Youth Throwers Respond to Stretching (Safethrow)
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ClinicalTrials.gov Identifier: NCT01065181 |
Recruitment Status : Unknown
Verified March 2018 by Charles Metzger, M.D., Metzger, Charles, M.D..
Recruitment status was: Active, not recruiting
First Posted : February 9, 2010
Last Update Posted : March 27, 2018
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Condition or disease |
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Shoulder Posterior Capsular Contracture |
Introduction: Overhead throwing can cause contracture of the shoulder posterior-inferior glenohumeral ligament which can lead to injuries such as superior labral tears. We show that instruction on stretching can favorably alter progression of posterior contractures.
Methods: 1261 male baseball players ages 7-15 completed a questionnaire and shoulder examinations. Measurements of rotation of both shoulders were made with the subjects in the supine position with the scapula stabilized. Glenohumeral internal rotation deficit (GIRD) was calculated. Pitch type and player position, among other variables, were recorded. The prospective cohort was 175 players who were examined twice a year apart. Players with excessive GIRD (exGIRD) were given stretching instruction, and the control group was those without exGIRD who were not given instruction. Change in GIRD as a result of this intervention was documented.
Study Type : | Observational |
Actual Enrollment : | 1261 participants |
Observational Model: | Cohort |
Time Perspective: | Cross-Sectional |
Official Title: | Shoulder Posterior Capsular Contracture in Youth Baseball Players: It Can be Improved by Stretching |
Actual Study Start Date : | January 2008 |
Estimated Primary Completion Date : | September 2019 |
Estimated Study Completion Date : | September 2019 |
- Degree of decrease in internal rotation contracture of the shoulder [ Time Frame: One year ]GIRD is the Glenohumeral Internal Rotation Deficit. It is the difference in the internal rotation of the throwing shoulder compared to the non-throwing shoulder

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Ages Eligible for Study: | 8 Years to 15 Years (Child) |
Sexes Eligible for Study: | Male |
Accepts Healthy Volunteers: | Yes |
Sampling Method: | Non-Probability Sample |
Inclusion Criteria:
- male
- baseball player
- ages 8 to 15
Exclusion Criteria:
- female (suspected hormonal/gender influences on capsular elasticity)
- prior throwing arm surgery

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01065181
Principal Investigator: | Charles L Metzger, MD | Memorial Hermann Health System |
Other Publications:
Responsible Party: | Charles Metzger, M.D., Associate Program Director, Metzger, Charles, M.D. |
ClinicalTrials.gov Identifier: | NCT01065181 |
Other Study ID Numbers: |
Safethrow01 |
First Posted: | February 9, 2010 Key Record Dates |
Last Update Posted: | March 27, 2018 |
Last Verified: | March 2018 |
shoulder posterior inferior glenohumeral ligament posterior capsule |
capsular contracture baseball throwing injury |
Contracture Joint Diseases Musculoskeletal Diseases Muscular Diseases |