Back to Search
Start Over
Lower shoulder abduction during throwing motion may cause forceful internal impingement and decreased anterior stability
- Source :
- Journal of shoulder and elbow surgery. 27(6)
- Publication Year :
- 2017
-
Abstract
- Internal impingement and decreased anterior stability, which result from shoulder capsular loosening, are common shoulder pathologies in throwing athletes. The purpose of this study was to assess the effect of shoulder abduction angle on shoulder internal impingement and anterior shoulder stability during the simulated throwing motion.Eight cadaveric shoulders were tested by simulating the late-cocking and acceleration phases of the throwing motion for intact and thrower's shoulder conditions. The maximal glenohumeral external rotation, anterior translation, location of the rotator cuff insertion with respect to the glenoid, length and site of internal impingement, and glenohumeral contact pressure were measured. All data were compared between shoulder abduction angles of 80°, 90°, and 100°.Decreasing shoulder abduction in the simulated late-cocking phase shifted the humeral head posteriorly (P .03) and superiorly (P .001), decreasing the total internal impingement area between the greater tuberosity and glenoid (P = .04) and increasing the glenohumeral contact pressure during internal impingement (P = .02). In the simulated acceleration phase, anterior glenohumeral translation significantly increased as the shoulder abduction angle decreased (P .001).Decreasing shoulder abduction significantly increased the contact pressure during internal impingement in the simulated late-cocking phase of the throwing motion. During the simulated acceleration phase of the throwing motion, anterior glenohumeral translation significantly increased as shoulder abduction decreased.
- Subjects :
- musculoskeletal diseases
Adult
Joint Instability
Male
Shoulders
education
Motor Activity
03 medical and health sciences
Rotator Cuff
0302 clinical medicine
Phase shifted
Cadaver
Medicine
Humans
Orthopedics and Sports Medicine
Rotator cuff
Range of Motion, Articular
Aged
Orthodontics
030222 orthopedics
business.industry
Shoulder Joint
030229 sport sciences
General Medicine
Anterior shoulder
Humerus
Middle Aged
Biomechanical Phenomena
body regions
Scapula
medicine.anatomical_structure
Shoulder Impingement Syndrome
Shoulder abduction
Surgery
Female
business
Cadaveric spasm
human activities
Throwing
Contact pressure
Subjects
Details
- ISSN :
- 15326500
- Volume :
- 27
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Journal of shoulder and elbow surgery
- Accession number :
- edsair.doi.dedup.....8937ae64d1e127b17cfa5e313937f525