PMID: 16619095Apr 19, 2006Paper

Glenohumeral joint laxity and stiffness in the functional throwing position of high school baseball pitchers.

Journal of Athletic Training
Scott D Crawford, Eric L Sauers

Abstract

Repetitive overhead throwing has been theorized to result in chronic adaptations to the capsuloligamentous restraints of the glenohumeral joint. To compare glenohumeral joint laxity and stiffness between the throwing and nonthrowing shoulders of high school baseball pitchers. Repeated measures. High school athletic training facilities. Twenty-two asymptomatic high school baseball pitchers (age = 16.50 +/- 0.74 years, height = 178.51 +/- 7.66 cm, mass = 75.43 +/- 13.24 kg) from a sample of convenience. We used computerized stress arthrometry to measure glenohumeral joint laxity and stiffness. Anterior glenohumeral joint laxity and stiffness measures were obtained with the shoulder in 90 degrees of abduction and both neutral rotation and 90 degrees of external rotation. Posterior laxity and stiffness measures were obtained with the shoulder in 90 degrees of abduction and neutral rotation. No clinically significant differences were found for glenohumeral laxity or stiffness between sides. However, a statistically significant main effect for position was present for both laxity and stiffness. Anterior glenohumeral joint laxity in the 90 degrees external rotation position was significantly decreased and stiffness was increased in th...Continue Reading

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