A 71-year-old female presents to clinic with complaints of right sided hip pain for 2 weeks. She denies trauma and says the pain began after playing with her grandchildren. She has tried over-the-counter medications without relief of her symptoms. Osteopathic structural examination reveals a positive seated flexion test on the right. Palpation of the sacral sulci is more anterior on the right than the left and the right ILA is more posterior than the left. Which of the following diagnoses correctly describes the patient’s sacral somatic dysfunction?