Anterior Cruciate Ligament Injury
A knee ligament injury caused by sudden direction changes in sports
The anterior cruciate ligament (ACL) connects the thighbone to the shinbone and keeps the knee stable.
When a sudden change of direction, stop, or pivot during sports puts too much force on the knee, the ACL can stretch, partially tear, or completely rupture.
It is most common in sports with frequent cutting and pivoting, such as soccer, basketball, rugby, and skiing.
A rapid pivot or deceleration while running places extreme stress on the knee
The body rotates faster than the knee can follow, creating a powerful twisting force
The ACL exceeds its limit and suffers a partial or complete tear
Without the ACL's support, the knee feels loose and may buckle (give way)
With conservative treatment, athletes work through a phased rehabilitation program. Strength recovery and knee stability must be thoroughly confirmed before returning to sport. The timeline varies depending on the sport and individual progress.
When Surgery May Be Considered
For athletes who need to return to high-demand pivot sports, or if the knee repeatedly gives way, ACL reconstruction surgery may be recommended. The ideal timing is after the initial swelling has settled.