Understanding 90 Degrees Shoulder Abduction

Introduction to Shoulder Mechanics

The shoulder joint is an intricate mechanism that allows a broad range of motion. Among its various movements, shoulder abduction is crucial for many daily activities. Specifically, the action of lifting the arm to 90 degrees shoulder abduction represents a key functional position required in numerous health and medical fields, especially in physical therapy and chiropractic practices.

The Anatomy of the Shoulder Joint

The shoulder comprises several components that facilitate its mobility:

  • Joint Structure: The glenohumeral joint is where the humerus (the upper arm bone) meets the scapula (shoulder blade).
  • Muscle Groups:

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