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Excellent histological results in terms of articular cartilage regeneration after spheroid-based autologous chondrocyte implantation (ACI)

Artikel i vetenskaplig tidskrift
Författare D. Grevenstein
A. Mamilos
V. H. Schmitt
T. Niedermair
W. Wagner
Charles James Kirkpatrick
C. Brochhausen
Publicerad i Knee Surgery, Sports Traumatology, Arthroscopy
ISSN 0942-2056
Publiceringsår 2020
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för biomaterialvetenskap
Språk en
Länkar dx.doi.org/10.1007/s00167-020-05976...
Ämnesord Autologous chondrocyte transplantation, Cartilage, Chondrocytes, MACI, Spheroids
Ämneskategorier Klinisk medicin

Sammanfattning

Purpose: Traumatic lesions of articular cartilage represent a crucial risk factor for osteoarthritis. Even if several strategies exist to treat such damages, the optimal solution has not yet been found. A new strategy represents the scaffold-free spheroid-based autologous chondrocyte transplantation. In this method, spheroids of chondrocytes are synthesized after chondrocyte isolation and expansion, followed by the implantation in a second intervention. Methods: Fine Jamshidi-needle biopsies from five patients (one from each patient, Ø 2 mm) treated with a spheroid-based autologous chondrocyte implantation (ACI) after traumatic lesions of the articular cartilage of the knee were analysed histologically and immunohistologically for collagen II, collagen X and aggrecan expression. The indication for a second look arthroscopy was given by arthrofibrosis or meniscus-lesions, respectively. The time between ACI and second-look arthroscopy ranged between 6 and 16 months. Results: In all patients, the histological examinations revealed an avascular cartilage tissue with a homogenic extracellular matrix. The subchondral bone neither showed bleeding, necrosis nor hypertrophy. A homogenous alcian blue staining indicated high amounts of mucopolysaccharides and glycosaminoglycans. Collagen II staining was highly positive, whereas collagen X staining was negative in every patient, ruling out hypertrophic chondrocyte differentiation. In addition, intense aggrecan staining indicated a strong expression of this extracellular matrix component. Conclusion: The present case series represents the first histological and immunohistological analyses of spheroid-based ACI in humans. Spheroid-based ACI revealed excellent histological results regarding the regeneration of hyaline articular cartilage. These results indicate that spheroid based ACI is a promising strategy for treating traumatic lesions of the articular cartilage of the knee. © 2020, The Author(s).

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