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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

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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