A long story short. Farina et al. conclude:
Contrary to current dogma, this study demonstrates that traditionally defined “meniscal” and “mechanical” knee symptoms are strongly associated with the burden and severity of underlying cartilage damage rather than with specific meniscal pathology.
It is only relevant to ask how could an arthroscopic partial meniscectomy be an effective procedure if there is not even clearly define patient group we should be treating with APM?