Original Research Article
Year: 2020 | Month: July-September | Volume: 5 | Issue: 3 | Pages: 136-142
Relationship between Passive Glenohumeral Rotation and Strength of Internal and External Rotator Muscles in Young Healthy Adults
Abhijeet Arun Deshmukh1, Radhika Nitin Nivsarkar2, Monika Mahendra Khobragade3, Heena Mohd Afzal Raeen4
1Associate Professor, Department of Neuro-Physiotherapy, VSPM’s College Of Physiotherapy, Digdoh Hills, Hingna, Nagpur, Maharashtra, India.
2,3,4Intern student, VSPM’s College Of Physiotherapy, Digdoh Hills, Hingna, Nagpur, Maharashtra, India.
Corresponding Author: Abhijeet Arun Deshmukh
ABSTRACT
Introduction: Increased range of motion at glenohumeral joint makes it susceptible to injury and instability. It was found that subjects with total glenohumeral rotation>1650 had less isometric external rotation and internal rotation muscle strength than those with glenohumeral rotation was<1650. Beyond normal 1800 of shoulder range of motion indicates joint instability hence aim was to find out the muscle strength difference of internal rotation and external rotation with total arc of glenohumeral rotation.
Material and Methods: 50 young healthy subjects (43 females,7 males) of 18to25 years were included. Initially dominant shoulder internal and external rotation passive range of motion was recorded with help of universal goniometer as well by motion analyzer in supine position. Shoulder rotator muscle strength was measured using hand held dynamometer in supine position in neutral and at end range of rotation motions.
Data analysis and Results: Karl Pearson’s correlation was used to evaluate correlation between strength and shoulder range of rotation for right side. Out of 50,37 females and 6 males showed >1800 whereas 6 females and 1 male showed<1800 of total shoulder internal and external range of motion. It was observed that subjects with<1800 shoulder rotation showed moderate correlation with muscle strength where as those with>1800 shoulder rotation range showed no or weak correlation with rotator muscle strength.
Conclusion: As the total arc of glenohumeral rotation increases beyond normal limits of 0-1800 there is a decreased strength of internal rotator and external rotator muscles as compared to total arc of glenohumeral rotation less than 1800.
Keywords: Range, Goniometer, Glenohumeral Rotation, Strength, Dynamometer, Young Healthy.