Do i need surgery for fluid in the subcromial/subdeltoid bursa and a high grade partial thickness articulare sided tear supraspinatus tendon?

Varies: Full thickness tears of the rotator cuff will often retract and not heal; so if someone is young and reasonably active surgery usually optimizes outcome. Partial tears can heal at times without surgery. A high grade partial tear is very close to a complete tear; you would certainly want to be followed closely by an orthopedic surgeon to discuss your progress.