Sacroiliac joint dysfunction is the changing of joint structure (ligaments, muscles and cartilage) that cause impairments and movement restrictions. It is one of the primary sources of low back pain among female population and often misdiagnosed. Almost 15-30% patients are suffering from sacroiliac joint dysfunction who presented with the complaint of low back pain. The aim of the study is to determine the effect of mulligan's mobilization with and without clamshell exercise on pain, disability and quality of life in patients with sacroiliac joint dysfunction.

A Randomized controlled trial will be conducted at Fatima Memorial Hospital Physiotherapy Clinic & Boston Physiotherapy and wellness Clinic through consecutive sampling technique on 32 patients which will be allocated through simple random sampling through sealed opaque enveloped into group A & group B. Group A will be treated with only mulligan's mobilization with movement at the frequency of 3 sets with 10 repetitions 3 times/ week without the clamshell exercise. Group B will be treated with mulligan's mobilization with movement and clamshell exercises. Outcome measures will be conducted through pain, disability and quality of life questionnaire after 6 weeks. Data will be analyzed during SPSS software version 21. After assessing normality of data by Shapiro Wilk test, it will be decided either parametric or non-parametric test will be used within a group or between two groups.

Inclusion Criteria:

• Male and female between the ages of 20 to 50 years with positive Leslett's criteria.
• Sacroiliac pain of sub-acute level with the duration of 4 weeks

Exclusion Criteria:

• Spondylosis
• Lumbar canal stenosis
• Spondylolisthesis
• Pervious spinal surgery
• Congenital postural deformities and
• Lumbar disc herniation
• Pelvic bone fractures