According to the Houston Chronicle, B-Mac has a knee

[TXDawg]

Link:

http://blog.chron.com/ultimatetexans/2015/08/texans-rookie-benardrick-mckinney-has-sprained-mcl-sources-say/

Calling it a mild MCL sprain. Hope he recovers soon.

[MetEdDawg]

Tore my ACL/MCL back in April of last year. The MCL part is what has made my recovery so damn difficult. Hopefully this doesn't linger for him and he can get it healed and be good to go for the year. Think he's got a chance to be really solid for them.