【論文摘要】The Humeral Retroversion in Collegiate Students and Its Relationship with Glenohumeral Internal Rotation Deficit: A Pilot Study

【論文摘要】肱骨後傾對於盂肱關節內旋活動度缺損之影響：前導研究

林昱均(Yu-Chun Lin) ； 林燕慧(Yang-Hua Lin) ； 陳柏村(Po-Tsun Chen)

《物理治療》 47卷4期 (2022/12) Pp. 286-287

https://doi.org/10.6215/FJPT.202212.O11

摘要

Background and Purpose: Glenohumeral internal rotation deficit (GIRD) is known as a risk factor of shoulder injuries, caused by the tightness of capsule and muscle on posterior shoulder and the increased humeral retroversion (HR). However, the evaluation may put more attention on the soft tissue than on the bony changes of humerus. This study aimed to compare the HR between bilateral shoulders and to examine the relationship between HR and the deficit of internal rotation (IR) in participants with GIRD. Methods: Nine collegiate students (5 males and 4 females, mean age 23.0 ± 1.2 years) with GIRD (the difference was of internal rotation between bilateral shoulders was more than 20°) were recruited. After the horizontal alignment of humeral head was monitored by sonography, the HR was measured as the glenohumeral IR in supine with 90° of shoulder abduction and 90° of elbow flexion. The Wilcoxon sign rank tests was used to compare the HR between two shoulders. The Spearman's correlation was used to examine the relationship between IR deficit and HR. Results: The IR deficit was occurred on the dominant shoulder in all participants (range of IR, dominant side: 50.0° ± 9.7°, non-dominant side: 74.4° ± 10.1°). The HR on the dominant shoulder (66.0° ± 8.7°) was significantly larger than that on the non-dominant side (58.0° ± 8.1°). A significant correlation was found between the IR deficit and the HR (ρ = 0.65, p ＜ 0.01). Conclusions: The degree of deficit in IR correlates with the HR in participants with GIRD. The HR should be considered before improving the range of internal rotation. Clinical Relevance: Both the soft-tissue tightness and HR should be evaluated to realize the respective contributions to IR deficit.