Cruciate Ligament Injuries
The anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL) work together to provide stability in the knee. They cross each other and form an 'X.'
Injuries to the cruciate ligaments of the knee are typically sprains. The anterior cruciate ligament is most often stretched, or torn by a sudden twisting motion while the feet remain planted. The posterior cruciate ligament is most often injured by a direct impact, such as in soccer or football.
ACL partial or complete tears can occur when an athlete changes direction rapidly, twists without moving the feet, slows`down abruptly, or misses a landing from a jump
See ACL - degree of injury slide
PCL injuries (image) are likely with impacts to the front of the knee, or from hyperextending the knee.
Cruciate ligament injuries don't always cause pain, but typically cause a loud "pop."
Incomplete tears are treated conservatively to allow the body to hear on its own. Rest, ice, compression and elevation are the immediate treatment. Nsaids can help reduce pain. Physical therapy will be used to build muslce strength over time. For a complete tear of the ACL Arthroscopic surgery is usually performed.