A 27-year-old female presents to clinic with complaints of left-sided hip pain. The patient states that the pain started 3 weeks ago after the birth of her daughter. History reveals that the patient had a prolonged spontaneous vaginal delivery complicated by a tear of her perineum. Physical examination reveals a well healing laceration in the perineal area. Osteopathic structural examination reveals a positive standing flexion test on the left. Her left ASIS appears to be more lateral than the right ASIS and the right PSIS appears more lateral than the left PSIS. Given the examination findings above, which of the following is the likely diagnosis?