Lesson 7 Tight Hip Internal Rotation

Normal hip internal rotation is between 35-45 degrees. The studies conducted at Human Motion Associates has revealed those players with UCL or elbow injuries average less than 30 degrees of internal hip rotation of the opposing hip to the throwing arm. This results in posterior shoulder strain and the humerus (upper arm) rotates inward further and faster than the forearm resulting in a significant secondary stress load to the elbow and UCL. When this condition is combined with Over Striding, the pitcher is at a significantly increased risk of elbow problems.

Locometrics