HI John,
Indeed this is possible,
The approach is from the lantern-lateral aspect lining up the proximal tibia and fibula.
It is an out of plane injection technique,
There is a published article which I will try and find for you,
I have a screen shot of the transducer position, needle orientation and resulting ultrasound image from the article in my teaching material. I have attached this image for you to look at.
Steve.