Comments on 'repeated platelet concentrate injections enhance reparative response of microfractures in the treatment of chondral defects of the knee: An experimental study in an animal model' by Milano et al.

摘要

To the Editor:We read with deep interest the article by Milano et al. We appreciate their work in this study. In their valuable study, the histologic evaluation was performed with a modified O'Driscoll grading system, as shown in Table 3. However, we do have a question regarding this grading system. According to this grading system, the repair tissue with strong inflammation yields a higher score than that without inflammation. This is conflicting and incompatible with other variables of the grading system. We believe that such an important detail may have been overlooked by the investigators during the histologic evaluation of the sample. That is why the inflammation showed the lowest score in all observations of both groups in Tables 5 and 6.Therefore we think a corrigendum should be made; otherwise, the confusing grading system would mislead readers. Nonetheless, the flaw cannot lessen this article's complete value, and we thoroughly enjoyed reading the article with respect.