Hi Alexander,
I have never seen scar tissue act in this way for the supraspinatus tendon,
I certainly see scar tissue form as part of partial thickness tears, especially articular surface (rim rent) and intrasubstance delaminating tears.
But I have not observed large scale scar tissue formation inside full thickness tears.
Full thickness tear defects can be full of peri-bursa fat or haematoma in the acute setting, however this will be seen as a spongy area of soft tissue that will be expelled from the tear site with dynamic assessment.
I have not observed firm scar tissue replacing a tendon in a full thickness SST scenario.
I would be keen to see some images of full thickness SST tear scar in situ.
In my hands I have not seen scar tissue reconstitute the SST to “reseal” the rotator cuff and I have not observed reconstitution which prevents the flow of fluid from joint to bursa space following a full thickness tear.
None of this means it does not happen!
Just means I have not seen it.
I am very keen to see some images.
Steve