page_title: Shoulder joint
section_title: Spaces
hierarchical_section_title: Shoulder joint / Structure / Spaces
caption_attribution_description: English: Supraspinatus outlet view X-ray, showing subacromial space.
context_page_description: The shoulder joint is structurally classified as a synovial ball and socket joint and functionally as a diarthrosis and multiaxial joint. It involves articulation between the glenoid cavity of the scapula and the head of the humerus.
  Due to the very loose joint capsule that gives a limited interface of the humerus and scapula, it is the most mobile joint of the human body.
context_section_description: Significant joint spaces are:
  The normal glenohumeral space is 4–5 mm.
  The normal subacromial space in shoulder radiographs is 9–10 mm; this space is significantly greater in men, with a slight reduction with age. In middle age, a subacromial space less than 6 mm is pathological, and may indicate a rupture of the tendon of the supraspinatus muscle.
  The axillary space is an anatomic space between the associated muscles of the shoulder. This space transmits the subscapular artery and axillary nerve.
caption: Supraspinatus outlet view X-ray, showing subacromial space measurement.
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