1) Subacromial impinegment (External impingement)
● Exccssive superior translations with rotator cuff weakness during arm elevation
● Bursitis sid
● Severe pain
2) Internal impingement
● At ABER position(90-90 position)
Intra- articular impingemetn
● Posterio-superior rotator cuff contacts the postero-superior glenoid labrum and pinched between the labrum and GT
● Articular side layer is more vulnerable to a tensile load than the bursal side layer.
● Especially, tear of posterior supraspinatus and anterior infraspinatus tendon.
Classification of patial tears
FTRCT (full thickness rotator cuff tear)
▷ Rotator cuff full thickness tear(supraspinatus complete tear)
▷ Concomitant infraspinatus tear 40%
▷ Concomitant subscapularis tear 30~70%
Reference
CBD Wellness Centre Feb 1, 2019
Difference between Rotator Cuff Tear and Sub Acromial Impingement Syndrome
Arthroscopic classification of partialthickness rotator cuff tears according to Ellman [32 Last Updated on Wed, 16 Dec 2020 | Rotator Cuff
Musculoskeletal Evidence based Treatment