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Published in: BMC Musculoskeletal Disorders 1/2016

Open Access 01-12-2016 | Research article

Weekly injections of Hylan G-F 20 delay cartilage degeneration in partial meniscectomized rat knees

Authors: Katsuaki Yanagisawa, Takeshi Muneta, Nobutake Ozeki, Yusuke Nakagawa, Mio Udo, Ryusuke Saito, Hideyuki Koga, Kunikazu Tsuji, Ichiro Sekiya

Published in: BMC Musculoskeletal Disorders | Issue 1/2016

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Abstract

Background

Cross-linked hyaluronan—also called Hylan G-F 20—is a medical device developed to treat osteoarthritis of the knee. However, it is still controversial whether Hylan G-F 20 has a cartilage protective effect in trauma-induced osteoarthritis. We investigated whether Hylan G-F 20 delayed osteoarthritis progression in a partial meniscectomized rat model.

Methods

Lewis rats were used for the experiments. The anterior medial meniscus was resected at the level of the medial collateral ligament in both knees. From 1 week after the surgery, 50 μl of Hylan G-F 20 was injected weekly into the left knee and phosphate buffered saline was injected into the right knee. Cartilage was evaluated for macroscopic findings, histology with safranin-o, and expression of type II collagen at 2, 4, and 8 weeks. Synovitis was also evaluated, and immunohistochemical analysis was performed for ED1.

Results

Macroscopic findings demonstrated that India ink positive area, representing fibrillated cartilage, was significantly smaller in the Hylan G-F 20 group than in the control group at 2, 4, and 8 weeks (n = 5). There were no significant differences in osteophyte score between the Hylan G-F 20 group and the control group at 2, 4, and 8 weeks.
Histologically, the cartilage in the medial tibial plateau was destroyed at 8 weeks in the control group, while type II collagen expression was still observed at 8 weeks in the Hylan G-F 20 group. OARSI score for cartilage histology was significantly lower in the Hylan G-F 20 group than in the control group at 4 and 8 weeks (n = 5). There were no significant differences in synovial cell number or modified synovitis score between the Hylan G-F 20 group and the control group at 2, 4, and 8 weeks (n = 5). In the Hylan G-F 20 group, foreign bodies surrounded by ED1 positive macrophages were observed in the synovium.

Conclusion

Weekly injections of Hylan G-F 20 starting 1 week after surgery delayed cartilage degeneration after meniscectomy in a rat model. Synovitis induced by meniscectomy was not alleviated by Hylan G-F 20. Insoluble gels were observed in the synovium after the Hylan G-F 20 injection.
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Metadata
Title
Weekly injections of Hylan G-F 20 delay cartilage degeneration in partial meniscectomized rat knees
Authors
Katsuaki Yanagisawa
Takeshi Muneta
Nobutake Ozeki
Yusuke Nakagawa
Mio Udo
Ryusuke Saito
Hideyuki Koga
Kunikazu Tsuji
Ichiro Sekiya
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2016
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-016-1051-6

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