Radiographic joint space in normal acromioclavicular joints.

Area of Science:

• Orthopedics
• Radiology
• Anatomy

Background:

• The acromioclavicular (AC) joint is crucial for shoulder function.
• Variations in AC joint space can indicate pathology.
• Establishing normative data is essential for accurate diagnosis.

Purpose of the Study:

• To measure the acromioclavicular joint space in a healthy population.
• To identify age- and sex-related differences in AC joint space.
• To define criteria for abnormal AC joint space.

Main Methods:

• Standard antero-posterior radiographic images were analyzed.
• Measurements of the AC joint space were taken from 151 normal subjects.
• Statistical analysis was performed to assess differences based on sex and age.

Main Results:

• The AC joint space was significantly wider in men compared to women.
• A highly significant reduction in AC joint space was observed with increasing age in both sexes.
• A joint space of 0.5 mm or less was not considered pathological.
• Joint spaces wider than 7 mm in men and 6 mm in women were deemed abnormal.

Conclusions:

• Age and sex are significant factors influencing AC joint space width.
• The described measurement technique is valuable for population-based research.
• Simple ruler measurements are sufficient for assessing individual cases.