A 65-year-old female presents to clinic with complaints of low back pain ongoing for 1 week. She states the pain began after picking up her grandchildren. She says the pain does not radiate and rates the pain a 4/10. Osteopathic structural examination is significant for tightness and tenderness to palpation of the paraspinal musculature around L2. Palpation of the transverse processes of L2 reveals that the left transverse process is more anterior than the right. The asymmetry seems to become more exaggerated when asking the patient to lean forward. Which of the following diagnoses is most likely given the physical exam findings?