Risk Factors for Shoulder and Elbow Injuries in High School Baseball Pitchers
- 3 June 2014
- journal article
- research article
- Published by SAGE Publications in The American Journal of Sports Medicine
- Vol. 42 (8), 1993-1999
- https://doi.org/10.1177/0363546514535070
Abstract
Background: Shoulder strength and motion deficits in high school baseball pitchers have been implicated in injury risk. Purpose/Hypothesis: To prospectively determine if preseason strength and range of motion (ROM) are predictive of injury in high school baseball pitchers. It was hypothesized that ROM asymmetries and weakness would be predictive of injury. Study Design: Case-control study; Level of evidence, 3. Methods: Preseason strength and ROM measurements were made on 101 pitchers from 4 different high schools over 4 seasons (total 166 pitcher-seasons: 25 freshman, 46 junior varsity, and 95 varsity player-seasons). Glenohumeral internal rotation (IR), glenohumeral external rotation, and posterior shoulder ROM were measured bilaterally. Strength in IR, external rotation, supraspinatus (empty-can test), and scapular retraction was measured bilaterally (handheld dynamometer). Injury incidence (injuries per 1000 pitches) was computed for players categorized as above normal (≥1 SD above the mean), normal (within 1 standard deviation of the mean), and below normal (≤1 SD below the mean) for each potential risk factor. Injury was defined as a missed game or practice because of shoulder or elbow problem. Results: There were 28 upper extremity injuries (19 shoulder, 9 elbow; incidence, 0.58 injuries/1000 pitches). There was a trend for supraspinatus weakness to be associated with increased injury risk (relative risk [RR], 3.60; 95% CI, 0.75-17.32; P = .09). When analyzing major injuries only (>3 missed games), preseason supraspinatus weakness was significantly associated with increased injury risk (RR, 4.58; 95% CI, 1.40-15.01; P = .02). Paradoxically, pitchers with no IR loss were at increased risk compared with pitchers with ≥20° loss (RR, 4.85; 95% CI, 1.01-23.29; P = .04). Other ROM and strength measures were unrelated to injury risk. Conclusion: Although excessive loss of IR ROM is thought to be a risk factor for injury, the opposite was the case in this study. The absence of IR ROM loss in high school pitchers may indicate inadequate prior exposure to pitching, resulting in increased injury risk. Preseason supraspinatus weakness was associated with increased risk for a major injury, and preventative supraspinatus strengthening may be beneficial.This publication has 16 references indexed in Scilit:
- Shoulder Range of Motion Measures as Risk Factors for Shoulder and Elbow Injuries in High School Softball and Baseball PlayersThe American Journal of Sports Medicine, 2011
- Reliability of shoulder range of motion comparing a goniometer to a digital levelPhysiotherapy Theory and Practice, 2010
- Preseason Shoulder Strength Measurements in Professional Baseball PitchersThe American Journal of Sports Medicine, 2010
- Shoulder Injuries in US High School Baseball and Softball Athletes, 2005–2008PEDIATRICS, 2010
- Epidemiological Features of High School Baseball Injuries in the United States, 2005–2007PEDIATRICS, 2008
- Changes in Shoulder and Elbow Passive Range of Motion after Pitching in Professional Baseball PlayersThe American Journal of Sports Medicine, 2007
- Glenohumeral Internal Rotation Deficits in Professional Pitchers Enrolled in an Internal Rotation Stretching ProgramThe American Journal of Sports Medicine, 2007
- Glenohumeral Range of Motion Deficits and Posterior Shoulder Tightness in Throwers with Pathologic Internal ImpingementThe American Journal of Sports Medicine, 2006
- Rotational Motion Changes in the Glenohumeral Joint of the Adolescent/Little League Baseball PlayerThe American Journal of Sports Medicine, 2005
- Upper extremity range of motion and isokinetic strength of the internal and external shoulder rotators in major league baseball playersThe American Journal of Sports Medicine, 1988