Lucas Rylander, MD
September 28, 2012
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None
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At the conclusion of this presentation, the
participant should be able to:
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1. Review applied shoulder anatomy
2. Improve understanding of basic shoulder kinesiology
3. Identify the anatomical locations of common shoulder pathology
4. Develop an understanding of how surgeons treat this pathology
5. Utilize this information in clinical practice
Inherently Unstable
Limited Bony Constraint
Like a golf ball on a golf
tee…always just about to
fall off
Relies on the ligaments and
muscles to keep it balanced
Labrum
 Attachment site for
capsuloligamentous
structures
 Important extension of
articular cavity, deepends
the glenoid socket by nearly
50%
Rotator Cuff Muscles
 Supraspinatus – scapular
plane abduction
 Infraspinatus – externally
rotate & extend humerus
 Teres Minor – works with
infraspinatus
 Subscapularis – internally
rotates & fwd flexes the
humerus
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The RTC has 2 main
functions
 First, it helps hold the
ball portion of the
shoulder centered in the
socket
 Second, it helps to move
the shoulder forward, out
to the side, and to rotate
the shoulder in and out
Huge Mechanical Disadvantage