"Pelvic Control Of Professional Baseball Pitchers And Its Correlation To Pitching Performance"- McKenzie, ACSM '09 annual meeting.
"Pelvis & Torso Kinematics & Their Relationship to Shoulder Kinematics in High School Baseball Pitchers"- Oliver et al JSCR 12-10.
The first showed pitchers who tilted seven degrees or fewer during their stance transition had lower opponent batting averages (.244 vs. .290) and fewer walks and hits allowed per inning. Interesting, they did not have fewer injuries.
In the 2nd, the authors found a correlation between torso axial rotation speed and shoulder elevation angle (in other words, shoulder drag) in high school baseball pitchers.
Interesting, both recommended "core" training in the same or subsequent articles or lectures.
Couldn't this same concept of pelvic control be applied to other activities like running & jumping; or low back pain? The question is, is core training and pelvis stability exercise the answer. Or, is the unstable pelvis a manifestation of a generalized lack of strength & power in body? What would their PCA look like?