The damage may include tears of both cruciates, or one or more cruciates and a collateral - plus or minus one or more structures of the posterolateral corner (to the outer side of the back of the knee).
A multi-ligament instability is very much super-specialist territory. Remember than the KNEEguru website maintains a list of knee surgeons around the world.
Syndromes of complex instability include -
This particular multi-ligament knee injury has earned itself the infamous name of 'The unhappy triad of O'Donoghue'!
In fact much more common is -
This is a particular multi-ligament injury involving damage to the structures of the posterolateral corner -
The ACL is frequently also torn, in which case a Segond fracture (bony attachment of the lateral capsular ligaments torn off) may be apparent. This is definitely a condition requiring super-specialist attention.