Working… Menu

Youth Throwers Respond to Stretching (Safethrow)

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. 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
Information provided by (Responsible Party):
Charles Metzger, M.D., Metzger, Charles, M.D.

Brief Summary:
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.

Condition or disease
Shoulder Posterior Capsular Contracture

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.

Layout table for study information
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

Primary Outcome Measures :
  1. 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

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
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

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 identifier (NCT number): NCT01065181

Sponsors and Collaborators
Metzger, Charles, M.D.
Layout table for investigator information
Principal Investigator: Charles L Metzger, MD Memorial Hermann Health System
Publications of Results:

Other Publications:
Layout table for additonal information
Responsible Party: Charles Metzger, M.D., Associate Program Director, Metzger, Charles, M.D. 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
Keywords provided by Charles Metzger, M.D., Metzger, Charles, M.D.:
posterior inferior glenohumeral ligament
posterior capsule
capsular contracture
throwing injury
Additional relevant MeSH terms:
Layout table for MeSH terms
Joint Diseases
Musculoskeletal Diseases
Muscular Diseases