Reports say the injury occurred while Exum was playing for his native Australia in an exhibition game, but the type and extent of the injury is still unclear.

One common injury to athletes is the tearing of the anterior cruciate ligament (ACL). The ACL connects the front top of the tibia (the lower leg bone), to the rear bottom of the femur (the thigh bone). It typically can be successfully repaired with surgery.

For those with questions about knee injuries, here are a few resources from Intermountain Healthcare:

Knee ligament injures – http://healthlibrary.intermountainhealthcare.org/Library/Encyclopedia/85,P00926

Knee pain and problems –

http://healthlibrary.intermountainhealthcare.org/Library/Encyclopedia/85,P00923