Deltoid syndrome is a condition in which the deltoid muscle causes pain. The deltoid muscle is the muscle that wraps the shoulder and gives it a rounded appearance. It has anterior, lateral and posterior fibers. The collarbone starts from the acromion and spina scapula of the scapula, the arm bone attaches to the deltoid tuberosita on the outer side of the humerus. It mainly provides to open the arm to the side (abduction movement). When the anterior fibers contract, it makes the arm forward and rotated, and when the posterior fibers contract, it makes the arm move backwards and outwards. It is one of the structures that prevents the shoulder from coming off while carrying heavy loads. In addition, since it allows to open the arm to the side, it prevents the carried items from hitting the hips by keeping them away from the body.

Among the medical problems that the deltoid muscle is affected, we can count muscle tears, muscle wasting, enthesopathy, fibrosis and myofascial pain.

The deltoid muscle is predisposed to develop myofascial pain syndrome . This is also called deltoid syndrome. Strain injuries during sports or when the arm is extended back and forth or to the side due to a fall can injure the deltoid muscle. In occupations that require lifting and carrying things for a long time, microtraumas can accumulate over time and lead to the formation of trigger points and myofascial pain syndrome in the muscle. Another risk factor is posture disorder. Factors such as chronic stress, depression, malnutrition also play a role.

Deltoid syndrome is a chronic pain syndrome that affects a certain part of the body. In myofascial pain syndrome, when the muscle is examined by touch, trigger points that produce pain are detected. It is also called kulunç among the people . Trigger points are usually in the area where the pain is felt, but the pain can spread to other parts of the body. Reflected pain may cause confusion in the diagnosis and unnecessary investigations and treatments. In people with myofascial pain syndrome in the deltoid muscle, the pain usually radiates from the shoulder down to the arm. Applying mechanical pressure or stretching on the trigger point produces the reported pain. The sudden contraction of the affected muscle also causes a response called the jump response in the person. Muscle stiffness and loss of strength may also occur.

Signs and Symptoms

The peculiarity of deltoid syndrome is the identification of myofascial trigger points in the muscle. Pain occurs with mechanical stimulation or tension of the trigger point. The pain affects both the local area and can spread to other areas, the upper arm. The jumping sign is characteristic.

Deltoid Syndrome Diagnosis

Diagnosis is made by medical history and physical examination. There is no objective diagnostic test. Specific results could not be obtained with examinations such as muscle biopsy, EMG, and MRI. Other possible diseases should be excluded.

Differential diagnosis

Problems that cause similar complaints such as bursitis , tendinitis , and rotator cuff tear can be distinguished by methods such as MRI and ultrasonography. Multiple sclerosis, connective tissue disease, inflammatory muscle disease, and fibromyalgia should also be considered in the differential diagnosis according to existing additional symptoms .


Local anesthetic injection or dry needling can be done by determining the trigger points . Physical therapy methods such as TENS, heat or cold application, and exercise may be helpful. If there are accompanying problems such as depression and fibromyalgia, appropriate treatments are given.

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