glenoid/supraspinatus/labrum?

about a month ago i had a fall on an outstretched arm snowboarding and since then, i've had ongoing shoulder pain that isn't really going away :-(

the most pain occurs during abducted external rotation and supinated lateral raise which is near impossible. i don't feel any instability in the joint at all.

i have had an ultrasound which has shown a ganglion, a sprain in the acromial joint and a small tear in the posterior labrum.

my physio says that these symptoms don't really add up, so my question is; what structures are involved in the above motions that could be injured and what is typical recovery time?

please let me know what you think :-)