A 42-year-old male patient presents to your clinic with a 4-week history of low back pain and left hip discomfort. The patient reports that the pain started after playing basketball and has not improved with rest or over-the-counter pain medications. Physical examination reveals tenderness over the left sacroiliac joint, a left anterior superior iliac spine (ASIS) more inferior than the right, a left posterior superior iliac spine (PSIS) more superior than the right, and a positive left standing flexion test. Based on these findings, you diagnose the patient with a specific innominate somatic dysfunction. You decide to use the muscle energy technique for treatment. Given the physical examination findings, which innominate somatic dysfunction diagnosis is most likely, and which patient position is most appropriate for the muscle energy treatment?