A 28-year-old female presents to clinic with complaints of bilateral hip pain. She states that she recently had gave birth to her second child 2 weeks ago. She opted to give birth via spontaneous vaginal delivery. However, since the event, she has had pain in her hips when she walks. Osteopathic structural examination reveals a positive seated flexion test on the left. Palpation of the sacrum reveals a deeper left ILA and sacral sulcus. Given the exam findings, which of the following is the most likely diagnosis of the patient’s sacral somatic dysfunction?