Trigger points are typically identified in a patient complaining of acute or chronic onset neck and shoulder pain.
Trigger points are typically identified in a patient complaining of acute or chronic onset neck and shoulder pain. A myofascial trigger point can be diagnosed on palpation of a muscle and is identified by an area of focal hypertonicity. Patients will typically complain of pain when the myofascial point is palpated within a taut muscle band.
In the periscapular region, the muscles typically involved are the trapezius, erector spinae, rhomboids, and levator scapulae. Anatomy of periscapular region The pathophysiology of trigger points is not completely known. The primary hypothesis is overactivity at the postsynaptic junction of the motor end plate that leads to increases in acetylcholine and calcium release, which can lead to persistent muscle contraction.
Ultrasound guided injections into the trigger points have been found to decrease short term pain scores and help decrease use of oral analgesics. Ultrasound image of trigger point injection On ultrasound evaluation, a trigger point will appear as a focal hypoechoic or hyperechoic region within a muscle. Measuring of an increased shear wave speed can also localize trigger points.
If the trigger point is found within the trapezius, then providers should use an in-plane approach to avoid the cervical artery and spine accessory nerve. On ultrasound evaluation, providers should identify the mixed echogenicity of the subcutaneous adipose tissue and then the hyperechoic marbled muscle tissue. When evaluating the trapezius muscle, the probe should be placed in medial to lateral direction and the border on the scapula is seen on the lateral edge of the image.
Then, the most superficial structure is the trapezius muscle. Deep to the trapezius is the levator scapula or rhomboid minor. The spinal accessory nerve lies between the trapezius and rhomboid minor.
If you are experiencing symptoms that may be related to ultrasound guided periscapular trigger point injection, it is important to see a sports medicine physician. Early evaluation and treatment typically lead to better outcomes. Do not ignore pain or symptoms that are limiting your activity.
*This article is for educational purposes only and does not substitute for professional medical advice. Always consult a qualified healthcare provider.*
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