A 70-year-old female with past medical history of dementia presents to clinic with her daughter after recent fall. The daughter explains that ever since her mother’s most recent fall, she has been walking with a limp. Physical examination is significant for an antalgic gait. Xray images taken in the office demonstrate intact osseous structures of the pelvis and lower extremities. Osteopathic structural examination reveals the left transverse process of L5 to be deeper than that of the right. The rotational asymmetry appears to become more symmetric as the patient bends forward. Given the exam findings above, which of the following is a possible somatic dysfunction exhibited by the sacrum?