9 Questions
What is the ratio of glenohumeral abduction to scapulothoracic upward rotation in scapulohumeral rhythm?
2:1
What is the result of a simultaneous 120 degrees of GH joint abduction and 60 degrees of scapulothoracic upward rotation?
180 degrees of abduction
What is the range of published scapulohumeral rhythms across studies?
1.25 : 1 to 2.9 : 1
What factors can affect scapulohumeral rhythm?
Measurement technique and external loading
What is the significance of Inman's classic 2:1 ratio?
It is a valuable axiom for evaluating shoulder abduction
What is the importance of scapulohumeral rhythm for shoulder function?
All of the above
What is scapulohumeral rhythm?
A natural kinematic relationship between glenohumeral abduction and scapulothoracic upward rotation in the healthy shoulder
What is the full arc of abduction in scapulohumeral rhythm?
Nearly 180 degrees
Which of the following factors can affect the reported scapulohumeral rhythms?
All of the above
Study Notes
- Scapulohumeral rhythm is a natural kinematic relationship between glenohumeral abduction and scapulothoracic upward rotation in the healthy shoulder.
- It occurs at a ratio of 2:1, meaning for every 3 degrees of shoulder abduction, 2 degrees occurs by GH joint abduction and 1 degree occurs by scapulothoracic joint upward rotation.
- A full arc of nearly 180 degrees of abduction is the result of a simultaneous 120 degrees of GH joint abduction and 60 degrees of scapulothoracic upward rotation.
- Published scapulohumeral rhythms vary across studies, most ranging from 1.25 : 1 to 2.9 : 1.
- Variations in the reported scapulohumeral rhythms reflect differences in measurement technique, subjects, speed and plane of motion, and external loading.
- Inman's classic 2:1 ratio remains a valuable axiom for evaluating shoulder abduction.
- Scapulohumeral rhythm is important for shoulder function and can be affected by various factors such as injury or pathology.
- Understanding scapulohumeral rhythm is important in the assessment and treatment of shoulder conditions.
- Scapulohumeral rhythm helps to conceptualize the overall relationship between humeral and scapular movement.
- Scapulohumeral rhythm is a key factor in shoulder biomechanics.
Test your knowledge on scapulohumeral rhythm with this informative quiz. Explore the natural kinematic relationship between glenohumeral abduction and scapulothoracic upward rotation in the healthy shoulder. Learn about the ratio of shoulder abduction, how it varies across studies, and the factors that affect it. This quiz will help you understand the importance of scapulohumeral rhythm in shoulder function, assessment, and treatment. Get ready to dive into the world of shoulder biomechan
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