Muscle:Rhomboids

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Rhomboid major and rhomboid minor are covered here as a single clinical entity. Travell & Simons treat them as one chapter with a composite referred pain pattern, no separable clinical presentation, and shared examination and treatment principles. The anatomical distinction between the two muscles (the major has a greater rotator effect on the inferior scapular angle) does not produce distinguishable pain patterns or examination findings in clinical practice.

The rhomboids are a muscle that typically complains because of what other muscles are doing to them. Their TrPs are usually secondary to, and maintained by, sustained stretch imposed by shortened, hypertonic pectoral muscles — or by any other force that chronically pulls the shoulders forward into a round-shouldered posture. Rhomboid TrPs rarely produce a primary pain complaint and usually become obvious only after TrPs in the levator scapulae, trapezius, and infraspinatus have been inactivated. The key clinical insight is that treating the rhomboids directly without correcting the pectoral muscle shortening that is pulling them taut is treating the victim rather than the cause.

Anatomy

Rhomboid minor attaches above to the ligamentum nuchae and to the spinous processes of C7 and T1, and below to the vertebral (medial) border of the scapula at the root of its spine.

Rhomboid major attaches above to the spinous processes of T2 through T5, and below to the medial border of the scapula between its spine and inferior angle.

Both muscles run obliquely downward and laterally, away from the vertebral spinous processes toward the medial border of the scapula. The rhomboid major fibres attach to the lower portion of the medial scapular border; because of this, the rotator effect of the major on the inferior angle of the scapula is considerably greater than that of the minor.

All but the caudal ends of the lowermost fibres of the rhomboid major are covered by the trapezius muscle.

Innervation: Dorsal scapular nerve via the upper trunk of the brachial plexus; C5 root (occasionally also C4).

Primary actions:

  • Adduction (medial drawing) of the scapula
  • Elevation of the scapula
  • Medial rotation of the scapula — turning the glenoid fossa downward (rhomboid major, primarily)
  • Stabilisation of the scapula against the paraspinal soft tissues during arm abduction and flexion

Referred Pain Patterns

Essential (solid) referral zone:

  • Along the vertebral border of the scapula, between the scapula and the paraspinal muscles

Spillover (stippled) referral zone:

  • Upward over the supraspinous portion of the scapula

Must-absent feature: Referred pain extending to the arm has not been reported. If arm referral is present, other muscles must be sought.

The pain pattern somewhat resembles that of the levator scapulae — but without the neck component and without restriction of neck rotation. This comparison is the single most clinically useful differentiating observation.

Tenderness in the interscapular region may arise from three overlapping sources, all of which can coexist:

  1. TrP tenderness in the rhomboid muscle belly
  2. Referred tenderness in the referred pain zone of other muscles (particularly the scalenes)
  3. Enthesopathy at the scapular border attachment, caused by chronic sustained stretch from round-shouldered posture or pectoral muscle tension

The enthesopathy pain, like stretch weakness, gradually subsides if the muscle is maintained in a neutral position — neither under strain nor shortened.

Activation and Perpetuating Factors

Primary mechanism: forced sustained stretch from pectoral muscle shortening

The dominant perpetuating mechanism for rhomboid TrPs is not intrinsic overload but sustained stretch imposed from outside the muscle. Shortened pectoralis major muscles (whether from active TrPs or any other cause) pull the shoulders forward, maintaining the rhomboids and middle trapezius in a chronically lengthened, overloaded position. The pectoral TrPs may be entirely latent — producing no pain — yet are nevertheless overloading their dorsal antagonists.

Serratus anterior TrPs can contribute to rhomboid overload by the same mechanism.

Other activating activities

  • Holding the arm in abduction or flexion above 90° for prolonged periods — as when painting overhead
  • Prolonged leaning forward and working in a round-shouldered position without back support (writing, sewing, detailed desk work)
  • Prolonged stretch on the convex side of upper thoracic scoliosis — from idiopathic scoliosis, chest surgery, or limb-length inequality
  • Sustained tension from a shortened pectoralis major

Clinical presentation clue

Patients with active rhomboid TrPs are frequently stooped and round-shouldered, appear flat-chested, and are unable to stand fully upright because of TrP-induced tautness in the pectoralis major and/or minor. The rhomboid and middle trapezius muscles bilaterally are overloaded opposing the stronger, shortened pectoral muscles.

Clinical Examination

Range of Motion

Rhomboid TrPs cause no obvious restriction of arm range of motion and no restriction of scapular mobility. This is a must-absent finding — if restriction of arm motion is present, the primary problem lies elsewhere (subscapularis, infraspinatus, teres major, or other rotator cuff muscles).

The examiner should observe for:

  • Round-shouldered posture — the critically important postural finding; indicates shortening and tightness of the pectoralis major and sustained tension on the rhomboids
  • Scapular prominence on the convex side of any thoracic scoliosis
  • Inability to stand fully upright (pectoralis minor TrP involvement)

Test the scapula for normal mobility over the chest wall.

Rhomboid Weakness Assessment

The rhomboids are prone to inhibition and stretch weakness. Testing for weakness in the presence of near-normal remaining shoulder-girdle muscle strength is difficult because each rhomboid function is also provided by more powerful muscles. The most reliable clinical indication of rhomboid major weakness is palpation of the rhomboid major during adduction and elevation of the scapula with downward (medial) rotation of the inferior angle. Contraction of the overlying trapezius otherwise obscures rhomboid activation.

Trigger Point Examination

Best examination position: Patient seated with arms hanging forward to relax the rhomboids and abduct the scapulae away from the vertebral column. This slackens the overlying trapezius and spreads the interscapular space.

Distinguishing rhomboid taut bands from the overlying trapezius:

  • Rhomboid fibres run obliquely downward and laterally from the vertebrae toward the scapula
  • Middle trapezius fibres lie in a relatively horizontal direction
  • Lower trapezius fibres angle upward and laterally
  • Medial rotation and adduction of the humerus places the scapula in downward rotation, accentuating rhomboid fibre direction as scapular adduction is attempted
  • Abducting the arm rotates the scapula upward, accentuating the trapezius fibre direction

Palpation technique: Deep palpation across the direction of the rhomboid muscle fibres identifies firm, rope-like taut bands. The midbelly region of each band is then examined for TrP tenderness. Palpation along the vertebral border of the scapula may reveal trigger areas near the attachment — this tenderness often represents enthesopathy secondary to TrP tension and/or pectoral overload.

Boundary confirmation technique (if the muscle borders are uncertain): Patient lies prone with one hand resting behind the back. The examiner places a finger deep to the medial border of the scapula. When the patient lifts the hand up off the back, the rhomboids contract vigorously, pushing the examiner's finger out from under the scapula — confirming muscle location.

Local twitch responses: Difficult to elicit reliably because of the overlying trapezius, but are a valuable diagnostic confirmation when present.

Articular Dysfunction

Articular dysfunction associated with rhomboid TrPs can involve spinal segments C7 to T5, typically two or more segments simultaneously. The characteristic pattern is:

  • Vertebral sidebending toward the side of the involved muscle
  • Rotation away from the involved muscle

A central dysfunction is occasionally found at approximately T3, involving a single segment of vertebral extension combined with sidebending and rotation in the same direction. This produces a flattened upper thoracic spine that does not flex forward on attempted flexion, with concurrent scapular adduction. This central segmental dysfunction must be recognised and treated. Correcting it often simultaneously inactivates the rhomboid TrP.

Differential Diagnosis

Cardinal differentiating features of rhomboid TrP pain

Feature Present / Absent / Variable
Pain along the vertebral border of the scapula, between scapula and paraspinal muscles Must be present — the essential pain zone
No arm referral Must be present — absence of arm referral is a key positive feature; distinguishes from scalenes and other muscles
No neck pain component Must be present — distinguishes from levator scapulae (which adds a neck component and restricts neck rotation)
No restriction of cervical rotation Must be present — the most important single feature distinguishing rhomboids from levator scapulae
No restriction of arm or shoulder range of motion Must be present — if restriction is present, subscapularis, infraspinatus, or other rotator cuff muscles are implicated
Superficial aching pain at rest, not influenced by ordinary arm movement Must be present
Round-shouldered posture Highly suggestive when present; points to pectoral muscle shortening as the driving mechanism
Pain accessible to surface pressure (patient reaches and rubs the area) Distinguishes from serratus posterior superior, whose pain feels too deep to be reached by surface pressure
Snapping or crunching sounds on scapular movement Variable; when present, suggestive of rhomboid TrPs

Comparison with the most important differential muscles

Muscle Referral zone Key differentiating features
Levator scapulae Pain extends to the neck; restricted cervical rotation toward the opposite side; TrP in the levator at the upper medial scapular angle. Rhomboid pain stays below the neck level and does not restrict rotation.
Middle trapezius Between the medial scapular border and the thoracic spine, similar distribution Overlapping zone. Distinguish by fibre direction during palpation (horizontal vs oblique downward-lateral). Middle trapezius more active during overhead reaching; rhomboids more active during scapular retraction with downward rotation.
Infraspinatus Anterior shoulder (essential), deep joint, lateral arm/forearm, possibly radial hand Anterior shoulder pain is the essential feature — entirely absent in rhomboid TrPs. Infraspinatus TrPs are located in the supraspinous/infraspinous fossa and produce arm referral.
Scalenes Medial scapular border (spillover), anterior chest, radial forearm and hand Arm referral; anterior chest pain; upper rib restriction. Scalene referred tenderness can overlap the rhomboid zone — examine both. Scalene TrP location is in the posterior triangle of the neck, not the interscapular region.
Latissimus dorsi Inferior scapular angle, midthoracic back, medial arm to ulnar hand Pain centred at the inferior scapular angle, not the medial border; arm referral to the ulnar hand; constant aching unchanged by position.
Serratus posterior superior Deep posterior shoulder and upper scapular region Pain feels too deep to be reached by surface pressure — patients cannot rub it. This is the cardinal subjective distinguishing feature from rhomboid pain, which patients can locate and rub.

Scapulocostal Syndrome

Rhomboid TrP pain can be erroneously diagnosed as scapulocostal syndrome if TrP examination is overlooked or improperly performed. Before attributing interscapular pain to the "scapulocostal syndrome" label, thorough TrP examination of the rhomboids, levator scapulae, middle trapezius, infraspinatus, and scalenes should be completed.

Fibromyalgia Overlap

In patients with chronic axial pain and widespread complaints consistent with fibromyalgia, the full tender point count and ACR criteria should be applied. In one study of 96 subjects, 20% of patients with myofascial TrP pain also met criteria for fibromyalgia. Treatment of patients with both conditions requires special consideration beyond TrP management alone.

Entrapment

No nerve entrapments have been attributed to the rhomboid muscles.

Treatment

Treatment Sequence: Address the Cause First

Because the rhomboids are prone to inhibition and stretch weakness, the treatment sequence is critical:

  1. First: Inactivate pectoral muscle TrPs and restore normal resting length to the pectoralis major and minor — this relieves the sustained stretch driving the rhomboid problem
  2. Second: Check and inactivate any serratus anterior TrPs (lower half particularly)
  3. Third: Distinguish TrP tenderness in the muscle belly from enthesopathy tenderness at the scapular border attachment — they require different treatment emphasis
  4. Fourth: Address rhomboid TrPs — preferably with non-stretching techniques if the muscle shows inhibition or weakness
  5. Finally: Correct round-shouldered posture — this is absolutely necessary to fully resolve any enthesopathic component

Do not stretch the rhomboids further if they are already being overstretched. Additional stretch of a weak, inhibited muscle aggravates the problem. Recovery of the enthesopathy component depends on relieving the persistent tension, not on stretching more.

Trigger Point Release

Non-stretching techniques (preferred when the muscle shows inhibition or weakness):

  • Trigger point pressure release — applied directly to taut band midbelly TrPs
  • Deep massage to taut bands
  • Hold-relax applied to the tense muscle
  • Indirect counterstrain techniques

Spray and stretch (only if increased muscle tension is present, not weakness):

Patient seated, upper thoracic spine flexed, arms either hanging between the knees (for rhomboid minor) or crossed in front of the chest (for rhomboid major). The patient humps the back (flexes the thoracic spine) and lets the arm weight pull the scapulae forward and laterally. Vapocoolant spray is applied downward in slow parallel sweeps over the rhomboid muscles in the direction of their fibres; the uppermost sweeps continue across the scapula to cover the lateral referred pain extension. The patient inhales, then exhales slowly while reaching farther across the front of the body to take up slack.
Critical caution: Do not apply additional manual pressure against the scapula to increase the stretch — these muscles are readily overstretched. Gravity-assisted release only.

Postisometric relaxation (myofascial release):

The operator lightly resists scapular adduction while the patient slowly breathes in and looks upward to the right (for right rhomboid). The patient then looks downward to the left and slowly breathes out, relaxing fully. As the muscle releases, the operator's hand follows the movement of the scapula into abduction, taking up the slack as the patient exhales.

Following release, apply moist heat, then move the scapula through two or three repetitions of full active range of motion.

Trigger Point Injection

Technique:

  1. Accurately locate the TrP in the midfibre portion of the muscle and fix it against the chest wall between the fingers of the palpating hand
  2. Use a 3.8 cm (1½ inch) needle directed almost tangential to the surface
  3. Aim the needle toward a rib to avoid penetrating an intercostal space
  4. Pleural safety technique: Place the 2nd and 3rd fingers into the intercostal spaces above and below the TrP injection site — this essentially eliminates the risk of pleural penetration
  5. A local twitch response (LTR) confirms accurate needle placement; injection is much less likely to succeed in the absence of an LTR

0.5% procaine or 1% lidocaine reduces post-injection soreness compared to dry needling. Following injection, apply moist heat, then three cycles of full active range of motion.

Note on Satellite TrP Relationships

Rhomboid TrPs occupy a secondary position in the regional satellite network:

Rhomboids as satellites (driven by key TrPs elsewhere):

  • Pectoralis major — latent or active TrPs shorten the pectorals, pulling the shoulders forward and placing the rhomboids under sustained stretch; the most important key TrP relationship
  • Upper trapezius — can act as key TrP inducing satellite TrPs in the rhomboid minor specifically; inactivating the trapezius TrP usually simultaneously inactivates the satellite rhomboid minor TrP
  • Serratus anterior — TrPs contribute to rhomboid overload by abducting the scapula

Important treatment implication: Rhomboid TrPs that are refractory to direct treatment should prompt assessment of pectoralis major and upper trapezius as key TrP sources before persisting with rhomboid-directed treatment.

Patient Education

Posture Correction

Correction of the slumped forward-head, round-shouldered posture is absolutely necessary for lasting relief of rhomboid TrPs and for resolution of any enthesopathic component. See Perpetuating Factors.

  • Use a lumbar pillow or thoracolumbar support when working at a desk or driving — this corrects the seated slump that places sustained tension on the rhomboids
  • Avoid any chair that pushes the upper torso and shoulders forward; a slight backward slope of the backrest with lumbar support is needed
  • Interval timer technique for desk workers: set a timer across the room to ring every 20–30 minutes, requiring the patient to stand and reset it — relieves sustained muscle strain without interrupting the train of thought

Home Self-Release

Tennis ball self-release: Patient lies on a tennis ball placed on the floor (or a large thin book on the bed), rolling it along the medial border of the scapula to locate individual TrP tender spots. Sustained pressure is applied to each tender spot until tenderness fades (usually 20–30 seconds; occasionally up to a minute), then the ball is rolled to the next spot. For bilateral involvement, a cold pair of tennis balls can be used simultaneously. A Theracane® is an alternative tool for the same purpose.

Pectoral Stretching

If the patient has pectoral muscle involvement, daily use of the In-doorway Stretch (Fig. 42.9 in Travell & Simons) following a warm shower, bath, or application of moist heat maintains pectoral muscle length and reduces the chronic stretch load on the rhomboids.

Middle-Trapezius Stretch Exercise

Once the rhomboids have recovered sufficient function to tolerate a gentle, augmented stretch safely (not before), the patient can be taught the Middle-trapezius Stretch Exercise (Fig. 6.15 in Travell & Simons) in conjunction with a postisometric relaxation technique — this also releases any rhomboid tightness.

Scoliosis Correction

If scapular protrusion is due to a functional scoliosis caused by limb-length inequality or asymmetrical pelvis, levelling the pelvis and straightening the spine with appropriate lifts corrects the sustained stretch on the convex-side rhomboids (see Volume 2, Chapter 4 of Travell & Simons).

Satellite Trigger Points

  • Pectoralis major — most important key TrP source driving rhomboid overload; treat first
  • Pectoralis minor — contributes to round-shouldered posture and inability to stand upright
  • Upper trapezius — key TrP for rhomboid minor satellite; treat together
  • Serratus anterior — contributes to rhomboid overload; check lower half particularly

References

  • Travell JG, Simons DG. Myofascial Pain and Dysfunction: The Trigger Point Manual, Volume 1: The Upper Half of Body. 2nd ed. Baltimore: Williams & Wilkins; 1999. Chapter 27.
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