SHOULDER SUBLUXATION: THE MOBILITY ANCHOR & ROTATOR CUFF SAVIOR

Why "Impingement" and "Frozen Shoulder" Are Often Mechanical Failures, Not Just Subacromial Inflammation

By Dr. James Fraser | Doctor of Chiropractic D.C. | Spine Spot Chiropractic | Basalt, CO

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The Shoulder Complex is the most mobile joint in the human body. It is designed to allow nearly 360 degrees of motion, enabling us to throw, lift, climb, and hug. However, this incredible mobility comes at a steep price: Instability.

Anatomically, the shoulder is often described as a "golf ball sitting on a tee." The humeral head (ball) is massive compared to the glenoid fossa (socket). Because of this mismatch, the shoulder relies entirely on the Rotator Cuffmuscles and ligaments to hold it in place.

When the Shoulder subluxates—usually the Humeral Head slipping Anteriorly (forward)—the mechanics collapse. The ball rolls too far forward, pinching the tendons against the roof of the shoulder (Acromion). This is the root cause of Impingement Syndrome and Rotator Cuff Tears.

At Spine Spot Chiropractic, we treat the Shoulder as a "Suspension Bridge." If the cables (muscles) are tight, it’s usually because the tower (the joint itself) is leaning.

THE ANATOMICAL ANCHOR: THE TRIPLE-JOINT COMPLEX

Biomechanics of the Shoulder Girdle

The shoulder is not one joint; it is three distinct articulations working in concert.

• The Glenohumeral (GH) Joint: The main ball-and-socket.
• The Failure: Anterior Subluxation. The head of the humerus slides forward and down. This stretches the posterior capsule and jams the anterior capsule.
• The Acromioclavicular (AC) Joint: Where the collarbone meets the shoulder blade.
• The Failure: "Step Defect." The clavicle pops up (Superior Subluxation) after a fall on an outstretched hand, creating a visible bump.
• The Sternoclavicular (SC) Joint: Where the collarbone meets the breastbone.
• The Failure: The Pivot Lock. If this joint locks, you cannot raise your arm above 90 degrees because the clavicle cannot pivot.

Fixation vs. Pain:

• Anterior Humerus: Pain at the front of the shoulder that worsens with bench press or push-ups.
• Superior Clavicle: Sharp pain on top of the shoulder when reaching across the body (seatbelt motion).
• Scapular Dyskinesis: The shoulder blade "wings" out because the base is unstable.

THE NEUROLOGICAL BLAST RADIUS

The Brachial Plexus & The Axillary Nerve

The shoulder sits directly in the path of the Brachial Plexus (C5-T1). Every nerve going to the arm must pass through the shoulder girdle.

The Suprascapular Nerve (The Cuff Killer)

• The Connection: Passes through the "Suprascapular Notch" on top of the scapula.
• The Dysfunction: Entrapment.
• The Result: Muscle Wasting. We often see patients with a "dent" in their shoulder muscle (Infraspinatus atrophy). This is because the nerve powering the muscle is being strangled by a misaligned scapula.

The Axillary Nerve (The Deltoid Driver)

• The Connection: Wraps around the neck of the humerus (Quadrangular Space).
• The Dysfunction: Anterior Dislocation/Subluxation.
• The Result: "Dead Arm." Numbness on the outside of the shoulder patch (Military Patch sign) and inability to lift the arm to the side. The deltoid simply turns off.

The Long Thoracic Nerve (Winging)

• The Connection: Runs down the side of the rib cage.
• The Dysfunction: Traction injury.
• The Result: Winged Scapula. The shoulder blade pops off the rib cage because the Serratus Anterior muscle is paralyzed.

THE ORGAN SYSTEM CONNECTION

Visceral Ramifications of Shoulder Pain

Shoulder pain is notorious for being a "Referral Site" for organ distress. We must always rule out visceral causes.

• Right Shoulder (Liver/Gallbladder): The Phrenic nerve (C3-C5) shares pathways with the liver. Gallstones often present as a deep ache under the Right Scapula or tip of the right shoulder.
• Left Shoulder (Heart/Stomach): The classic sign of a heart attack is left arm/shoulder pain. However, chronic gastric reflux (GERD) or a Hiatal Hernia can also refer dull aching pain to the Left Shoulder.
• Both Shoulders (Lungs): Issues at the lung apex can press on the brachial plexus, causing severe shoulder pain.Note: Dr. Fraser always performs a thorough history to rule out these pathologies before adjusting.

THE SYMPTOM MATRIX

"How Does It Feel?"

A Shoulder fixation feels like a "pinch" that won't let go.

The Hallmark: The "Catch" & Night Pain Sharp pinching pain when lifting the arm above shoulder height (The Painful Arc) and a deep, toothache-like throb at night that makes it impossible to sleep on that side.

Associated Symptoms:

• Impingement: A sharp stab at the front of the shoulder when reaching overhead.
• "Frozen Shoulder": Progressive loss of motion. You can't reach behind your back to tuck in a shirt.
• Clicking/Popping: A loud "clunk" when rotating the arm (Labral tear or instability).
• Weakness: Inability to hold a gallon of milk with the arm extended.
• Numbness: Tingling extending down the arm to the hand (Thoracic Outlet Syndrome).
• Neck Pain: Tension in the Upper Trapezius as the neck tries to lift the arm because the shoulder can't.

THE SPINE SPOT DIFFERENCE

Diagnosis & Correction: A Master-Craftsman Approach

The shoulder is complex. "Windmilling" the arm or generic PT exercises often fail because they try to strengthen a joint that is mechanically dislocated. At Spine Spot, Dr. James Fraser utilizes a mastery of multiple chiropractic techniques to set the bone first, ensuring the mechanics are restored before rehabilitation begins.

PHASE 1: THE FORENSIC AUDIT

Before we touch your shoulder, we must visualize and quantify the interference using a comprehensive Neuromusculoskeletal Examination.

• Orthopedic Assessment: We perform critical tests like Neer’s Impingement, Hawkins-Kennedy, and the Empty Can Test. These help us differentiate between a Rotator Cuff Tear (which needs a referral) and an Impingement Syndrome (which needs adjustment).
• Range of Motion Mapping: We measure your "Painful Arc." If pain only occurs between 60-120 degrees of abduction, it confirms the humerus is grinding against the acromion.
• Static & Motion Palpation: Dr. Fraser palpates the Bicipital Groove. A subluxated biceps tendon feels like a guitar string that has popped out of its fret. We check the AC Joint for a "step defect" and the Glenohumeral joint for Anterior shear.

PHASE 2: THE PRECISION ADJUSTMENT

Dr. Fraser is proficient in four distinct, high-level correction protocols for the Shoulder. Depending on whether you have a "Frozen Shoulder," an AC separation, or chronic impingement, we will utilize one of the following:

The Gonstead Correction (The Structural Set)

• Best For: Anterior Humerus subluxations and chronic impingement.
• The Setup: Seated or Supine.
• The Contact: Dr. Fraser uses a specific palm contact on the Head of the Humerus.
• The Vector: We bring the elbow across the body to open the joint, then drive the humerus A-P (Anterior to Posterior) and S-I (Superior to Inferior).
• The Release: The shoulder often releases with a "thud" rather than a crack. This is the sound of the ball seating back into the center of the socket. The pinching sensation usually vanishes instantly.

Diversified Technique (The Motion Restore)

• Best For: Breaking up adhesions in early-stage Frozen Shoulder and general mobilization.
• The Setup: Seated or Supine.
• The Contact: Reinforced thumb or web-contact on the Proximal Humerus or Distal Clavicle.
• The Vector: A high-velocity, low-amplitude thrust delivered in the direction of restriction. Dr. Fraser uses a specific "scoop" motion to mobilize the joint capsule while stabilizing the scapula.
• The Release: A crisp, audible release that instantly improves range of motion, allowing the patient to reach overhead with less resistance.

Thompson Terminal Point (The Drop Table)

• Best For: Patients with acute AC Joint pain (separated shoulder) or those who are muscle-guarding heavily.
• The Setup: Supine (face up) on the Thompson Table with an extremity drop piece.
• The Contact: A specific contact on the Distal Clavicle or Anterior Humerus.
• The Vector: Dr. Fraser applies a sharp thrust downward. The table's "drop" mechanism absorbs the force, utilizing gravity to set the clavicle down or push the humerus back without the need for muscular wrestling.
• The Result: A vibration-based correction that is incredibly gentle, effectively reducing the "step defect" in the collarbone.

Activator Methods (The Instrument Precision)

• Best For: Isolating the Biceps Tendon, treating AC joints in seniors, or highly sensitive patients.
• The Setup: Seated, utilizing isolation tests (arm rotation) to verify AC vs. SC vs. GH joint involvement.
• The Contact: The Activator instrument is placed directly on the Acromion, Clavicle, or Bicipital Groove.
• The Vector: The instrument delivers a lightning-fast impulse. It is faster than the body's muscle reflex can guard against. The line of drive is strictly calculated to move the bone into proper alignment (e.g., S-I for a high clavicle).
• The Result: No "cracking." Just a precise neurological reset that communicates directly with the mechanoreceptors to shut down the muscle guarding.

PHASE 3: ADJUNCTIVE THERAPIES

• Class IV Cold Laser Therapy: We target the Supraspinatus tendon and the Subacromial Bursa to reduce the inflammation caused by impingement.
• Scapular Stabilization: We prescribe specific "Y-T-W" exercises to retrain the scapula to sit flat on the rib cage, providing a stable base for the shoulder to operate.

UNLOCK THE REACH

Throw, Lift, and Live

If you can't wash your hair, reach for a seatbelt, or sleep on your side, the issue is likely a subluxated Shoulder. The ball is off the tee.

Do not let a mechanical problem freeze your life.

Restore the alignment. Restore the range.

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Spine Spot Chiropractic – Your Chiropractor in Basalt - Dr. James Fraser | 341 Market St, Basalt, CO 81621 | Call/Text: (970) 924-1015 | Schedule Online or Request an appointment