The relationship between anterior glenohumeral laxity and proprioception in collegiate baseball players.
OBJECTIVE
To determine if a relationship exists between anterior glenohumeral (GH) laxity and proprioception.


METHODS
Cross-sectional study.


METHODS
University biomechanics laboratory.


METHODS
Thirty asymptomatic collegiate baseball players.


METHODS
Anterior GH laxity.


METHODS
Proprioception (active joint position sense) at positions of 75 degrees of external rotation, 30 degrees of external rotation, and 30 degrees of internal rotation were measured using an isokinetic dynomometer. Anterior GH laxity was measured using an instrumented arthrometer.


RESULTS
Linear regression analyses showed that there were no relationships between anterior GH laxity and active joint position sense at 30 degrees of GH internal rotation and 30 degrees of GH external rotation (r = 0.21, P = 0.13). However, there was a moderate positive relationship between anterior GH laxity and joint position sense at 75 degrees of shoulder external rotation (r = 0.56, P = 0.001).


CONCLUSIONS
These results suggest that shoulder proprioception in 75 degrees of external rotation decreases as anterior GH laxity increases. These results may prove beneficial in the prevention, evaluation, and treatment of various shoulder injuries associated with GH laxity.
School of Kinesiology and Recreation, Illinois State University, Normal, Illinois 61790, USA. klaudner@ilstu.edu
Kevin G
KG
Laudner
Keith
K
Meister
Satoshi
S
Kajiyama
Bria
B
Noel
D053587:Arthrometry, Articular; D001484:Baseball / Q000502:physiology*; D001696:Biomechanical Phenomena / Q000502:physiology; D003430:Cross-Sectional Studies; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008297:Male; D011434:Proprioception / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology; D012044:Regression Analysis; D012399:Rotation; D012785:Shoulder Joint / Q000502:physiology*; D014495:Universities; D055815:Young Adult