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Probing Artificial Joints with Sound

August 3rd, 2007 Medgadget Editors Orthopedic Surgery

The details about this are not fully known yet, but engineers at the University of Bath in the UK claim that they developed some kind of ultrasound stethoscope-like device to listen to the squeaking of artificial joints to detect early signs of wear and tear:

The new method is much more sensitive than the traditional method of using x-rays to detect the loosening of implants, and so can diagnose much smaller gaps around the implanted joint…
Dr James Cunningham, of the University of Bath’s Department of Mechanical Engineering, has developed the method of placing a piece of vibrating equipment on to the patient’s knee, which vibrates the femur and the hip joint.
An ultrasound device is attached to the hip and this picks up sound vibrations from the vibrating joint. If the sound’s frequencies are ‘pure’ — a regular wave of increasing and decreasing frequencies — then they know the joint is firmly fastened to the bone. If the sound waves are impure and irregular then they know that the joint has come loose.
“This finding is important because surgeons need to know if the pain the patient is feeling comes from a loose joint needing surgery, or from another cause,” said Dr Cunningham.
“The ultrasound method is better than any other method available now, including the traditional x-ray procedure, which can only pick up a large amount of loosening.”
Dr Cunningham’s work will appear shortly in the journal Medical Engineering and Physics.
Dr Cunningham hopes that the NHS and other medical organisations will use his findings to develop the device for use in hospitals.

Press release: Engineers develop way of detecting problems with artificial hip joints …

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Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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