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Rheumatology 2001; 40: 829-831
© 2001 British Society for Rheumatology

Letters to the Editor

Comment on ‘ultrasonic measurement of the thickness of human articular cartilage in situ’ by Yao and Seedhom

R. W. Mann

Mechanical Engineering, Room 3-137D, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA

SIR, In their abstract the authors say under Methods ‘The velocity of sound in articular cartilage was measured ...’, then under Results ‘the velocity of sound ... varied widely’, and in their Conclusion ‘The ultrasonic-pulse-echo is not accurate for the measurement of the thickness of cartilage in situ’ [1]. In fact, the authors never measured the velocity of sound in cartilage directly (my italics). Rather, the authors defined ‘A mesh ... drawn on the articular surface using a soft, felt-tipped pen’. Then, using a commercial ultrasonic device, ‘the transducer was pointed [manually?] perpendicularly to the articular surface’ at each mesh location. From the echoes from the cartilage surface and the cartilage–bone interface (no wave forms were shown), ‘the time period for . . . [Full Text of this Article]

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