- A feeling of initial instability, followed by extensive swelling.
- Pain immediately after sustaining the injury.
- There may be an audible pop or crack at the time of injury
- Inability to fully straighten the leg
- Possible widespread mild tenderness
Anterior Cruciate Ligament (ACL) Injuries
The anterior cruciate ligament (ACL) is one of the four main ligaments in the knee. It binds the back of the thigh bone (femur) to the front of the shin bone (tibia) and prevents the knee from moving excessively in relation to the femur. If the ACL is damaged the knee becomes unstable and feels like if it is "giving out". ACL injury is very common in hockey, skiing, skating, football and basketball due to the amount of pressure, weight and blows the knee withstands during these sports. Women in contact sports such as football and soccer are significantly more vulnerable to ACL injuries because of the difference in the anatomy of the knee. The symptoms of an ACL injury are: