الفهرس 
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Abstract
Rotator cuff injury is a common cause of shoulder pain in people of all age groups. They represent a spectrum of disease, ranging from acute reversible tendinitis to massive tears involving the supraspinatus, infraspinatus, and subscapularis. Diagnosis is usually made through detailed history, physical examination, and often, imaging studies.
However, any impingement inherently involves two bony structure many studies done to clear the relationship between acromion morphology and RCTS but less studies done to clear the relationship between humerus greater tuberosity morphology, position and RCTs.
Greater tuberosity angle (GTA) was introduced first in 2018 as a new predictor of RCTs, the angle is made by two lines, first line which pass through center of humeral head and parallel to diaphysis of the humerus and second line which is made by connection of the most superolateral edge of greater tuberosity and upper border of the humeral head(20).
Our study was done in Menoufia University hospitals in 94 pts divided in case group with degenerative RCTs and control group with other shoulder pathology to evaluate relation between greater tuberosity angle and degenerative rotator cuff tears.
The main results of the study revealed that:
There were significant difference between both groups as regard age, case group (52.4 ±10.1) and control group (35.4 ±10.1).
There were insignificant difference between both groups as regard weight or BMI.
There were insignificant difference between both groups as regard Affected side, Dominance or Dominant side affected in case group 62% and control group 70%.
There were high significant difference between both groups as regard Localized tenderness 70% of case group and 38% of control group.
There were significant difference between both groups as regard Wasting 58% of case group and 32% of control group.
There were high significant difference between both groups as regard abduction ranging from 50 to 70 degree in case group and from 140 to 180 in control group.
There were high significant difference between both groups as regard Greater tuberosity angle as in case group (72.5 ± 2.5) and in control group (65.2 ± 4.1).