Surgery – Truss – Pad
Patent
1988-07-18
1990-12-11
Howell, Kyle L.
Surgery
Truss
Pad
12866002, 128774, A61B 1000
Patent
active
049762672
ABSTRACT:
A method of determining in vivo an estimate of the modulus of elasticity of a bone. The method including the steps of applying an ultrasound beam to a limb from a transmitting transducer to a receiving transducer, and then measuring the flight times, T.sub.s for an ultrasound beam along a first path through the cortex of the bone, and T.sub.m along a second path through the cortex and medulla of said bone. After performing these steps, the method calculates the diameter X of the bone from the external diameter of the limb minus a predetermined constant allowing for skin and flesh, calculates the apparent velocity C.sub.a from X divided by T.sub.s, calculates the mean velocity V from X divided by T.sub.m, and calculates the cortical bone velocity C.sub.bE from a predetermined function f multiplied by C.sub.a. Next, the method determines a ratio R for the diameter of the medulla to the diameter of the cortex and then estimates the cross-sectional area CSA.sub.E of the bone from the values of the diameter X, the ratio R and from predetermined constants. From these derivations, the bone mineral content, BMC, the estimated compact bone density, CBD.sub.E, and an estimate of the modulus of elasticity from the product of CBD.sub.E and C.sub.bE are determined.
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Jeffcott Leo B.
McCartney Ronald N.
Howell Kyle L.
The University of Melbourne
Zele John D.
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