Positive when it hurts in flexion, adduction, medial rotation. Trigger point palpable midway between coccyx and trochanter. Correct contributory dysfunctions at hip, SI, lumbar, LE's. Ultrasound, electric stim, strain-counterstrain, muscle energy, myotherapy, stretching. Onset is typically overloading in extremes of position.
Ligament injury is common.
This is painful to passive stretch or traction. Muscle injury is actually rare as these are extremely strong and flexible tissues. Passive stress tests are negative, but resisted active contraction painful. Pain is typically immediate, acute, and localized. Pain can refer distally with severe injury.