The subacromial space in normal shoulder radiographs.

Area of Science:

• Orthopedic surgery
• Radiology
• Anatomy

Background:

• The subacromial space is a critical anatomical region in the shoulder.
• Understanding normal subacromial space dimensions is essential for diagnosing shoulder pathology.

Purpose of the Study:

• To establish normative values for the subacromial space in a healthy adult population.
• To investigate the influence of sex and age on subacromial space dimensions.
• To identify potential radiographic indicators of shoulder pathology, such as supraspinatus tendon rupture.

Main Methods:

• Radiographic analysis of 175 normal shoulders using standard anteroposterior views.
• Measurement of the subacromial space.
• Statistical analysis to assess the impact of sex and age.

Main Results:

• The mean subacromial space measured between 9 and 10 mm.
• A statistically significant difference was observed between sexes, with men exhibiting a larger space.
• A slight reduction in space was noted with increasing age.
• A subacromial space less than 6 mm in middle-aged individuals was identified as potentially pathological.

Conclusions:

• Normative subacromial space dimensions are established for anteroposterior radiographs.
• Sex and age are significant factors influencing subacromial space size.
• A subacromial space below 6 mm in middle age is a critical finding, potentially indicative of supraspinatus tendon tears.