Rider Jen

Good for you that you now have what seems to be a definite diagnosis. Your ortho specialist is right in prescribng scapular control exercises prior to any shoulder exercises.
The question you should as yourself however is why did you have this problem in the first place. The anatomical site of your injury suggests you have a narrowing there already. Is this narrowing anatomic or due to insufficient scapulohumeral rythm?

I ask these questions only because, it would be a shame to go through all this trouble only for this same problem to reoccur...your age suggests that you might be susceptible to arthritic changes gradually..if all you did was raise your arm up and this problem occurred and its taking it more than two months for it to resolve...then possible the tendons are being stranguled. they are lacking oxygen and are changing in their physiologic properties. This problem is not a new problem, its something that has gradually happened over the years without you knowing...

before you start any scapular exercises, i would humbly suggest you get the opinion of your surgeon/specialist with regards any arthritic changes that might be causing the sspace underneath the acromion to be small... they should compare both your shoulders, if its not arthritic...your physiotherapist may want to reassess your scapulohumeral rythmn/ as well as any muscle imbalances and intraarticular motions of your shoulder joint properly. He/she should compare it to the other shoulder...

Its one thing to know the tissue damaged...we should ask why this happened? what do we need to do to stop it from happening again...