Shoulder Anatomy. Shoulder. It is a ball and socket joint that moves in all three planes and has. Most mobile and least stable joint. Shoulder joint motions. Flexion- is raising the arm in the lateral plane from 0-180 degrees. Extension- return to anatomical position.
External Rotation- occurs in the transverse plane, 90 degrees out from neutral.Shoulder joint motions
Glenoid labrum-fibrocartilage ring attached to the rim of the glenoid fossa, which deepens the cavity.
Greater Tubercle/Tuberosity- large projection lateral to the head. Supraspinatus, infraspinatus and teres minor attach here.
Lesser Tubercle/Tuberosity- smaller projection on the anterior surface, subscapularis attaches here.
Deltoid tuberosity- lateral side, near the midpoint, deltoid attaches here.
Bicipital Groove- groove between the tubercles containing the long head of the biceps tendon.
joint capsule, tendons of rotator cuff, and bursa.
more of a traumatic injury,
fall on outstretched arm,
arm yanked back.
chronic injury that ultimately tears a tendon.