About the testExternall Rotation Range of Motion
About the testExternal Rotation Range of Motion
at external rotation ROM:
Symmetry compares your throwing arm external rotation range against your non-throwing shoulder. Most players have more external rotation range in their throwing arm than their non-throwing arm.
Trend looks at how your range changes when compared to previous tests. Players range will fluctuate throughout the season, but if there is a loss of 10% or more, the app will optimize the arm care to a more recovery based program that focuses on mobility.
Pitchers with an external rotation deficit of more than 5 degrees on their throwing arm compared to the non-throwing arm were 2.2x more likely to be placed on the disabled list for a shoulder injury and were 4x more likely to require shoulder surgery (Wilk, 2015).
The risk of elbow injury increased by 7% for each degree of external rotation deficit in the throwing arm (Camp, 2017).
Wilk KE, Macrina LC, Fleisig GS, et al. Deficits in Glenohumeral Passive Range of Motion Increase Risk of Shoulder Injury in Professional Baseball Pitchers: A Prospective Study. Am J Sports Med. 2015;43(10):2379–2385.