A Myofascial Trigger Point (MTrP) is defined as a hypersensitive spot in a skeletal muscle associated with a taut band which is painful on compression and refers pain in characteristic pattern for each muscle. They can be activated directly by muscle overload, trauma, prolonged muscle contraction and nerve compression. This type of tissue dysfunctions in musculoskeletal system happens due to continuous exposure to abnormal, adverse physical conditions during rest or in job duty leading to pain and injury in body especially in neck and shoulder. 

In accordance to clinical manifestation, MTrPs are classified into Active and Latent Trigger points. Latent Myofascial Trigger Points (LTrPs) are those in which local and referred pain do not produce any familiar or usual symptoms for the individual. 

Upper Trapezius is a posture muscle and has a high susceptibility for overuse. Different studies already established the presence of latent trigger points in Upper Trapezius of symptomatic participants with shoulder pain, subacromial impingement, mechanical neck pain and chronic headaches

Instrument Assisted Soft Tissue Mobilization (IASTM) is a practical technique using specially designed instrument which is beveled in edges which minimizes the force applied by therapist but maximizes the force delivered to tissues. It provides therapist a mechanical advantage to treat with deeper force transmission and to detect altered tissue properties.

Different studies were conducted to find different manual technique and electrical modalities to treat Latent Trigger Point. But to best of our knowledge, there are no studies are available which was conducted to find the efficacy of IASTM in Latent Trigger Points. 

Hence this study is designed to find out the efficacy of IASTM on Pain Pressure Threshold, Range of Motion and Function in Latent Trigger Points of Upper Trapezius muscle.