Garvey et al- Sportsman hernia: what can we do? Hernia. Jan. 12, 2010
The author's state risk factors as reduced hip range of motion and poor muscle balance around the pelvis, limb length discrepancy and pelvic instability.
I think this is all stuff we as A.T.s can be proactive on. Leg length discrepancies can easily be treated with some 1/8, 1/4" felt in the (full length of the) shoe of the shorter leg. Make sure the athlete can functionally 3D load the hips & abs. You would be surprised, for example, how many athletes cannot perform a decent posterior lunge. Traditionally, pelvic stabilization programs are performed in bridging variations. The problem with this approach is you're using the pelvis as a driver, really not getting the athlete into the proper transformational zones. The ab/groin region must be loaded bottom up/top down to be effective.
I'm really surprised the authors never mentioned femoral torsions as an etiology. I think I'll contact them and see what they think.