Trigger points are commonly referred to as “knots” in a muscle. They are often an overlooked cause of pain even though they are very common in the musculoskeletal system. They are defined as “a hyperirritable spot in a taut band of a skeletal muscle that is painful on compression, stretch, overload or contraction of the tissue which usually responds with a referred pain that is perceived distant from the spot” (Simone et al 1999). Essentially, they are tender areas to touch, and often can be sending pain signals even when they are not touched. Although any muscle in the body can have trigger points, a muscle that is commonly involved is the piriformis. This is a deep hip rotator muscle that is shown in the picture above. Trigger points in this area can cause pain through the whole glut region, making it difficult to sit, walk, or pick up your leg, as in putting on a sock. Because they contribute to decreased muscle flexibility and strength it may be difficult to perform daily activities.
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