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Comparative Study
. 2010 Jan-Feb;45(1):44-50.
doi: 10.4085/1062-6050-45.1.44.

Internal rotation and scapular position differences: a comparison of collegiate and high school baseball players

Stephen J Thomas  1 , Kathleen A Swanik, Charles B Swanik, John D Kelly
Affiliations
Comparative Study

Internal rotation and scapular position differences: a comparison of collegiate and high school baseball players

Stephen J Thomas et al. J Athl Train. 2010 Jan-Feb.

Abstract

Context: Conditions such as labral and rotator cuff injuries have been linked with decreases in glenohumeral internal-rotation and increases in external-rotation motion. Also, decreased glenohumeral internal rotation is strongly associated with scapular dyskinesis.

Objective: To compare healthy collegiate and high school baseball players' glenohumeral joint range of motion and scapular position.

Design: Cross-sectional study.

Setting: Institutional research laboratory.

Patients or other participants: Thirty-one male National Collegiate Athletic Association Division I collegiate (age = 20.23 +/- 1.17 years, height = 186.24 +/- 5.73 cm, mass = 92.01 +/- 7.68 kg) and 21 male high school baseball players (age = 16.57 +/- 0.76 years, height = 180.58 +/- 6.01 cm, mass = 79.09 +/- 11.51 kg).

Main outcome measure(s): Glenohumeral internal and external rotation and scapular upward rotation were measured with a digital inclinometer. Scapular protraction was measured with a vernier caliper. All variables except scapular upward rotation were calculated as the difference between the dominant and nondominant sides.

Results: Collegiate baseball players had more glenohumeral internal-rotation deficit (4.80 degrees, P = .028) and total motion deficit (5.73 degrees, P = .009) and less glenohumeral external-rotation gain (3.00 degrees, P = .028) than high school players. Collegiate baseball players had less scapular upward rotation than high school players at the 90 degrees (4.12 degrees, P = .015, versus 3.00 degrees, P = .025) and 120 degrees (4.00 degrees, P = .007, versus 3.40 degrees, P = .005) positions. The scapular protraction difference was greater in collegiate baseball players than in high school players in the hands-on-hips and 90 degrees positions (0.77 cm, P = .021, and 1.4 cm, P = .001).

Conclusions: When comparing high school with collegiate baseball players, these data suggest that glenohumeral internal-rotation deficit and scapular position change as the level of competition increases.

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Figures

Figure 1
Figure 1
Measurement of scapular upward rotation using a modified digital inclinometer. Reprinted with kind permission of Springer Science and Business Media from Thomas SJ, Swanik KA, Swanik CB, Kelly JD IV. Internal rotation deficits affect scapular positioning in baseball players [published online ahead of print October 20, 2009]. Clin Orthop Rel Res. doi:10.1007/s11999-009-1124-z.
Figure 2
Figure 2
Measurement of scapular protraction using vernier caliper. Reprinted with kind permission of Springer Science and Business Media from Thomas SJ, Swanik KA, Swanik CB, Kelly JD IV. Internal rotation deficits affect scapular positioning in baseball players [published online ahead of print October 20, 2009]. Clin Orthop Rel Res. doi:10.1007/s11999-009-1124-z.
Figure 3
Figure 3
Glenohumeral internal-rotation deficits in collegiate versus high school baseball players. a Difference between collegiate and high school players was significant (P < .05).
Figure 4
Figure 4
Glenohumeral external-rotation gains in collegiate versus high school baseball players. a Difference between collegiate and high school players was significant (P < .05).
Figure 5
Figure 5
Total motion deficits in collegiate versus high school baseball players. a Difference between collegiate and high school players was significant (P < .05).
See this image and copyright information in PMC

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