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- Title
Shoulder laxity and rotator cuff muscle strength in healthy overhead athletes: an ultrasound study.
- Authors
Takeru Abekura; Noriaki Maeda; Ryosuke Kaizuka; Makoto Komiya; Tsubasa Tashiro; Satoshi Arima; Yukio Urabe
- Abstract
Introduction: Shoulder instability may exist in healty overhead (OH) athletes, as high ligament and bursa flexibility contributes to performance exertion in OH athletes. Previous study reported that methods for measuring shoulder laxity using ultrasonography was reliable.2 However, no studies have examined differences in shoulder laxity between non-OH and OH athletes using ultrasound imaging devices. Objectives: To compare shoulder laxity and rotator cuff muscle strength between OH and non-OH athletes and to examine the characteristics of shoulder joint stability in OH athletes. Study design: Cross-sectional study Methods: The dominant shoulder of 7 healthy men who play OH sports (OH group) and 7 healthy men who did not play OH sports (non-OH group) were included. Shoulder laxity were measured according to the method of Sangeeta et al2). The shoulder joint was fixed in 90-degree abduction and external rotation in the sitting position, the posterior labrum and posterior humeral border were delineated by an ultrasonography (KONICA MINOLTA, Japan). The humeral head was pulled back and forth up to 30 N with a tensiometer (TAKEI, Japan), and the anterior and posterior laxity were measured. Internal and external rotation muscle torque were measured by a dynamometer (ANIMA, Japan). For statistical analysis, group comparisons were performed by unpaired t-test (p<0.05). Results: The OH group had significantly higher anterior laxity (0.9 ± 0.6 mm; 1.9 ± 0.8 mm), internal rotation muscle torque (31.1 ± 7.1 Nm; 42.4 ± 8.9 Nm), and external rotation muscle torque (29.2 ± 6.5 Nm; 35.9 ± 4.3 Nm) than the non- OH group (p<0.05, respectively). Conclusions: The OH group had higher anterior laxity than the non-OH group, suggesting the presence of structural instability of the shoulder joint in healthy OH athletes. Internal and external rotation muscle torques was higher in the OH group and may be antagonistic to increased structural instability.
- Subjects
NORWAY; SHOULDER joint; CONFERENCES &; conventions; ATHLETES; ROTATOR cuff; MUSCLE strength; JOINT instability
- Publication
International Journal of Sports Physical Therapy, 2024, Vol 19, Issue 6, p775
- ISSN
2159-2896
- Publication type
Article