No not really rare, it's pretty common for footballers when you consider that it comes from twisting and turning impact on the knee, which you will always see on a football pitch. You have high profile players such as Owen, Pires, van Nistelrooij, Baggio, Del Piero, Heinze, Shearer, Arteta, Walcott, Ramsey, Falcao, Lahm, I'm sure I'm missing many more examples with the same injury. In the PL alone six players suffered the injury just this season - Ings, C. Wilson, J. Gomez, Krul, Mings and Gradel.
Have a read of this article:
http://www.dailymail.co.uk/sport/fo...-boots-experts-claim-unhappy-coincidence.html
Guess what boots Marchisio wears?