Sacroiliac Joint Pain and Dysfunction. Source of LBP. SIJ source of LBP 15-38% of cases In a 2010 study the cause of subjects with SIJ was: Idiopathic: 30%, Overload of work injury: 26% Fall: 24%, MVA: 9%, Other incidents: 11%
have a 77% probability for SIJ pain.
+Premotor reaction time for glute max decreased and increased for biceps fem.