Another thing to consider with ACL / PCL is Medicare will not fund the use of ultrasound to investigate these structures. Personally I think this is logical and the patient is better off with an MRI investigation.
If a referral asks for assessment of knee ACL, PCL or meniscus it is not rebatable.
I am fearless in my advocacy and use of ultrasound in appropriate areas, bit also cognisant of when my modality is inappropriate.
Steve