Conclusion
The case of this patient showed that cell-free COL1 scaffold could provide a suitable matrix allowing for cellular repopulation and synthesis of a COL2 structure in an articular chondral defect of the knee. To determine the origin of these cells and how exactly they move into the scaffold, further investigations are needed.
Consent
Informed consent was obtained for taking the biopsy during arthroscopic treatment for the meniscal tear as well as for publishing the resulting data.