracking system. We have developed techniques to describe anatomical co-ordinate systems, surface topography of joints, and the relative motion of bones and joints. Studies to date have assessed the elbow, thumb, wrist, and knee.
The elbow testing apparatus, shown to the left, was developed in our laboratory. The "Flock of Birds" electromagnetic tracking system is used to measure the relative motion of the radius and ulna (i.e. the bones of the forearm) relative to the upper arm, or humerus. A variety of conditions of the elbow are investigated in the laboratory to determine their affect on joint motion pathways and joint stability.

Application of the "Flock of Birds" electromagnetic tracking system to measure the relative motion of the patellar component to the femoral component following knee arthroplasty.

Screw Displacement Axes (SDA) can be implemented to fully describe the motion between 2 bones.  SDA's are used in the graphic on the left to describe forearm movement between the radius and ulna.

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