For many adults, discovering they have developmental dysplasia of the hip (DDH) comes as a quiet but life-altering shock. It usually starts as an occasional ache deep in the groin, a clicking sensation during a normal walk, or a feeling of instability when standing up.

If you have snapping hip syndrome, you already know the sensation better than any textbook description: that click, pop, or thud deep in the front or side of the hip when you swing your leg forward, stand up from a chair, or rotate in bed.