ACL Injury. The anterior cruciate ligament (ACL) works together with the other ligaments in the knee to connect the femur to the tibia and support the knee joint. A tear in the ACL is one of the most common knee injuries, causing the joint to become unstable and slide forward too much.
There more than 6,000 games currently available on Steam. If it seems like there's a flood of new games on the digital distribution outlet pumped out each and every day that's because new and old developers and publishers are putting up titles all the time.
The game will be free for download until Dec. 26, 1PM EST. You can download it from Steam by going to the Left 4 Dead 2 page and clicking 'Install game.' Steam's servers are currently overwhelmed with the demand, though, so don't be surprised if you have to wait a bit until you actually get the game.y Stan Schroeder. Valve has a special Christmas gift for Steam users: a free copy of its zombie survival shooter, Left 4 Dead 2. The game, which is available for Windows, Mac OS X and Linux, puts you in the shoes of a survivor in a zombie apocalypse.