Shoulder Physiological Offset Parameters in Asian Populations-A Magnetic Resonance Imaging Study

Area of Science:

• Orthopedics and Sports Medicine
• Radiology and Medical Imaging
• Anatomy and Biomechanics

Background:

• Shoulder offset parameters (SOPs) are vital for diagnosing and treating shoulder conditions.
• Limited research exists on SOPs in healthy Asian shoulders using MRI.
• Establishing population-specific reference values is essential for clinical application.

Purpose of the Study:

• To determine physiological reference values for key shoulder offset parameters in an Asian population.
• To investigate the influence of age, gender, side, and osteoarthritis on these parameters.

Main Methods:

• Retrospective analysis of 500 shoulder MRI scans from adult patients.
• Measurement of humeral offset (HO), glenoidal offset (GO), lateral glenoidal humeral offset (LGHO), humeral shaft axis offset (HAO), and cortical offset (CO).
• Statistical examination of correlations between SOPs and demographic/clinical factors.

Main Results:

• Established mean values for HO (22.9 mm), GO (62.3 mm), LGHO (48.9 mm), HAO (25.2 mm), and CO (15.7 mm).
• Males showed significantly higher SOP values than females; age correlated negatively with all SOPs.
• No significant differences in SOPs were found between osteoarthritic and non-osteoarthritic shoulders.

Conclusions:

• Significant gender and age-specific variations exist for all measured SOPs in the Asian population.
• The contralateral shoulder can serve as a reliable reference for surgical planning, with minor exceptions.
• These reference values are critical for informed shoulder surgery planning and interpretation of imaging findings.