Abstract
Purpose
To investigate the clinical, radiological, and histological results of arthroscopic gel-type autologous chondrocyte implantation (GACI) in treating chondral defects of the knee.
Methods
This study prospectively examined five males and five females with a mean age of 40.3 ± 10.3 years who underwent arthroscopic GACI between March 2012 and February 2013. The gel comprised a mixture of 1 ml of fibrinogen plus 0.1–0.2 ml of thrombin. The mean size of chondral defect was 2.9 ± 1.2 cm2 (range 1.2–5.4 cm2). International knee documentation committee (IKDC) subjective score, knee injury and osteoarthritis outcome score (KOOS), knee society score, and visual analog scale (VAS) for pain were assessed preoperatively and during regular follow-up examinations performed for up to 5 years postoperatively. Serial magnetic resonance imaging was performed for up to 2 years after the surgery to observe healing, using the modified magnetic resonance observation of cartilage repair tissue (MOCART) score. In eight patients, second-look arthroscopy was performed at 1 year after the implantation to assess the status of treated cartilage, and a portion of regenerated cartilage was harvested for histologic evaluation.
Results
The mean VAS score (p = 0.045), IKDC subjective score (p = 0.041), KOOS pain (p = 0.025), KOOS activities of daily living (p = 0.048), and KOOS quality of life (p = 0.029) showed significant improvement at 5 years after the surgery. The modified MOCART evaluation showed that the scores were 59.5 ± 29.4 and 85.0 ± 8.0 at 12 weeks and 2 years after the operation, respectively. Histologic examination demonstrated a mean regenerated cartilage thickness of 3.5 ± 0.8 mm and a mean Oswestry score of 8.2 ± 1.8. Immunohistochemistry analysis showed that the expression of collagen type II was more evident and more evenly distributed than collagen type I in regenerated cartilage. There was a significant correlation between Oswestry score and change in VAS scale from postoperative 2–5 years.
Conclusions
Arthroscopic GACI produces satisfactory clinical and radiologic outcomes, and histologic evaluation confirms sufficient regeneration of hyaline-like cartilage that correlates with improved symptoms. Therefore, it is an acceptable, minimally invasive, and technically simple option for the restoration of cartilage defects of the knee.
Level of evidence
IV.
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Abbreviations
- GACI:
-
Gel-type autologous chondrocyte implantation
- IKDC:
-
International knee documentation committee
- KOOS:
-
Knee injury and osteoarthritis outcome score
- VAS:
-
Visual analog scale
- MOCART:
-
Magnetic resonance observation of cartilage repair tissue
- ACI:
-
Autologous chondrocyte implantation
- MACI:
-
Matrix-induced autologous chondrocyte implantation
- ICRS:
-
International cartilage repair society
- KSS:
-
Knee society score
- MRI:
-
Magnetic resonance imaging
- ACL:
-
Activities of daily living
- QOL:
-
Quality of life
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Funding
This study was supported by a grant from Sewon Cellontech, and was approved by the IRB of Yonsei University College of Medicine.
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The project was coordinated by TH Yoon, SJ Kim, and SH Kim. TH Yoon drafted the manuscript, together with M Jung, HS Kim, YS Choi, CH Choi, and YH Lee. SH Kim generated the concept of the study. The design of the study, acquisition of data, analysis and interpretation of data were all done jointly by all authors. SJ Kim, HS Kim, and SH Kim revised the final draft critically for important intellectual content, and approved the version to be submitted. All of the authors agreed to be accountable for all aspects of the work to make sure that any questions related to its accuracy or integrity are appropriately investigated and resolved.
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Prior to the study, we received approval from our institutional review board (IRB number:4-2012-0618).
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Informed consent was obtained from all patients before their enrollment in the study.
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Supplement 1. Histologic results of eight patients who underwent biopsy during second-look arthroscopy, and MR images taken before surgery and at postoperative year 2.
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Yoon, TH., Jung, M., Choi, CH. et al. Arthroscopic gel-type autologous chondrocyte implantation presents histologic evidence of regenerating hyaline-like cartilage in the knee with articular cartilage defect. Knee Surg Sports Traumatol Arthrosc 28, 941–951 (2020). https://doi.org/10.1007/s00167-019-05572-6
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DOI: https://doi.org/10.1007/s00167-019-05572-6