Is it possible to tear the ACL from a patellar dislocation?

Four years ago I was injured and was told I had a patellar dislocation, My doctor told me i had a slight lateral meniscus tear and a bone bruise and to do PT and I'd be fine. I found out halfway through this year that my ACL had been torn then (confirmed by retrieving my old MRIs) and had deteriorated.
Wouldn't an ACL tear require/result in a knee dislocation, not just patellar?

Note: i am aware of the rarity and difficulty of total knee dislocation, i just can't understand why displacing the knee cap could cause a tear in my ACL.
I hav had multiple dislocations since the first, but the original injury and MRI were together and I had never suffered any type of injury previous to cause such damage; I was only 15.

Many times a patellar dislocation is caused by a rotational or twisting injury. This is the same mechanics of injury that is common for an injury to the ACL. A tear of the ACL would not result in dislocation of the knee. This would involve many more structures of the knee and would be very obvious.

No. As a matter of fact, knee dislocations are rather rare. It is, however, possible that the ACL injury might have come at a different time, but I'd bet not.

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