Neck pain is a frequent complaint among the general population and may be attributed to improper posture, inadequate sleep positioning, an acute injury, among other causes. It has been reported that about half of all individuals will suffer from neck pain at some point in their life. While numerous treatment options exist for neck pain, only a handful of patients seek osteopathic manipulative treatment (OMT).

OMT remains one of the staples of the osteopathic medical school curriculum and is widely used among practicing osteopathic physicians today for the treatment of neck pain and other musculoskeletal pain.[1] As one of the more gentle techniques within the scope of OMT, strain-counterstrain (SCS), also known as positional release therapy, is an effective and safe alternative treatment option for patients experiencing cervical pain.[2] Despite little research being conducted on this technique, SCS has been utilized clinically by osteopathic physicians for over a half-century.[3] The technique has shown promise in patients who have failed to achieve relief of symptoms from other treatment methods.[4] Among the approximately 25 OMT techniques that exist, SCS was reported as the fourth most commonly used by a survey of osteopathic providers.[5] Aside from cervical pain, SCS can be used to treat several medical conditions, especially those involving the musculoskeletal system. 

Founded in 1955 by Lawrence H. Jones, D.O., the strain-counterstrain (SCS) model has been primarily utilized by osteopathic physicians as a procedure performed to aid in the diagnosis and indirect treatment of a patient's somatic dysfunction.[5] Diagnosis is achieved through a pain scale and tissue texture abnormalities found at associated myofascial tenderpoints (TPs). Examples of tissue texture abnormalities include asymmetry, restriction, changes in tone, or temperature.[6] As an indirect technique, SCS attempts to move the affected region in the direction opposite of the restrictive barrier. Treatment is performed by positioning the patient to achieve spontaneous tissue release while the physician simultaneously monitors the TP. In essence, the TP should be relieved by placing the patient in a position-of-comfort, holding this position for 90 seconds, and slowly returning the patient to a neutral position. SCS, along with all OMT techniques, aims to reduce pain, enhance function, and improve a patient's quality of life.[6] This review will discuss the use of SCS, particularly involving the cervical vertebrae.

The basic steps required to perform strain-counterstrain (SCS) in any region of the body are as follows:

1. Find a TP.
2. Assess the tenderness using a pain scale.
3. Passively and gently place the patient in a position-of-comfort that results in the greatest reduction of tenderness at the TP. Approximate the position first, then fine-tune through small arcs of movement. Aim to achieve at least 70% tenderness reduction, with the goal of 100%.
4. Maintain the position for 90 seconds while continuing to monitor the patient's TP.
5. Passively return the patient to a neutral position.
6. Re-test for tenderness at the TP.

The cervical spine can be divided into the atlas (C1), the axis (C2), and the typical cervical vertebrae (C2-C7). C1 has no spinous process or vertebral body. C2 has the dens that projects superiorly from its body and articulates with C1. As the union between the head and the atlas, the atlantooccipital (AO) joint's primary motion involves flexion and extension (nodding motion). The atlantoaxial (AA) joint's primary motion involves rotation. The vertebral bodies of the typical cervical segments are separated by intervertebral discs.[7] The upper typical cervicals (approximately C2-C4) have a primary motion of rotation. The lower typical cervicals (approximately C5-C7) have a primary motion of side-bending. The facet joints are synovial joints that display unique orientation along the cervical spine that aid in movement. Studies have determined that particular facet orientation has been correlated with clinical conditions.[8]

The pathophysiology of tenderpoints (TPs) could be explained through the interplay of muscle strain and the resulting perception of pain. A sudden muscle strain—from the overstretching of myofascial tissues—is detected by muscle spindle receptors due to the change in length of the muscle fibers that have been affected. Increased firing of the muscle spindle receptors triggers increased gamma motor neuron activity and subsequent contraction of the muscle and affiliated pain. The explanation for the effects of strain-counterstrain (SCS) in the treatment of TPs is not entirely clear, but the most common theory proposes that the positioning of the patient minimizes the tension of the tissue of interest and reduces the nociceptive input, thus preventing the pathological neural reflex arc.[5]

TPs are most commonly located near bony attachments of tendons, ligaments, or muscle bellies. TPs should not be confused with trigger points, which are normally found within taut musculotendinous tissue bands.[9] TPs can be palpated as tense, small, edematous regions in the soft tissue. TPs only refer to local areas of tenderness; no pain referral should be experienced. To date, there have been over 200 anatomical TPs identified by osteopathic physicians.[9] Interestingly, cervical radiculopathy is associated with TPs located on the same side of the apparent radiculopathy.[10] In this review, we will focus on the most common cervical TPs found in the clinical setting. 

Location of Anterior Cervical (AC) TPs:

• Anterior cervical C1 (AC1) TPs are located near the transverse processes of C1, on the posterior edge of the ramus of the mandible.
• AC2-AC6 TPs are located on the anterolateral tips of the corresponding transverse processes.
• AC7 TPs are located on the superior surface of the clavicle at the clavicular attachment of the sternocleidomastoid (SCM).
• AC8 TPs are located at the medial end of the clavicle at the sternal attachment of the SCM.

Location of Posterior Cervical (PC) TPs:

• Posterior cervical C1 (PC1) midline TP is located around the inion.
• PC1 lateral TPs are located on the occiput, midway between the inion and mastoid process.
• PC2 midline TP is located on the superior aspect of the spinous process.
• PC2 lateral TPs are located on the occiput, midway between the inion and PC1 lateral TPs on the occiput.
• PC3 midline TP is located on the inferolateral aspect of the C2 spinous process.
• PC3-PC7 lateral TPs are located on the posterolateral surface of the corresponding articular processes. 
• PC4-PC8 midline TPs are located on the inferior aspect of the spinous process of the vertebra directly above the corresponding cervical level.

• Acute or chronic somatic dysfunctions
• Hypertonic muscles
• Somatic dysfunctions with a neural component (e.g., hypertonic muscle)
• As primary treatment or in conjunction with any other treatment options

Strain-counterstrain (SCS) is widely regarded as one of the safest osteopathic manipulative treatment options. However, like any physical procedure, contraindications still exist. Contraindications for counterstrain could be divided into absolute (do not perform the procedure) and relative (may perform the procedure with caution, depending on the circumstance).

Absolute Contraindications

• Absence of somatic dysfunction
• Lack of patient consent or cooperation
• Fracture or torn ligament in the area

Relative Contraindications

• Cervical vertebral artery disease
• Severe osteoporosis
• Any rheumatologic conditions such as rheumatoid arthritis
• Ligamentous instability
• Severe illness
• Patient unable to voluntarily relax muscles

The following equipment is needed:

• Osteopathic manipulative treatment table
• Stool