Symptoms of sacroiliac joint dysfunction include: Pain in the lower back, (usually only on one side), hip pain, discomfort with bending over or standing after sitting for long periods, improvement in pain when lying down. (physiologicnyc.com)
[1][8] Patients with sacroiliac joint dysfunction can also develop tightness and dysfunction in the hamstring, quadriceps, iliotibial tract (see «iliotibial band syndrome») and hip flexors, including the psoas muscle. (sijpain.com)
[159] I am prepared to accept some present minor low back injury related to a strain of the left sacroiliac joint causing mild pain at times of prolonged lifting, bending or crouching but I also do not consider that this pain has been disabling to any of the plaintiff's activities at all... (bc-injury-law.com)