Date of Award
Master of Science (MS)
Athletic Training – Post Professional Concentration
Alison Gardiner-Shires, PhD, ATC
Nicole Cattano, PhD, ATC
Mark Shires, MS, ATC
Context: Shoulder injuries are a significant problem in baseball players. The relationship between shoulder range of motion (ROM) deficit, hip joint flexibility and function of the diaphragm has been investigated as a global contributor to injuries in overhead athletes. Objective: To investigate the effects of pelvic positioning on shoulder total ROM and IR, and contralateral hip internal rotation (IR) of baseball players. Design: Pretest/posttest observational cohort study with repeated measures Setting: NCAA Division II baseball team Patients: Ten male pitchers Intervention: Left hip repositioning technique Main Outcome Measure(s): ROM was assessed using a digital inclinometer for right shoulder IR, right shoulder total ROM, left hip IR, and presence of left anterior inferior chain (AIC) pattern. Results: During the 5-day intervention, 6 pitchers presented without the left AIC pattern, while 4 presented with the left AIC pattern in up to half of the 10 encounters. The results of a one-way ANOVA with repeated measures indicated a significant time effect for both left hip internal rotation and shoulder total motion. A one-way ANOVA with repeated measures indicated no significant time effect for shoulder internal rotation. There were no between group differences in any range of motion when comparing LAIC pattern to a neutral pelvis. Conclusions: Participants experienced changes in ROM as a result of regular throwing per prior research. However, the left AIC pattern did not occur as frequently as hypothesized; therefore, the effects of left pelvic positioning on shoulder and hip ROM are unclear. Word Count: 243
Williams, Kaitlyn, "The Effect of Left Pelvic Positioning on Contralateral Shoulder Total Range of Motion and Internal Rotation Deficit in Collegiate Baseball Pitchers" (2020). West Chester University Master’s Theses. 150.