23.37 Muscles

• Deltoid is the most powerful… can generate 6 times the weight of the upper limb

• Infraspinatus and teres minor can generate 5 times the weight of the upper limb

• Total glenoid resultant forces depends on the position of the arm

  • Deltoid has larger force because it has a larger shear component

• Supraspinatus adds a compressive vector which keeps the resultant towards the glenoid

Kempf 1999[@Kempf1999]

Kempf 1999[@Kempf1999]

Kempf 1999[@Kempf1999]

Kempf 1999[@Kempf1999]

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