Smith and O'Brien also stated that Clowney is coming along well after undergoing microfracture knee surgery on December 8 due to significant cartilage damage and a torn meniscus. Dougherty noted that Clowney's rehab was taking place in Houston and that he is right on track through the first six weeks of the treatment. http://www.sbnation.com/nfl/2015/2/19/8049949/houston-texans-jadeveon-clowney-injury