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Etiology of Rotator Cuff Tears:

- Discussion:
    - rotator cuff anatomy:
- frequency of RTC
- diff dx of cuff tears: (partial rotator cuff tear)
- how do RTC tears heal?
- tendon fibrocartilage metaplasia

- impingement syndrome: (75%)
- shoulder instability (anterior or multi-directional) (15%) (should be considered in any young active patient);
- trauma:
- occurs in 10% of patients;
- note that a displaced greater tuberosity frx is a RTC tear equivolent;
- references:
- Tears of the rotator cuff of the shoulder associated with pathological changes in the acromion. A study in cadavera.
- Position of the humeral head and rotator cuff tear: an anatomical observation in cadavers.
- The effect of glenoid cavity depth on rotator cuff tendinitis

Biomechanics critical in understanding different types of rotator cuff tear

Effect of tendon release and delayed repair on the structure of the muscles of the rotator cuff: an experimental study in sheep.

Subacromial pressures vary with simulated sleep positions.

Supraspinatus tendon composition remains altered long after tendon detachment

Fibrous cartilage in the rotator cuff: a pathogenetic mechanism of tendon tear?

Proteoglycans of human rotator cuff tendons

Re-attachment of a Tendon to the Calcified Fibrocartilage Layer

Rotator cuff repair with periosteum for enhancing tendon–bone healing: a biomechanical and histological study in rabbits

Aging of the rotator cuff

Relationship of Tear Size and Location to Fatty Degeneration of the Rotator Cuff