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Youth Throwers Respond to Stretching (Safethrow)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified February 2010 by Metzger, Charles, M.D..
Recruitment status was:  Active, not recruiting
ClinicalTrials.gov Identifier:
First Posted: February 9, 2010
Last Update Posted: February 9, 2010
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
Metzger, Charles, M.D.
The purpose of this study is to document the rates of youth baseball player demographics, incidence of arm pain, usage of different pitch types, and degree of internal rotation contracture in the throwing versus the non-throwing shoulder. We followed a subgroup of players for a year to see if a particular stretch would help reduce the internal rotation contracture.

Shoulder Posterior Capsular Contracture

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Shoulder Posterior Capsular Contracture in Youth Baseball Players: It Can be Improved by Stretching

Further study details as provided by Metzger, Charles, M.D.:

Primary Outcome Measures:
  • Degree of decrease in internal rotation contracture of the shoulder [ Time Frame: One year ]

Enrollment: 1261
Study Start Date: January 2008
Estimated Study Completion Date: December 2010
Estimated Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)
Detailed Description:

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.


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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
Study Population
1261 male baseball players ages 8 to 15

Inclusion Criteria:

  • male
  • baseball player
  • ages 8 to 15

Exclusion Criteria:

  • female (suspected hormonal/gender influences on capsular elasticity)
  • prior throwing arm surgery
  Contacts and Locations
Information from the National Library of Medicine

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

United States, Texas
Greater Houston Orthopedic Specialists
Bellaire, Texas, United States, 77401
Sponsors and Collaborators
Metzger, Charles, M.D.
Principal Investigator: Charles L Metzger, MD Memorial Hermann Health System
  More Information

Additional Information:

Responsible Party: Charles Metzger, M.D., The University of Texas Health Science Center at Houston
ClinicalTrials.gov Identifier: NCT01065181     History of Changes
Other Study ID Numbers: Safethrow01
First Submitted: February 6, 2010
First Posted: February 9, 2010
Last Update Posted: February 9, 2010
Last Verified: February 2010

Keywords provided by Metzger, Charles, M.D.:
posterior inferior glenohumeral ligament
posterior capsule
capsular contracture
throwing injury

Additional relevant MeSH terms:
Joint Diseases
Musculoskeletal Diseases
Muscular Diseases