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Differences in Scapular Upward Rotation Between Baseball Pitchers and Position Players
Ist Teil von
The American journal of sports medicine, 2007-12, Vol.35 (12), p.2091-2095
Ort / Verlag
Los Angeles, CA: American Orthopaedic Society for Sports Medicine
Erscheinungsjahr
2007
Quelle
MEDLINE
Beschreibungen/Notizen
Background: Baseball pitchers have been reported to have an increased prevalence of shoulder injury compared with position players such
as infielders and outfielders. Furthermore, insufficient scapular upward rotation has been empirically linked with several
of these shoulder disorders. However, the difference in scapular upward rotation between pitchers and position players is
not known.
Hypothesis: Pitchers will have decreased scapular upward rotation of their dominant shoulders compared with position players.
Study Design: Descriptive laboratory study.
Methods: Dominant shoulder scapular upward rotation was measured with the arm at rest and at 60°, 90°, and 120° of humeral elevation
among 15 professional baseball pitchers and 15 position players with no recent history of upper extremity injury.
Results: Independent t tests showed pitchers have significantly less scapular upward rotation at 60° (3.9°, P = .011) and 90° (4.4°, P = .009) of humeral elevation compared with position players.
Conclusion: Baseball pitchers have less scapular upward rotation than do position players, specifically at humeral elevation angles of
60° and 90°.
Clinical Relevance: This decrease in scapular upward rotation may compromise the integrity of the glenohumeral joint and place pitchers at an
increased risk of developing shoulder injuries compared with position players. As such, pitchers may benefit from periscapular
stretching and strengthening exercises to assist with increasing scapular upward rotation.
Keywords:
scapula
kinematics
throwing athletes
digital inclinometer