The purpose of this study is to compare the effect of Local Muscle Vibration versus Muscle energy technique on pain intensity, pain pressure threshold, functional disability, and innominate angle tilt in SIJD.

This study will try to answer the following question:

What is the effect of Local Muscle Vibration compared to Muscle energy technique on pain intensity, pain pressure threshold, functional disability, and innominate angle tilt in SIJD?

Clinicians will attempt to identify the primary factors that contribute to the development of low back pain. These factors are related to specific areas of malfunction that may irritate the tissues and create pain, or cause pain through hypersensitivity of nociceptive pathways in the CNS. Joint dysfunction is one risk factor, which is defined as "loss of joint play movement that cannot be produced by voluntary muscles". Pain in the joint can result from joint dysfunction, in addition to joint dysfunction, muscle dysfunction is evaluated. History, inspection, palpation, and flexibility tests can all be used to determine this.

Muscle energy technique is based on the concepts of Autogenic Inhibition and Reciprocal Inhibition, to lengthen a shortened muscle, mobilize a stiff joint, strengthen a weak muscle, and reduce localized edema and passive congestion. Several studies approved that (MET) affects positively on SIJD cases.

Local Muscle Vibration is used to pain relief, stimulate edema absorption, improve blood flow, alleviate wound healing, and for its anti-inflammatory and ant-adhesion effects. In addition, pain relief effect have also been widely demonstrated. Vibration comprised of low-magnitude high-intensity stimuli which represents a suitable technique to securely transmit appropriate mechanical signals to patients who are unable to exercise to increase musculoskeletal strength. According to a narrative literature review contain about 35 study descuss effects of local vibration therapy on various performance parameters, LMV have apositive effect on muscle activation, strengh, power and joint range of motion.

According to Iodice et al (2011), local administration of high-frequency VT resulted in significant increase in muscle function after several weeks however, some hormonal alterations and moderate performance gains were observed after a single session. This study will try to investigate the effect of Local Muscle Vibration versus Muscle energy technique, which is more effective in reducing low back pain and disability in cases of SIJD. Up to the authors knowledge no previous study discussed the difference between (LMV) and (MET) on SIJD.

Inclusion Criteria:

both male and female participants with ages between 20-40.

• Pain intensity is greater than 3 over the scale of VAS.
• Pain around SIJ (around PSIS and sacral sulcus).
• Participants with at least three positives out of six provocation and motion palpation tests that have been validated (distraction, compression, Gaenslen, posterior friction test, sacral thrust, and FABER tests).

Exclusion Criteria:

• Neurological impairments in the leg
• Sacroiliitis
• Spondylolisthesis
• pre-diagnosed central or peripheral nervous system disease
• The current pregnancy
• rheumatoid arthritis
• Major surgery of lower limbs and spine

Participants will be blinded to the treatment they will receive, and the statistics doctor will be blinded.