Preliminary note on biometric data relating to the human coraco-acromial arch

Area of Science:

• Orthopedic anatomy
• Biometric analysis
• Human skeletal morphology

Background:

• The coraco-acromial arch is crucial for shoulder joint function.
• Understanding its anatomical variations is important for diagnosing and treating shoulder pathologies.
• Previous studies have not fully detailed the specific bony variations and their classification.

Purpose of the Study:

• To quantitatively assess variations in the coraco-acromial arch dimensions (depth and height).
• To identify key anatomical sites of bony variation within the arch.
• To classify coraco-acromial arch types based on structural composition.

Main Methods:

• Biometric analysis of 20 human scapulae.
• Graphic representation using rectangular coordinates.
• Spatial analysis across three reference planes.

Main Results:

• Significant bony variations were identified, primarily at the coracoid apophysis.
• The study distinguished two main types of coraco-acromial arches.
• Classification was based on the predominant component: either bony or ligamentous.

Conclusions:

• Coraco-acromial arch morphology exhibits notable variations, particularly at the coracoid apophysis.
• A classification system based on bony versus ligamentous predominance can differentiate arch types.
• These findings contribute to a better understanding of shoulder biomechanics and potential pathologies.