Pierce-Stillwagon

Pierce-Stillwagon is a full-spine chiropractic system that reads the spine while it is moving and then proves the correction with instruments. Walter Vernon “Vern” Pierce and Glenn Stillwagon began building it in 1963 in western Pennsylvania. Its signature procedure is videofluoroscopy, a low-dose motion x-ray that films the spine through flexion and extension so the doctor can watch which segment stops. A drop table delivers the correction. A paraspinal thermographic scan taken before and after reports whether the nervous system answered.

Pierce-Stillwagon started in 1963 with an instrument built to check the adjustment

Walter Vernon Pierce graduated from Palmer College in 1955 and opened a practice in Dravosburg, Pennsylvania, a borough of roughly 3,400 people south of Pittsburgh. He had spent the early 1950s as a United States Navy corpsman at Guantanamo Bay, Cuba. Alongside emergency duties he worked in the autopsy area, and his son Dr. Vernon Pierce Jr. credited that work with teaching his father the interior of the body (Today’s Chiropractic, 2004).

Pierce gave the dates himself in a 1986 television interview. In 1959 he worked out a new way of correcting the pelvis. In 1963 he and Glenn Stillwagon built the instrument that told them how often an adjustment had not done what they were taught it would. Everything Pierce-Stillwagon later added answers the question that 1963 device asked.

The sick child who sent Pierce below the atlas

Pierce left Palmer practicing upper cervical toggle-recoil work exclusively. He later added Logan Basic from a seminar. His son described the case that broke the exclusivity. A very sick young boy came in. Pierce adjusted the atlas, then the axis, and the child stayed sick. Out of options he tried the Logan Basic contact at the sacrum, and the boy settled.

Pierce stopped treating the top two vertebrae as the whole of the analysis. He started looking for a way to know in advance which level to take. Glenn Stillwagon, born May 23, 1925, had opened his own office in Monongahela in 1956 and would practice in the Mon Valley for 43 years. He brought the instrumentation. Pierce brought the imaging and the analysis rules.

Clarence Reaver named the fifth cervical key before Pierce-Stillwagon adopted it

The C5 emphasis reached Pierce-Stillwagon from Dr. Clarence E. Reaver, who ran the Reaver School of Chiropractic in Ohio and published 5th Cervical Key through Chirp in 1977, a 56-page volume. Reaver’s method applied the Palmer toggle-recoil thrust to the fifth cervical vertebra rather than to the atlas and axis, and he held that the correction held longer there.

The anatomy that makes C5 the weak point of the cervical column

The Pierce teaching material states the anatomical case for the fifth cervical directly. C5 sits at the transition between the mobile upper neck and the lower neck, where C6, C7, and T1 are held relatively still by their relationship to the rib cage. It carries fewer muscular attachments than its neighbors. On a lateral film its body is the narrowest in the cervical column and its laminae are the thinnest. Its inferior articular facets sit in a plane that blocks the vertebra from sliding forward or backward when the head travels.

Reaver and Pierce built a lynchpin claim on that anatomy. A force running down the axial line of the spine finds its weak point at the fifth cervical. The vertebra that yields first is the primary. Correct a primary and the secondary levels realign on their own. Correct a secondary and the primary does not move. That is a doctrine about where leverage lives, and Pierce practiced it before he could test it.

Then he tested it. Pierce observed that in a patient whose cervical curve had reversed completely, a C5 adjustment produced immediate change in some people and much less in others. His son’s account of what happened next is the intellectual turn of the whole system. Pierce started studying the spine in motion, and he found that C5 is not always the level. Sometimes it is C4. Sometimes C6. Sometimes something else in the neck entirely.

Videofluoroscopy films the spine through its range so Pierce-Stillwagon can see which segment stops

A still lateral film reports position. It cannot report whether a joint moves, because a segment can sit in a textbook position and still refuse to travel through its range. Pierce went after the second question and answered it by filming. He developed a motion study gathering a set of 40 views so the doctor could watch the spine move. Pierce said in 1986 that Continental X-Ray of Chicago had built the machine two years earlier for his We Care clinic and research center. Pierce Results teaching holds that he was the first to demonstrate a chiropractic adjustment on video x-ray.

Radiation is the reason the study is practical. Pierce described the machine as delivering roughly one-eightieth of the exposure of a conventional film, about one milliampere-second where a standard cervical exposure of the era ran 40 to 80. A motor carried the imaging head from the pelvis up to the skull. Automatic brightness control adjusted exposure to the patient’s thickness as the carriage traveled.

Two lines instead of one locate the fixed segment in flexion

Three things should happen when the neck flexes. The facets slide upward and forward, which opens the intervertebral foramina wider. The spinous processes fan apart. Pierce reduced the reading to a single test. In flexion every vertebral body should sit on one curved line. If two lines are needed to connect them, the subluxation lives in the straightened section. The fixed segment is typically the one directly below the intersection, confirmed by foramen size and by facet and spinous motion.

Extension inverts the picture. Facets slide back and down. The foramina close and the spinous processes converge. A segment that stays flexed while its neighbors extend is showing paradoxic motion, which Pierce-Stillwagon reads as a sign of abnormal cervical function. Rotation and lateral bending are read for coupled motion, described in White and Panjabi’s Clinical Biomechanics of the Spine. In the neck the spinous processes must rotate opposite the face, and loss of that coupling marks the level.

Why the segment below the failure is the one adjusted

When C7 fails to extend on T1, Pierce-Stillwagon adjusts T1, the subadjacent segment. That is the rule that most surprises practitioners from other systems, and the reasoning is mechanical. The fixation sits at the facets on the bottom of the vertebra that will not move. Driving the lower vertebra posterior to anterior, forward and up, breaks that fixation and lets the upper one travel. The upper vertebra cannot be pushed back and down from the front, so the leverage has to come from below.

Pierce-Stillwagon scores the neck against an arc it builds for each patient

In Pierce-Stillwagon the cervical lordosis runs from C1 to T2 and should describe an arc of 17 to 24 centimeters of radius, scaled to the patient’s height. The doctor marks the posterior inferior corner of the anterior arch of C1 and the anterior superior corner of the T2 body. A compass set to that chord swings arcs back from both marks. Their intersection becomes the radius point for that person’s own curve. An AcuArc ruler does the same job in seconds.

Two more measurements finish the reading. The atlas plane line should sit 18 to 24 degrees above the bottom border of the film. Whitehorn’s line, drawn under the body of C2, should run parallel to the floor. Every vertebral body should stay on George’s line, the continuous curve along the posterior vertebral bodies, with even spacing between the spinous processes.

The pelvis is read on the same film logic

On the anterior-posterior view Pierce-Stillwagon requires the femur heads, the sacral base, and the iliac crests to sit level. Pierce reworked the pelvic reading he had been taught, finding it limited. A line perpendicular to the femur head line, passing through the second sacral tubercle, should bisect the symphysis pubis. The sacrum should float roughly 1 to 1.5 inches above the symphysis in a heart-shaped pelvic opening, with the obturators almond-shaped and matched. On the lateral view the lumbar bodies should sit on an arc of 22 to 30 centimeters of radius.

From that the doctor names the listing. A posterior-inferior ilium shows a short leg on that side, a narrowed ilium, a taller and wider obturator, and a lower ischial tuberosity. The sacral posteriority on the major side is corrected first, then the ilium on the short-leg side. Anterior-superior and internal-external patterns each carry their own film signature and their own order of correction.

The thermographic instrument in Pierce-Stillwagon reads the autonomic nervous system

Paraspinal thermography carries the second half of the Pierce-Stillwagon analysis, and what it measures is sympathetic outflow at the skin. The instrument reads infrared emitted beside the spine without touching the patient. Skin temperature at that depth is set by blood flow through the cutaneous capillaries, and cutaneous vessel caliber is set by sympathetic vasomotor outflow. The reading is a nervous system reading taken through the circulation.

Pierce and Stillwagon built the hardware. W. Glenn Stillwagon and Kevin L. Stillwagon filed for United States patent 4,849,885 on February 16, 1984. It issued on July 18, 1989 as “Thermograph with Computer Display.” The claims cover a hand-held scanner carriage of spaced infrared sensors feeding digitized readings to a computer. The Visi-Therm system came out of that work, and the DT-25 became the standard instrument in Pierce practices. The Tytron C-3000, a dual-probe digital instrument made by Titronics Research and Development of Oxford, Iowa, is the modern equivalent in wide use.

The scan reports a head-to-tail gradient and a side-to-side match

The scan runs from the sacrum to the occipital shelf and produces a graph resembling a cardiogram. The first reading is the head-to-tail gradient. The occiput should sit about one degree Celsius warmer than the low back, and the trace should warm smoothly on the way up. The second reading is side to side. Matched regions share a blood supply, so paired temperatures should be near identical.

The threshold Pierce-Stillwagon works to comes from outside chiropractic. Sumio Uematsu and colleagues measured thermal asymmetry across 40 matched body regions in 90 asymptomatic people, repeating the measurements over five years. Differences ran on the order of 0.18 to 0.38 degrees Celsius. The authors proposed those values as a standard for assessing sympathetic nerve function (J Neurosurg 1988;69:552-555). A side-to-side variance above 0.3 degrees Celsius is the figure Pierce-Stillwagon treats as significant. The interpretation has been studied too. Seventeen chiropractors independently read 17 scan pairings from the Tytron C-3000, and agreement on the full-pattern category reached a kappa of 0.73 (J Can Chiropr Assoc 2015).

A Pierce-Stillwagon adjustment is a drop-table thrust that gets rescanned

The table is the Zenith VertiLift Pierce, a variable-height hylo carrying a Pierce 3-D headpiece with auto-cocking dorsal and pelvic drops. It is a full-drop table, so the cervical and pelvic sections drop as well as the thoracic. Pierce-Stillwagon uses all three. Pierce took the mechanism from J. Clay Thompson, whose Thompson Terminal Point work he studied at Palmer, and applied it across the whole column.

The thrust is short, the drop absorbs the recoil, and nothing rotates

The doctor cocks the table section under the target, sets a pisiform or thumb contact over the indicated segment, and thrusts along the vector the films specified. The cocked section releases and falls a fraction of an inch. That drop absorbs the recoil and carries the force into the joint, which is why a light hand can move a fixated segment.

The delivery is low force and high velocity. There is no rotation of the neck and no long-lever twisting of the trunk, and cavitation is neither the goal nor the marker. The patient feels a firm, brief pressure and hears the table. Instrument delivery is an equal option. The Variable Frequency Adjuster lets the doctor set force, pre-load, impact count, and delivery frequency across a range of 4 to 16 hertz.

The instrument stops when the segment’s resistance changes

The computerized adjuster carries a force transducer in its head. In analysis mode it applies a run of taps at increasing speed and reads the segment’s compliance, recording the frequency at which that vertebra moved most freely. When the doctor switches to adjusting, the instrument works at the recorded frequency. It stops the moment the transducer registers a change in the segment’s resistance.

The paraspinal scan closes the loop. The patient is scanned before the adjustment and again after, and the pattern is compared. Pierce’s rule was that the finding governs the visit, including the decision not to adjust. Dr. Robert Keeler, who worked alongside him for more than 10 years, put the founder’s position plainly: “He was adamant that he did not have a technique, he had a system.”

Where Pierce-Stillwagon meets the Unified Model of Tone

Pierce built a system that finds where the spine lost motion and proves the finding twice, once on film and once on an autonomic instrument. The Unified Model of Tone is a claim about what those two instruments point at. The correspondences run close here, because Pierce reached several of the model’s positions from the x-ray suite rather than from theory.

A spine that stops moving stops telling the brain where it is

Movement is the primary means by which the body knows itself, and the Unified Model of Tone holds that this is the whole reason a motion study finds what a still film cannot. A joint carried through its range rocks each segment through small arcs. That motion fires the proprioceptors seated in muscle, capsule, and ligament. The afferent picture they generate is what the brain reads against its own predictions. The body cannot build an accurate model of where it is by holding still. It moves to sample itself, and each movement updates the map the next one is planned from.

A segment that will not travel through flexion has stopped reporting. The brain keeps planning movement from a map that no longer receives data from that level. Pierce-Stillwagon’s 40-view study records the sampling process itself, which is why the loss appears there and not on a still film. Pierce chose the imaging that matches the physiology, and he chose it in the 1980s on mechanical reasoning alone.

A structure can be imaged in fine detail while the pattern it holds stays invisible

The neutral lateral film in Pierce-Stillwagon resolves a vertebral body to a fraction of a centimeter and still cannot say whether that vertebra travels. Specificity lives in the reading rather than in the hands, because an input can only correspond to a pattern that has first been found.

Pierce-Stillwagon builds that limit into its workflow. The neutral lateral gives the structure, scored against a 17 to 24 centimeter arc. The motion study gives the pattern. Neither replaces the other, and the method requires both before a thrust is delivered. That is a triangulation discipline, and it separates Pierce-Stillwagon from analyses that resolve anatomy more finely without asking what the anatomy is doing.

Sympathetic drive from the brainstem sets the skin temperature the scan reads

Autonomic regulation is the clinical readout of coupling across the body, and the Unified Model of Tone holds that the state read at one site is the state of the whole. Paraspinal skin temperature is a vasomotor measure. Vasomotor tone is generated by sympathetic drive from the rostral ventrolateral medulla down through the spinal preganglionic neurons.

So the Pierce-Stillwagon scan reads brainstem-set sympathetic outflow at the skin. The model reads a smooth, symmetric, sacrum-to-occiput trace as a body whose coupling is intact, and reads the asymmetry Pierce-Stillwagon flags past 0.3 degrees Celsius as a region where the local state has decoupled from the whole. Stillwagon put a graph of that variable in the doctor’s hand by the late 1980s, and the variable was the autonomic nervous system.

The fifth cervical key, and why the model holds there is no lynchpin

Reaver and Pierce held that the fifth cervical is a key. It is a transitional vertebra with thin laminae, few muscular attachments, and a lower neck braced by the ribs, so axial force finds it first. Correcting the primary realigns the secondaries, and correcting a secondary moves nothing. That is their claim, and Reaver was teaching it in Ohio before Pierce carried it into a motion study.

The Unified Model of Tone holds that there is rarely a single lynchpin. A body ordinarily holds several points of critical tension at once, each with a different potential to reorganize the whole, and that potential shifts with the body’s state from one week to the next. Leverage is real, leverage is plural, and it moves. That is our position.

The reading that holds both is the one Pierce arrived at himself. He kept the C5 key and then filmed the neck in motion, and he found C5 is not always the level. Sometimes C4, sometimes C6, sometimes elsewhere. A model with one governing bone cannot explain why an atlas contact, a sacral contact, and a fifth cervical contact each register across the whole system. A model of plural, moving leverage explains all three, and it explains why Pierce needed a motion study to find which one was live today.

Two predictions the model makes from Pierce-Stillwagon’s own instruments

Two claims in Pierce-Stillwagon sit ahead of the measurement, and the Unified Model of Tone states them as its own predictions rather than as established physiology.

The first concerns the thermographic pattern. The model predicts bidirectional return. A matched input should move a paraspinal region reading too warm and one reading too cool toward the same midline. The spread across a group narrows rather than shifting every scan one direction. Pierce-Stillwagon already scans before and after each visit against a 0.3 degree threshold, so the instrument to run it has sat in these offices for four decades.

The second concerns the recorded frequency. Oscillation is the carrier of tone, and the Pierce-Stillwagon adjuster already stores the frequency, between 4 and 16 hertz, at which each segment moved most freely. The model predicts that this per-segment frequency reads tone through its carrier rather than reporting a property of the bone, and that it will shift after a correction delivered at another level entirely.

Who carries Pierce-Stillwagon forward

Pierce died on December 20, 1993, closing a career that began at Palmer in 1955, and the work is now taught as the Pierce Results System. Glenn Stillwagon continued in Monongahela, ran Stillwagon Seminars and Visi-Therm, and died on July 16, 2006. The reference documentation compiled at Chiro.org records the analysis as Pierce was practicing it at the end.

Training runs through beginner and advanced seminars, historically at Palmer College in Davenport and at Life University. A 4-day intensive is the stated minimum before a doctor works the system, and seminars review each attendee’s own motion studies. Pierce Results Plus is a separate teaching body led by Dr. Kenneth L. Guzik of Ellettsville, Indiana, who holds a 1991 videofluoroscopy certification from Palmer. Chirp, the publisher of Reaver’s 1977 book, still supplies the tables and thermographic instruments.

Four streams feed Pierce-Stillwagon, and Pierce added two of his own

The upper cervical toggle-recoil work came from Palmer, the drop mechanism from Thompson, the sacral contact from Logan Basic, and the fifth cervical from Reaver. Pierce added the thermographic pattern analysis with Stillwagon and the reading of the spine in motion. Practitioners commonly pair it with an upper cervical method, taking the atlas and axis one way and everything below with Pierce-Stillwagon.

How this page relates to the rest of the library

Thompson Terminal Point supplied the drop mechanism the Pierce table is built on, and Pierce studied under Thompson at Palmer before deciding the x-ray analysis needed to go further. Gonstead is the other imaging-led full-spine analysis in this library. Gonstead resolves the static film and the disc with great care. Pierce-Stillwagon spends its precision on the film in motion. Logan Basic gave Pierce the sacral contact that settled the child his upper cervical work could not reach.

Among the upper cervical methods, H.I.O. Knee Chest is where Pierce started and what he moved past, and NUCCA and Atlas Orthogonal hold the atlas position that the fifth cervical key argues with. Toftness is the library’s other instrument-led detection method, reading a different emitted signal from the same paraspinal skin. Chiropractic Biophysics shares the measured-curve premise and scores the same cervical arc by a different geometry.

For the physiology underneath, movement covers why a joint that stops traveling stops reporting. Muscle spindles and proprioception describes the receptors a motion study images indirectly. The autonomic nervous system is the outflow a Pierce-Stillwagon thermographic scan measures. The Pierce and Stillwagon profile carries the men rather than the method, and the index of 33 techniques places this one among the instrumented full-spine systems.