Syntropy

Syntropy Chiropractic is a hand-only adjusting system built in Barcelona by Dr. Aaron Morris and Dr. Patrick McMahon. It removes rotation from cervical adjusting entirely. Every upper cervical correction runs along one line, lateral to medial and superior to inferior, aimed at the opposite AC joint, following the plane of the uncovertebral joints. The founders call it a tonal approach to structural adjusting, and they train the chiropractor’s own nervous system alongside the setup.

Syntropy began when two Barcelona chiropractors reverse engineered what their mentors did without thinking

Dr. Aaron Morris graduated from Life Chiropractic College West and moved to Barcelona, where he built one of the busiest family practices in Europe. A near fatal illness in 2012 changed what he wanted from the work. He now runs a low overhead office he calls a Zen Practice. Dr. Patrick McMahon graduated from Parker College of Chiropractic and practices in the same city. Between them they count 50 years of clinical experience.

Their own account of the founding is unsentimental. No one is born an amazing adjuster. They struggled to work out how their mentors did what they did, they obsessed over it, and they reverse engineered what the masters did unconsciously. Syntropy takes its name from the opposite of entropy, the movement of a system toward greater order.

The organization went public fast. Its website was live by April 30, 2018, the date of its first Internet Archive capture. Seminars ran in Germany and Amsterdam that year. By 2019 the same two men were teaching in London, Paris, Toulouse, Bournemouth, Birmingham, Melbourne, and Dallas. Their published count now stands at 8,000 chiropractors trained, up from the 7,000 named in an earlier training video.

The mentors Syntropy names out loud

Four teachers show up repeatedly in Syntropy’s own instruction. Arno Burnier crossed from France to study at Sherman College in its earliest years and died on July 21, 2024, aged 73. He gave both founders the phrase they still use for soft hands and the four-element scheme that became the Tissue Matrix. Jay Komarek, a 1977 Western States graduate, gave Morris the rule that every adjustment has a beginning, a middle, and an end.

Reggie Gold supplied the line McMahon quotes against spinous-process palpation, that the work is lining up the holes in the bones rather than the bones. Christopher Kent introduced McMahon to the four-way division of techniques into tonal, segmental, global, and postural. Syntropy answers it by claiming all four at once. Richelle McMahon is credited inside the training itself. She worked out by watching the founders adjust that the force runs through the whole hand rather than through the thumb, and the correction became a teaching point.

Syntropy’s core contribution is a cervical vector taken from the uncovertebral joints

Syntropy aims its cervical thrust along the uncovertebral joints rather than up the facet plane. These are the paired ridges Hubert von Luschka described, present at the C3 through C7 levels between the uncinate process below and the vertebral body above. McMahon teaches that these joints sit deep at the level of C2 and grow progressively shallower toward C7, and that every one of them lines up toward the opposite acromioclavicular joint. That single observation sets the vector for the entire cervical spine.

Occiput, atlas, and an anterior axis share one line of drive

The consequence is an unusually compact upper cervical system. Occiput, C1, and an anterior C2 all take the same vector, lateral to medial and superior to inferior, behind the opposite shoulder. What changes between them is mass and contact, not direction. The occipital contact is broad, closer to palming a basketball, because a skull is a large mass to move. The atlas contact is a fingertip laid on the posterior arch, found by bisecting the line from the mastoid tip to the spinous process of C2.

Coupled movement is the reason the vector works

Lateral flexion in the cervical spine is coupled with rotation. Syntropy teaches the coupling in the direction the joint is built for. Laterally flex to one side and the spinous process should move away from that side. The ipsilateral facet compresses and glides down while the contralateral facet glides up, and the force runs straight down the uncovertebral joint. A finite element study of the C5 to C6 segment by Clausen and colleagues in 1997 found the uncinate processes and Luschka joints to be major determinants of coupled motion in the lower cervical spine.

McMahon sends students to Kapandji’s third volume on the spinal column, pelvic girdle, and head, and tells them to memorize it. His own summary of the anatomy is that nature contains no straight lines.

Syntropy is not Diversified, and the founders drew that line themselves

Morris and McMahon recorded a rebuttal to the comparison. Their objection has three parts, and none is about force level.

First, Syntropy performs no rotary cervical movements at all. The move both men were taught in school, laterally flex then rotate the nose away, is the specific thing Syntropy replaces. Morris adjusted that way for years and got good results. He reports that patients standing up dizzy after a cervical adjustment stopped being a regular event once he moved the axis of rotation to the patient’s own nose.

Second, Syntropy claims a reproducible analysis with a defined endpoint. The founders are explicit that they are not running an adjusting seminar with no assessment attached. There is a pre-check and a post-check, and the practitioner is meant to know whether the segment cleared.

Third, the mechanics of the doctor are treated as part of the technique rather than as ergonomics advice. Morris describes running roughly 500 visits a week and taking 125 anterior dorsal setups a day against his own chest, until he could not draw a full breath for the first hour after work. Syntropy’s answer to that is structural: raise the table, widen the base, and stop lifting patients off it.

The founders sum the difference up in six words. Syntropy is a tonal approach to structural adjusting. Diversified remains the profession’s most widely taught full spine method, and Syntropy is best read as a dissent from one of its cervical conventions rather than a rejection of manual adjusting.

The Window is the moment the tissue yields, and Syntropy waits for it

The Window is Syntropy’s name for the instant when the musculature around a segment lets go and the joint opens. The instruction is to set the contact, mold the tissue, and then wait rather than push. McMahon describes looking for an invitation from the body instead of the breathe-in-breathe-out countdown most practitioners use. The opening sometimes holds for a while and sometimes barely registers.

Finding it requires fingertip contact, and the physiology backs the requirement. Johansson and Vallbo recorded 334 low-threshold mechanoreceptive units from the human median nerve in 1979 and estimated the density at the fingertip at 241 units per square centimeter against 58 in the palm. Roughly four times the palm’s receptor density sits in the fingertip. Syntropy adjusts from there because that is where the reading is.

Surface area is what makes the contact non-threatening

A specific contact and a small contact are different things, and Syntropy separates them. The fingertip that fires stays specific. Everything around it spreads. The thumb lies on the zygomatic arch, the fingers wrap the skull, the palm molds to the side of the head, and the adjusting fingertip disappears inside all that surface area.

The founders call the effect the primate grooming response, and they tie it to the interoceptive C-fiber system. Löken and colleagues showed in 2009 that unmyelinated C-tactile afferents in human skin fire hardest at stroking velocities between 1 and 10 centimeters per second, and that those same velocities are rated most pleasant. Broad slow contact is a different neural input from a point load, and it arrives on a different fiber class.

The Tissue Matrix sorts every body onto two axes before the contact is set

Burnier taught the four elements, water, earth, fire, and wind, as a way of reading body types. McMahon found the scheme evocative and imprecise, so he rebuilt it as a 2 by 2 grid. The Tissue Matrix is that grid, and it decides two variables before a single contact is made.

The first axis is adiposity, and it sets how far you compress. Inert tissue between fingertip and bone has to be taken out of the system or the thrust arrives as a whiplash against the joint. The second axis is tone, and it sets how far off neutral you travel. High tone means the window opens close to neutral, and traveling further makes the setup harder. Low tone means the window is a long way out, and adjusting a very flexible person from neutral simply feeds force into rubber.

The four combinations give four instructions. Lean and high tone, the rock climber, gets a light fingertip and almost no travel. Heavy and high tone, the powerlifter, gets deep compression and almost no travel. Lean and low tone, the yoga practitioner, gets a light fingertip and a long excursion over the fulcrum. Heavy and low tone gets both compression and excursion. Compression stops the moment the practitioner’s own finger flexors register resistance.

Wave Dynamic Palpation finds the one segment that will not relax

Syntropy’s cervical analysis is a motion palpation performed with the patient at rest, without x-rays. The headpiece is set to that person’s own neutral. A dropped headpiece locks the neck down and a raised one loads it, and either error makes the reading useless. The practitioner compresses through the adipose layer until the joint reports, then oscillates side to side along the spine.

What the hand is looking for is a single negative finding in a relaxed field. If the person is genuinely at peace, everything moves like butter and one area does not. That area is the segment that has lost the ability to move freely, and McMahon names it directly as the subluxation. His working definition is a segment showing greater resistance to stretch, which he reads as higher tone at that level. The same palpation run after the adjustment is the post-check.

The formal course listing states the analysis plainly. Syntropy’s upper cervical curriculum covers the biomechanics, neurology, and hydrodynamics of C0 through C3, a cervical system of analysis without x-rays, adjustments for occiput and atlas, and anterior and posterior listings for the axis. That places it beside hand-analysis methods like Motion Palpation rather than beside the x-ray-driven upper cervical systems such as Atlas Orthogonal.

Every Syntropy setup stops at the Sweet Spot, the last moment before muscle engages

The Sweet Spot is the end of joint slack and the beginning of muscular effort. Syntropy stops there. Going short of it leaves the segment loose, and a thrust into a loose segment is a whiplash. Going past it recruits the practitioner’s own muscles to hold position, and McMahon’s argument is that the patient then mirrors the tension back. The practitioner is the primary oscillator in the room, so a tight operator produces a tight neck and has to force harder against it.

Syntropy does not treat the audible release as the objective. Kawchuk’s 2015 cine MRI study, imaging at 3.2 frames per second, showed the sound is a gas cavity forming inside the joint rather than a bubble collapsing. The pop reports that the surfaces separated. It reports nothing about where the force went, which is why Syntropy’s post-check is the palpation.

The Feeling Fulcrum, two-point contact, and the three-point harness

The Feeling Fulcrum is the marking finger. It is placed on the segment to be folded, and the support hand brings everything above it over as one unit until the joint barely engages. From that instant only the adjusting hand moves. Pulling with the support hand as well, which Syntropy calls scissoring, drags the setup back out of the Sweet Spot.

The two-point contact is thumb pad plus index and middle fingers laid along the mandible, with the hand pronated far enough that the fingers reach up toward the jaw. Loading the thumb pad reflexively fires opponens pollicis, which is why the contact protects the thumb. The nail edge does none of that. Force travels through the arch formed by both points and through the whole hand, not down the thumb.

Three points of contact make the setup feel safe: the adjusting hand, the support hand, and the practitioner’s torso against the patient’s head. Together they block the flexion-extension plane and the lateral flexion plane, and the head stops guarding.

Order of operations, and the Roly Poly

Cervical setups run in sequence and never simultaneously. Pure rotation first, taken with a step rather than with the arms. Then the arms form the plane. Then lateral flexion over the fulcrum, driven by bending a knee. Rotating and laterally flexing together is the error Syntropy corrects most often, because it cranks the neck instead of opening it.

The thoracic equivalent is the Roly Poly. The patient is held folded in flexion so the interspinous and supraspinous ligaments stay taut, then extension is delivered through one segment only. Letting the patient rock back into extension before the thrust spreads the force across several segments. The practitioner’s sternum and forearm converge on a single focal point, and the drive happens as the body rocks back rather than as the arms push.

Syntropy trains the chiropractor’s nervous system with sport science drills

Syntropy organizes its teaching around three competencies: State, Mechanics, and Psycho-Motor Skill. The third is the unusual one. The founders treat adjusting as a trainable motor skill and borrow their drill design from sport science.

Relaxation is an active skill, and it is trained separately

McMahon separates two kinds of stiffness. Tonic rigidity is baseline muscle tension. Coordination rigidity is the antagonist resisting a movement the practitioner has not yet learned. He trains the first with shake-out drills across hands, arms, traps, face, and core, done every morning and before every adjusting shift. His physiological argument is that relaxation costs ATP and depends on calcium pumps, which is why rigor mortis follows the loss of energy rather than the loss of tension.

Coordination rigidity gets three rules. Always drill against resistance, because the nervous system should never learn to pull a strike. Vary the speed, because always training at maximum builds a speed barrier. Stop at the first sign of slowing or tension, and cut the working set to half the number at which form breaks. They insist speed is a byproduct of skill and never the target.

The external target is Gabriele Wulf’s finding, applied to the adjustment

Syntropy tells students to aim at the opposite AC joint and to think about nothing else. Gabriele Wulf spent two decades showing that an external focus of attention outperforms an internal one across skills and skill levels. Wulf, McNevin, and Shea reported in 2001 that external-focus learners produced faster probe reaction times, evidence of more automatic control. Her constrained action hypothesis holds that attending to your own body interferes with the automatic processes that would otherwise run the movement.

The founders met the idea in Sweden, in a kettlebell drill run by a coach of Olympic athletes. They describe a near-maximal lift feeling roughly half as heavy once the target moved from the body to a sticker on the ceiling. Wulf’s 2013 review of fifteen years of work is the fuller record. Syntropy’s contribution is the translation: the external target for a cervical adjustment is the opposite AC joint, and it is also the direction the uncovertebral joints already point.

Table height and joint angle are part of the technique

Morris and McMahon run their tables on roughly an 8 degree incline. Side posture height is set near the midpoint of the femur, higher for a large frame and lower for a small one. For cervical work the headpiece sits around the height of the practitioner’s greater trochanter. Elbow angle is held near 135 degrees, which McMahon justifies by actin and myosin overlap and rate of force development, the same ready position an explosive athlete adopts.

Where Syntropy meets the Unified Model of Tone

Syntropy and the Unified Model of Tone were built independently and arrive at several of the same positions. The correspondences below are ours, not the founders’.

Wave Dynamic Palpation measures tone directly

McMahon’s definition of a subluxation is a segment with greater resistance to stretch, read as higher tone at that level. The model defines subluxation the same way, as a distortion in tone rather than a bone out of place. Reggie Gold’s holes-in-the-bones line, which Syntropy quotes, makes the same point about the limits of osseous landmarks. Both systems reach it from the hand rather than from an image.

The Window is tone reporting its own state

The model holds that the nervous system continuously registers its own condition and that a correction lands when the system is in a state to receive it. The Window is that state, felt through the fingertip. Waiting for the invitation rather than manufacturing an opening is the model’s position on the intervention stated in procedural terms.

The Tissue Matrix is input quality made operational

The model holds that the quality of an input decides what the system does with it, and that identical force delivered into different states produces different results. The Tissue Matrix is a working chart of exactly that. Two readings of the person’s tissue, taken before contact, change compression depth and excursion distance. Syntropy turned that variable into a chart a practitioner can read at the table.

Analysis, not force, is where the accuracy lives

Syntropy insists it is an analysis system with an adjustment attached rather than the reverse. The model’s account of specificity makes the same claim. Specificity is correspondence between what the system needs and what arrives, and assessment is where that correspondence is decided.

What the model predicts

The Unified Model of Tone predicts that Syntropy’s uncovertebral vector and its Sweet Spot setup produce a measurably different afferent volley from a rotary cervical adjustment matched for peak force. Surface electromyography of the cervical paraspinals and heart rate variability recorded across the 60 seconds after delivery are the instruments that would show it.

The model further predicts convergence rather than improvement. Where a group is measured before and after, people who start with high cervical resting tone should come down and people who start low should come up, with the spread across the group narrowing. That bidirectional signature is what distinguishes an input that restores regulation from one that pushes a value in a single direction. It is a prediction about regulation, and it is the model’s, not the founders’.

Who carries Syntropy forward

Morris and McMahon remain the principal instructors. They teach out of Barcelona across the United States, the United Kingdom, Spain, the Netherlands, Puerto Rico, and Australia, with online delivery through the Adjusting Mastery Academy. Listed 2026 and 2027 dates include Barcelona in September, San Francisco in November, Heathrow and the Gold Coast in December, and Chicago in March.

The curriculum splits into two tracks. The full spine track runs Module A, The Essentials Perfected, then Module B, Adjust Anyone Anywhere, then Module C, Unlocking Transitional Zones, with all three required for full spine certification. The upper cervical track runs the Occipital Lift, a one-day seminar with no prerequisites, plus an advanced version and a dedicated Upper Cervical Specific day for the full spine chiropractor. Separate workshops cover side posture, extremities, and cervical adjusting. Enrollment is restricted to licensed chiropractors and students at accredited programs.

Sherman College of Chiropractic hosts Syntropy as continuing education, listing a three-day Occipital Lift and Module B course in Atlanta for April 24 to 26, 2026. Burnier studied at Sherman when the college was new, which closes the circle.

How this page relates to the rest of the library

Diversified is the method Syntropy defines itself against, and reading the two pages together shows exactly which cervical convention is in dispute. Gonstead is the analysis system Morris and McMahon name as a model of clarity, and it reaches the same demand for a defined endpoint through listings and x-ray rather than through the hand. Motion Palpation is the closest relative to Wave Dynamic Palpation, and the difference is that Syntropy palpates for tone at rest rather than for end-feel through range.

Atlas Orthogonal shows what upper cervical work looks like when the vector comes from radiographic measurement instead of from anatomy at the table. Zone carries Thurman Fleet’s innate-to-innate premise, which Syntropy cites when it argues that what the practitioner believes reaches the patient. The technique index places all of them in one lineage.

Three neurology pages carry the physiology under the method. Proprioception explains what a joint reports back after it moves. The somatosensory system explains why the fingertip reads what the palm cannot. The cerebellum explains why an external target beats thinking about your own arm.