* The study will be randomized clinical trial. This study will be conducted in University of Lahore Teaching Hospital, Lahore, Pakistan. A sample size of 84 will be randomly allocated into two experimental groups, (42 participants in each group), by lottery method. The participants, randomly allocated to the experimental group A, will receive Muscle Energy Technique (METs), Post isometric relaxation technique specifically, in addition with routine physical therapy as TENS, Hot pack, and strengthening exercises. METs will be performed on piriformis, iliopsoas, erector spine muscles, 1 set of 5 repetitions and 10 seconds hold. * Participants in experimental group B, will get Sacroiliac joint manipulations with routine physical therapy by principal investigator. * Both experimental groups will receive twelve treatment sessions and those will be given over a period of six weeks (2 sessions per week, each session of 30-40 minutes). * Assessor will take outcome measures at baseline and at the end of 6th treatment week through Short Form McGill Pain Questionnaire, Roland-Morris Low Back Pain \& Disability Questionnaire and Short Form Survey; SF-20.
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Short Form McGill Pain Questionnaire
Timeframe: 6 weeks
Roland Morris disability and low back pain questionnaire
Timeframe: 6 weeks
Short Form Survey, SF-20
Timeframe: 6 weeks