RESEARCH ARTICLE


Near-Infrared Spectroscopy Correlates with Established Histological Scores in a Miniature Pig Model of Cartilage Regeneration



Daniel Guenther 1, Chaoxu Liu 1, Hauke Horstmann 1, Christian Krettek 1, Michael Jagodzinski 1, Carl Haasper*, 1, 2
1 Trauma Department, Hannover Medical School (MHH), Hannover, Germany
2 Orthopaedic Department, HELIOS-ENDO-Klinik Hamburg, Hamburg, Germany


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© Guenther et al.; Licensee Bentham Open.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.5/) which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.

* Address correspondence to this author at the Orthopaedic Department, HELIOS ENDO-Klinik, Hamburg, Germany; Tel: +49 40 3197 0; Fax: +49 40 3197 1966; E-mail: carl.haasper@helios-kliniken.de


Abstract

Near-Infrared Spectroscopy (NIRS) could be of clinical relevance in modern cartilage regeneration.In a miniature pig model correlation of measurements and histologic scores have never been used before. The data analysis was part of an animal project that investigated the effects of seeding a chondrogenic and osteogenic scaffold with a bone-marrow-derived cell concentrate and reports the histological and mechanical properties. We created 20 osteochondral defects in the femoral condyles of 10 miniature pigs.The defects were left empty (E), filled with the grafted cylinder upside down (U), or with a combined scaffold (S) containing a spongy bone cylinder covered with a collagen membrane. In the fourth group, the same scaffolds were implanted but seeded with a stem cell concentrate (S+BMCC). The animals were euthanized after 3 months, and histologic and spectrometric analyses were performed. NIRS measurements were significantly higher in the central area of the defects of group S+BMCC compared to the central area of the defects of group U. In all groups, a correlation between NIRS and the histologic scores could be demonstrated though on different levels. In the central area, a good NIRS measurement correlates with low (good) histologic scores. In group E and group S, this negative correlation was significant (p=0.01). For the first time, NIRS was successfully used to evaluate osteochondral constructs in a miniature pig model.

Keywords: Cartilage, miniature pig, near-infrared spectroscopy, NIRS, steochondral lesion, Pineda, Wakitani..