Sacro-Occipital Technique

The Sacro-Occipital Technique sorts each patient into one of three categories, then corrects the pelvis with padded wedges and light cranial contacts instead of a thrust. Major Bertrand DeJarnette named it in 1929 and kept revising it for 55 years. SOT holds that one continuous membrane and one circulating fluid join the sacrum to the occiput, so a fault at either end of the spine reports at the other.

Sacro-Occipital Technique started with a pain that moved from a man’s pelvis to his skull

DeJarnette wrote the case into his notebook in April 1928. The patient arrived with a painful left ilium and leg. DeJarnette was then testing vasomotor responses along the spine, and he found an area over the third left sacral foramen that reacted violently to his contact. He recorded that the leg and pelvis pain vanished, and that in the same instant it reappeared in the man’s left occipital bone.

He felt along the back of the skull and found a fiber he described as the size of a cigar and as painful as a fractured hip. He pressed it hard, and by his record the head pain went. Ten days later the man returned with a splitting headache, and cold applied to that same left sacral area settled it again. DeJarnette saw him about 27 times over three years and wrote that he could still reach the man’s pain from the sacrum. Something ran between the two ends of the spine, and finding it became the work of a career.

An engineer came to chiropractic as a patient first

DeJarnette trained as an engineer before he trained in anything clinical. In high school he took a four-year scholarship as an apprentice in experimental engineering. He was born on December 23, 1899, and raised in Havelock, Nebraska. Major was his given name, not a rank. In 1918 he moved to Detroit to work in the automobile industry, and a factory explosion left him severely disabled. He went to the Dearborn College of Osteopathy in Elgin, Illinois, for treatment. Students were treated free, so he enrolled, and he graduated as an osteopath in 1922.

His back was still bad. In Lincoln, Nebraska, a chiropractic student talked him into chiropractic care, and he wrote that six months of it put him right. He took his chiropractic degree from the Nebraska College of Chiropractic in 1924 and opened practice in Nebraska City in 1925. Chiropractic saved his life, he said later, and he entered research because a profession that young had to hold unexplored territory.

The 1929 experiment split the spine at the ninth thoracic segment

DeJarnette found two control points that year and named the method after them. In early 1929 he read a short German-language book on spinal cord tracts by an author he recorded only as Bing. Through that year he used electrical stimulation to drive muscle responses and follow where they traveled. He concluded that impulses entering the cord below the ninth thoracic involved the hypogastric plexuses and the sacrum, and that impulses entering above it went straight upward. Pain arising below that line answered to sacral position. Pain arising above it answered to the position of the occipital condyles on the atlas.

He called the method Sacro Occipital Technic, spelled with a final c on his own insistence, and founded the Sacro Occipital Research Society in the same year.

The category system is Sacro-Occipital Technique’s central contribution

SOT asks which of three whole-body failure patterns the patient is in, and asks it before asking about any single bone. DeJarnette settled the system into final form in his 1979 cranial manual and his 1984 SOT manual. Each category names an anatomy, a mode of failure, and a correction. The analysis runs again at the end of the visit to confirm the body moved.

Category one names a dural and respiratory failure

DeJarnette located category one in the anterior synovial aspect of the sacroiliac joint, which he called the sacral boot mechanism. A subluxation there strains the spinal and cranial dura and impedes cerebrospinal fluid circulation through the whole system, disturbing what SOT calls the primary respiratory mechanism between sacrum and occiput. The distortion then shows at the occiput, the atlas, and the sacrum together. Category one patients present with restricted breathing and autonomic complaints instead of clean one-sided back pain.

Category two names a weight-bearing failure

DeJarnette placed category two in the posterior ligamentous weight-bearing part of the sacroiliac joint, not the synovial part. The joint has gone unstable, and the sacrum has lost its working relationship with its matching ilium. Symptoms worsen with standing and loading, because what has failed is the body’s ability to hold itself up against gravity. Jerry Hochman, who has taught inside the Life University technique curriculum for four decades, tells students that roughly 85 percent of the patients they will ever see arrive as category twos.

Category three names a disc failure

The disc is involved by the time a patient reaches category three, and the nerve root is compressed or stretched. DeJarnette called it complete failure of compensation. This is the hot low back that will not tolerate loading, and it draws the most conservative hand in the system. A category three makes an existing category one or two worse.

The SOT classroom screen reads muscle response, body sway, rib heads, leg raise, and arm fossa before any correction

SOT commits to nothing until the body has been read from several directions. The doctor tests muscle response against three landmarks in turn, watches which way the standing body sways, and palpates the rib heads. The patient then raises both legs with and without compression through the neck, and the arm-fossa test is run supine.

Each step points somewhere. A body that sways side to side reads toward category two. A body that rocks front to back reads toward category one. Rib heads that will not move read toward category three, one-sided motion toward category two, bilateral motion toward category one. Prone leg length, heel tension at the Achilles, a calf sign, and tenderness at the fifth lumbar fill in the rest. Trapezius fiber analysis adds seven numbered zones between the acromioclavicular junction and the first rib, each keyed to a cervical, a thoracic, and a lumbar level. A single test never decides the category.

SOT blocking corrects with position and time instead of force

Pelvic blocking is the signature procedure, and the doctor’s main act during it is waiting. Two padded wedges, known throughout the profession as DeJarnette blocks, go under the pelvis at angles the category dictates. No thrust is delivered. The patient’s own body weight and respiration work against a fixed wedge until the indicators change.

Each category has its own wedge placement and its own clock

Category one blocking is done supine, wedges under the anterior superior iliac spines at about 45 degrees. The patient rests there roughly five to ten minutes while the doctor works the occipital fibers and cranial contacts. Category two blocking is also supine, one wedge under the short leg side and one angled at 45 degrees toward it. Those blocks come out as soon as the arm-fossa test re-strengthens, often within 30 to 60 seconds, because what resets is proprioceptive rather than structural. Category three blocking runs 10 to 15 minutes, both wedges at 45 degrees with the lower one on the short leg side.

Never adjust over a block, and never move one to reach a segment

SOT teaches three hard rules for the blocked patient. Never adjust over a block. Always correct the major side first. Never move a block to make an adjustment. All three protect the same thing, which is the position, and shifting a wedge discards the very arrangement that was doing the work.

Sturesson measured the sacroiliac joint at 0.7 millimeters of travel

Sturesson, Selvik, and Udén used roentgen stereophotogrammetry on 25 patients with sacroiliac disorders. They recorded mean rotation of 2.5 degrees and mean translation of 0.7 millimeters, with no difference between symptomatic and asymptomatic joints. A wedge cannot push a sacrum anywhere it could not already go. What a wedge can do is hold a position long enough for the system to accept it. DeJarnette reached that conclusion from the table decades before the measurement existed. Writing in 1958 he stated flatly that “force is an unnecessary part of chiropractic,” and named the two objectives of a correction as direction and position.

The occipital fibers made the back of the skull SOT’s main indicator

From 1930 DeJarnette palpated the occiput before every adjustment he gave. The upper occiput carried an ordered series of seven fibers on each side, and the order disappeared lower down. Insulting an upper thoracic segment raised a lateral occipital fiber. Insulting a lower lumbar or the sacrum raised a medial one. By the end of 1930 he had charted the reflex pathways between spine and skull, and he published the system in 1931.

The move that mattered came next, and he called it his one great step forward. He stopped using the occiput to treat and started using it to find. The occiput became an indicator of where the trouble was instead of a place to push. By 1948 he had divided it into three lines named analytical, diagnostic, and treatment.

A line two finding sends the doctor to the viscera

Line one and line three findings direct spinal correction. A line two finding, which DeJarnette held always carries a palpable nodule at its most tender point, sends the doctor into Chiropractic Manipulative Reflex Technique. CMRT neutralizes the fiber, addresses the vertebra the chart pairs with it, then works the soft tissue and reflex points tied to the organ. DeJarnette built that body of work out of the visceral manipulation he published in 1939.

One dural sleeve runs from the foramen magnum to the second sacral segment

DeJarnette treated two structures a spine’s length apart as one unit because a single membrane runs between them. The spinal dura anchors at the rim of the foramen magnum, again at the bodies of the second and third cervical vertebrae, and again at the sacrum. The dural sac ends there, at the second sacral segment. Change tension anywhere along that sleeve and it has changed everywhere along it.

Anatomy has since supplied the connections the argument needs. Hack and colleagues dissected 11 cadaveric head and neck specimens in 1995. They found a connective tissue bridge running from the rectus capitis posterior minor muscle to the dorsal spinal dura, present in every specimen. Tubbs and colleagues described the dentate ligaments, roughly 21 pairs, suspending the cord inside its dural sleeve. Alf Breig established that the cord is a tensioned structure, and that raised tension rather than compression alone carries the primary neurophysiological consequence. None of that work was done on SOT. All of it is the mechanism SOT’s reasoning depends on.

The cough test reads dural tension at the fifth lumbar

The patient lies prone, the doctor rests a thumb on the fifth lumbar spinous process, and the patient coughs. The whole test takes about five seconds. A spinous that jumps toward the ceiling is recorded as sacral base positive. One that jerks toward the head is sacral base negative. A response carrying both is neutral, and the blocking changes accordingly. Respiratory enhancement follows the same logic. Pressure goes to the sacral apex on inhalation and to the sacral base on exhalation, so the input arrives on the phase of breathing that carries it.

In 1941 all 16 volunteers grew an atlas finding from a lumbar strain

DeJarnette set out that year to create fifth lumbar subluxations instead of correcting them, because he wanted to know what one actually looked like. He examined over 200 people to find volunteers free of lumbosacral symptoms, kept 18, and discarded 2 whose spines photographed too variably. The remaining 16 stayed with him for close to two years. Each received the same adjustment daily for four days, designed to carry the fifth lumbar spinous to the right.

Eleven of the 16 showed radiographic rotation, and eleven developed left pelvic rotation, the opposite of what he had predicted. One finding was universal. Every one of the 16 developed palpatory tenderness over the left transverse process of the atlas, and none had it beforehand. Five went on to acute low back failure within four months. The distortion he had induced was real, and it lasted. A strain manufactured at the bottom of the spine reported at the top of it in every subject.

Where the Sacro-Occipital Technique meets the Unified Model of Tone

SOT and the Unified Model of Tone answer the same questions from different directions. They disagree in one place, and the disagreement is about where in a body a correction has to land.

SOT names a governing axis, and the model names no lynchpin

DeJarnette held that the primary subluxation is best located and corrected at the two ends of the spine. The sacrum and the occiput form the governing relationship in the body, joined by the dura and the cerebrospinal fluid. That is SOT’s position, and the category system, the blocking, and the cranial work all follow from it.

The Unified Model of Tone holds that there is no single lynchpin. Tone is the organization of the whole tension network, and a network has many places where a well-matched input can reach the entire system. That is our position, and we hold it at full strength.

The two fit together better than they look. A single-lynchpin account has to explain why the other 32 techniques in this library also get results, and it cannot. The no-lynchpin account explains it directly. There are several points of high influence rather than one, so SOT’s wedges, H.I.O.’s atlas, Logan Basic’s sacral apex, and Diversified’s restricted segment can all be genuine doorways into one system at once. Tonal chiropractic reads every named technique as a different analysis, a different philosophy, and a different force application making an input into one body. The differences are differences of doorway, not differences of kind. The model absorbs SOT’s results without needing SOT’s exclusivity.

A wedge shows that force and correspondence are separate axes

The model defines specificity as the correspondence between the informational structure of an input and the constraint the body is holding. Not accuracy, and not magnitude. A technically perfect input delivered to the wrong place is noise. Force beyond what the system needs to receive the message degrades the message.

SOT blocking demonstrates that claim more cleanly than anything else in manual practice. A padded wedge delivers almost no force. Its entire active content is angle, side, and duration, and the energy comes from the patient’s own respiration and body weight. If magnitude were the active ingredient, a block could deliver nothing at all. Whatever a block delivers, the category analysis is what aims it. Specificity lives in the reading that precedes the input, not in the hands that deliver it, and assessment is the seat of accuracy.

The category system is triangulation across six partial windows

SOT points six indicators at one variable and treats the category as whatever they agree on. Standing sway, rib head motion, leg length, heel tension, the arm-fossa test, and the cough response at L5 each carry their own error, and the last of the six sits outside the five-step screen. The model holds that every window onto the body’s state is partial, so the discipline is triangulation across several rather than confidence in any one. The doctor is not collecting six facts. The doctor checks whether the readings converge.

This also explains a pattern the reliability literature keeps producing. Cooperstein, Blum, and Cooperstein compared the arm-fossa test against the Gillet test in 14 participants. They found a kappa of 0.55, moderate consistency, with a positive arm-fossa able to sit alongside a negative Gillet. Two partial windows onto one state should agree moderately, not perfectly. Perfect agreement would mean one of them was redundant.

The model reads the dura as one member of a tension network

The dura transmits tension along the entire length of the central nervous system and changes the mechanical environment of the cord itself. The model places it inside a continuous tension network holding muscle, tendon, ligament, joint capsule, fascia, and the connective tissue investments of the organs. DeJarnette reasoned about the same structure hydraulically, as a container whose fluid circulation could be obstructed and freed.

The consequence is that a change in tension anywhere redistributes instead of staying local, which is why a wedge under an ilium can register at the base of the skull. The model treats the subluxation as a persistent distortion in how the body registers itself, locally stabilized and globally consequential. Read that way, a category names which part of the registration has failed. The dural and fluid layer in category one, the gravitational layer in category two, the disc and nerve root layer in category three.

What the model predicts about the Sacro-Occipital Technique

Two predictions follow, and both are the model’s own claims rather than established findings.

The first concerns the category. SOT stakes everything on the claim that the category is read before the correction and determines it. The model predicts that block placement specified in advance from a recorded category analysis will outperform placement chosen without one, with matched contact time. If a placement named in advance performed no better than any other, specificity as correspondence would be false.

The second concerns direction. An input that restores regulation should move a value toward the body’s own middle from whichever side it started. The same blocking brings a high reading down and a low reading up. Assemble two groups on one autonomic measure, one above its healthy range and one below, then give half of each a sham matched for position and contact time. The model predicts the blocked groups converge more than the sham groups. An input that shifts everyone the same direction is masking rather than restoring.

Who carries the Sacro-Occipital Technique forward

Two organizations descend directly from DeJarnette. SORSI, the Sacro Occipital Research Society International, carries the lineage. He founded the society in 1929 and made it international in 1957, and it holds the SOT Methods and SOT Craniopathy Methods marks and certifies practitioners from Idaho Falls, Idaho. SOTO-USA, based in Sparta, North Carolina, handles research and teaching. It certifies at two levels and runs an annual clinical symposium, with Charles Blum as research chair and Martin Rosen as co-author of its history and pediatric materials.

SOTO-USA gathered every published journal article on SOT and SOT cranial work up to the year 2000, more than 150 of them, into three volumes. Accredited chiropractic programs teach the technique as well. Life University runs a dedicated course covering DeJarnette’s history, the full categorization workup, and lab competency in each category, long taught by Jerry Hochman. In one survey of graduating chiropractic students, 63 percent had taken at least one SOT elective, placing it fourth among technique electives.

Lineage and influence of the Sacro-Occipital Technique

Upstream, SOT draws on three sources. Willard Carver gave DeJarnette the habit of describing the whole body in classified distortions rather than single bones, and DeJarnette named him as the one man he studied and admired in his early research years. Osteopathy gave him the sacroiliac lesion and the cranial concept he took from William Garner Sutherland’s work and rebuilt as SOT Craniopathy. He credited two chiropractors for solving his cerebrospinal fluid problem: James Drain of Texas, whose table arched the patient’s spine, and Leo Spear of Denver, who advocated the headward thrust.

Downstream, the padded wedge became standard chiropractic equipment far beyond the practitioners who run the full category system. Australian survey data covering 1,830 chiropractors shows pelvic blocking and SOT used more often in rural and remote practice than in urban practice. CMRT seeded a family of viscerosomatic reflex methods. The heel tension test DeJarnette introduced as a read on dural tension now appears in several unrelated methods.

How this page relates to the rest of the library

Sacro-Occipital Technique touches this library at both ends of the spine, and each connection is specific.

The Unified Model of Tone supplies the reading that makes a wedge an informational input rather than a weak push. The Architecture That Makes Tone Possible explains why tension applied at an ilium redistributes to the skull. The Sacroiliac Joint covers the anatomy the category system divides front from back. The Spinal Cord describes the tissue the dural sleeve suspends and tensions. Respiration and the Viscera teaches the breathing cycle that powers every block. Logan Basic reaches the same sacrum through a sustained light contact at its apex and is SOT’s closest relative here. H.I.O. Knee Chest works the other end of the same dural sleeve and holds the opposite view of where the lynchpin sits. Bio-Geometric Integration shares the tension-network reasoning and arrives at it through geometry instead of fluid. Webster Technique applies pelvic balancing to pregnancy, where the ligamentous tension SOT categorizes carries the most consequence. Blair Upper Cervical analyzes the occiput and atlas that category one work also targets, using imaging instead of palpated fibers. The full index of 33 techniques places SOT among the low force systems.