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Dynamic stability of glenohumeral joint during scapular plane elevation
Chinese Medical Journal
|June 22, 1999
Summary
Active muscle coordination enhances glenohumeral joint dynamic stability during shoulder elevation. This study used X-ray fluoroscopy to compare active and passive movements, revealing improved joint alignment with muscle engagement.
Area of Science:
- Biomechanics
- Orthopedics
- Human Movement Science
Background:
- The glenohumeral joint's stability is crucial for shoulder function.
- Dynamic stability relies on the coordinated action of surrounding muscles.
- Understanding muscle control during elevation is key to preventing injuries.
Purpose of the Study:
- To investigate muscle-controlled dynamic stability of the glenohumeral joint.
- To compare joint stability during active versus passive shoulder elevation in the scapular plane using X-ray fluoroscopy.
Main Methods:
- Sixty healthy volunteers (23 male, 37 female, mean age 28.4) participated.
- X-ray fluoroscopy captured shoulder elevation (0-150 degrees) in active and passive states.
- Glenohumeral angle (GHA) and scapulohumeral angle were measured at 30-degree intervals.
Main Results:
- The humerus pivot was closer to the glenoid surface during active elevation compared to passive.
- Significant differences in GHA were observed between active and passive motion across all measured angles.
- Manual examination indicated a larger scapulohumeral angle during active motion.
Conclusions:
- Active muscle coordination around the shoulder significantly contributes to glenohumeral joint dynamic stability.
- This muscle control optimizes joint alignment and potentially reduces injury risk during elevation activities.