Inclusion Criteria:

* English speaking pregnant women presenting in their second or third trimester with acute posterior PGP (occurring within the last 3 months). Trimester will be determined from the date of last menses or ultrasound date.
* Current VAS pain score between 2-4
* Written informed consent

Exclusion Criteria:

* Non-English speaking pregnant women \<18 or \>50 years old
* Women presenting with low back pain, or posterior pelvic pain in the first trimester (\<13 weeks gestation).
* Women with acute low back pain in 2nd and 3rd trimester
* Women with anterior pelvic girdle pain (pubic symphysis) alone
* Chronic low back pain (current or past history, defined as \> 6 weeks of low back pain)
* History of lumbar or pelvic fracture; degenerative disc disease; neoplasm; inflammatory disease; active urogenital infection or active gastrointestinal illness; previous surgery of the lumbar spine, pelvic girdle, hip joint or femur
* History or signs of radiculopathy or other systemic neurologic disease
* Narcotic medication use