Strength might be the root issue. 

 

Goblet Squats- with pain free range of motion 8-12 reps

Suitcase carries- 30-60 seconds of time under tension

Modified Dead Buds 8-12 each leg – with KB and arms are static 

RDL’s – 8-12 reps – start with light to moderate weight

Kneeling Windmill – 6-8 reps each side