The<unk><unk><unk>  (ACL) is a<unk>  in the center of the knee that prevents the shin bone (tibia) from moving forward on the thigh bone (femur). An<unk><unk><unk>  (ACL)<unk>  is the over-stretching or tearing of the<unk><unk><unk>  in the knee. A tear may be partial or complete.
Anterior cruciate ligament injury
Tear of meniscus
Iliotibial band syndrome
Knee dislocation
Medial tibial stress syndrome
Prepatellar bursitis
Olecranon bursitis
Chondromalacia patellae