Thanks Dsheri2.

They are good points you raise and i agree...and i have seen protective muscle spasm on one arm worse than the other due to labral tears and poor technique (motor control)...more than a handful of times.

I guess my original intention was to agree that Trigger points are just one possible reason of many that might cause this problem.

The way i think is that problems can come from 6 general sources...these can be linked back to various authors but most prominently Diane Lee and LJ Lee's Clinical Puzzle which builds upon the work of others as well as their own.

1. Their Strategies for Functional Tasks - the way you do something
2. The person's psychosocial influences - what meaning do they place on the pain/problem, their representation of their virtual body, their story, their goals etc etc
3. Their articular system components - ligaments, cartilage, bones, capsule etc
4. Their myofascial system - muscles, tendons, fascia etc
5. Their neural system - motor control, nerves, central influences, etc
6. Their visceral system - the effect of the state of their visceral system on their neuromyofascial system, chemical imbalances etc

To me, trigger points fits into either the myofascial system or the neural system depending on the view you take of them...

...i was merely trying to hurriedly point out the other components in a practical way

Thanks!