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Rheumatology Advance Access originally published online on October 29, 2003
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Rheumatology 2004; 43: 302-305
Rheumatology Vol. 43 No. 3 (c) British Society for Rheumatology 2003; all rights reserved

Basic Science

Can ultrasound predict histological findings in regenerated cartilage?

K. Hattori1, Y. Takakura1, Y. Morita2, M. Takenaka2, K. Uematsu1 and K. Ikeuchi2

1Department of Orthopaedic Surgery, Nara Medical University, 840, Shijyo-cho, Kashihara, Nara, 634-8522 and 2Institute for Frontier Medical Sciences, Kyoto University, 53 Shogoin Kawahara-cho, Kyoto, 606-8397, Japan

Correspondence to: K. Hattori, Department of Orthopaedic Surgery, Nara Medical University, 840, Shijyo-cho, Kashihara, Nara, 634-8522, Japan. E-mail: hattori{at}naramed-u.ac.jp

Objective. To evaluate regenerated articular cartilage quantitatively by introducing an ultrasonic probe into the knee joint under arthroscopy and analysing the A-mode echogram by means of wavelet transformation.

Methods. Three experimental rabbit models (spontaneous repair model, large cartilage defect model, treatment model) were examined using our ultrasonic evaluation system and a histological grading scale. From resulting wavelet map, the percentage of maximum magnitude was selected as the quantitative index of the ultrasonic evaluation system.

Results. The percentage maximum magnitude in the spontaneous repair model was 61.1%, that in the large defect model was 29.8% and that in the treatment model was 36.3%. There was modest correlation between the percentage maximum magnitude and the histological grading scale (r = -0.594)

Conclusion. Our findings indicate that ultrasound analysis can predict the microstructure of regenerated cartilage.


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K. Hattori, Y. Takakura, H. Ohgushi, T. Habata, K. Uematsu, M. Takenaka, and K. Ikeuchi
Which cartilage is regenerated, hyaline cartilage or fibrocartilage? Non-invasive ultrasonic evaluation of tissue-engineered cartilage
Rheumatology, September 1, 2004; 43(9): 1106 - 1108.
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