Despite the high popularity and novelty of shock wave therapy (SWT), it is surprising that just one study has examined the effect of SWT on patients with SIJD and their functional ability following treatment by using subjective assessment tools like numeric rating scale (NRS) and limited by its small sample size and lack of long-term follow-up. Therefore, the present study is expected to contribute to the body of knowledge by exploring the effect of adding SWT to core stability exercises in the management of postpartum sacroiliac joint pain.

Inclusion Criteria:

• post-partum women diagnosed with SIJP with limitation of its movement referred from the orthopedist.
• Age is between 25-35 years old.
• Their body mass index will be ranged from 25-35 kg/m2.

Exclusion Criteria:

Patients who have one of the following criteria will be excluded from the study:

• Previous spinal surgery.
• Medical diagnosis other than SIJ dysfunction.
• Patients who had any other spine disorders.
• Patients who had leg length discrepancies.
• Patients with congenital postural deformities.
• Patients with spinal cord injury or acute or unstable neurological signs.
• Patients with cauda equina symptoms related to the spine including changes in bowel or bladder control and perineal sensation.
• Patients with lumber intervertebral disc, spondylosis, lumbar canal stenosis and spondylolysthesis.