Glenohumeral abduction

• Glenohumeral abduction:

  ROM:

  • Approx. 180 °(60 ° of this made possible by lateral rotation of scapula)

  
• Glenohumeral abduction:

  Limited by:

  • contact between greater tubercle and coracoacromial arch
  • tension in rotator cuff muscles and shoulder adductors

  
• Glenohumeral abduction:

  • Last 60 ° of abduction is accompanied by glenohumeral lateral rotation to reduce contact between greater tubercle and coracoacromial arch