Abstract
Purpose
Adequate graft fixation over a certain time period is necessary for successful cartilage repair and permanent integration of the graft into the surrounding tissue. The aim of the present study was to test the primary stability of a new cell-free collagen gel plug (CaReS®-1S) with two different graft fixation techniques over a simulated early postoperative period.
Methods
Isolated chondral lesions (11 mm diameter by 6 mm deep) down to the subchondral bone plate were created on the medial femoral condyle in 40 porcine knee specimens. The collagen scaffolds were fixed in 20 knees each by press-fit only or by press-fit + fibrin glue. Each knee was then put through 2,000 cycles in an ex vivo continuous passive motion model. Before and after the 2,000 motions, standardized digital pictures of the grafts were taken. The area of worn surface as a percentage of the total collagen plug surface was evaluated using image analysis software.
Results
No total delamination of the scaffolds to leave an empty defect site was recorded in any of the knees. The two fixation techniques showed no significant difference in worn surface area after 2,000 cycles (P = n.s.).
Conclusions
This study reveals that both the press-fit only and the press-fit + fibrin glue technique provide similar, adequate, stability of a type I collagen plug in the described porcine model. In the clinical setting, this fact may be particularly important for implantation of arthroscopic grafts.
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Acknowledgments
The authors wish to thank Dr. Karsten Gavenis, Department of Orthopaedic Surgery, University Hospital Aachen, Germany, and Professor Ulrich Schneider, Arthro Nova Clinic, Tegernsee, Germany, for providing the laboratory facilities, as well as Dr. Johanna Schmitt, Marburg, Germany, for editing the manuscript and for help with the English language.
Conflict of interest
TE, MDS, and TJH are consultants to Smith & Nephew, Arthroscopy, Germany. There is no financial interest related to this research.
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Efe, T., Füglein, A., Heyse, T.J. et al. Fibrin glue does not improve the fixation of press-fitted cell-free collagen gel plugs in an ex vivo cartilage repair model. Knee Surg Sports Traumatol Arthrosc 20, 210–215 (2012). https://doi.org/10.1007/s00167-011-1571-4
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DOI: https://doi.org/10.1007/s00167-011-1571-4