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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.
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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.
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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.
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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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