Webster Technique

The Webster Technique is a specific sacral analysis and a diversified chiropractic adjustment, joined in the female patient by a soft tissue contact on the round ligament of the uterus. Every part of it lands on the mother’s pelvis. Larry Webster taught the sacral analysis and adjustment for all weight bearing people, pregnant or not, female or male, adult or child, and the organization he founded certifies it on those terms. The pelvis is the subject. The sacrum is the contact.

The organization that certifies the Webster Technique defines it without reference to fetal position

Jeanne Ohm and Joel Alcantara published the governing definition in the Journal of Pediatric, Maternal & Family Health on May 10, 2012, on behalf of the International Chiropractic Pediatric Association. It reads: “The Webster technique is a specific chiropractic analysis and diversified adjustment. The goal of the adjustment is to reduce the effects of subluxation and/or SI joint dysfunction. In so doing neuro-biomechanical function in the sacral/pelvic region is improved.” That is the whole definition. It names an analysis, an adjustment, a joint, and a region. It stops there.

The ICPA definition carries a scope statement alongside it. The Webster Technique is a valid sacral analysis and adjustment for any weight bearing person. Webster taught it that way while he was an instructor at Life Chiropractic College, and the certification class has taught it that way since its first cohort in 1999. Pregnancy is the most common reason to use it and the widest setting it is taught in.

Why the ICPA retired the words “breech” and “in-utero constraint”

Both phrases were once attached to the Webster Technique in print. Peet’s Chiropractic Pediatric and Prenatal Reference Manual, second edition of 1992, described it as a breech turning technique. Anrig and Forrester described it in the 1990s as an in-utero constraint technique. In 1999 Connie Webster, then ICPA executive director, and Jeanne Ohm launched the ICPA Webster Technique Proficiency Certification class. Within a year both terms were gone from the organization’s language, and the method was called the Webster Technique and nothing else.

The ICPA gave a specific reason for the change, and it is a reason about scope rather than about results. Both retired terms named a condition in the unborn child. A technique named for that condition describes itself as care directed at the fetus, which is obstetrics. The Webster Technique is directed at sacral subluxation in the mother. The ICPA also declines to endorse Leopold’s maneuver as part of the Webster protocol, for the same reason: palpating to determine fetal lie is an obstetric assessment, and it is not in the procedure.

Larry Webster built the Webster Technique around the sacrum and founded the ICPA to defend it

Larry Webster graduated from Logan College of Chiropractic in 1959 and later served as clinic director and pediatrics instructor at Life Chiropractic College in Marietta, Georgia. His first published account, “Chiropractic care during pregnancy,” appeared in Today’s Chiropractic in 1982, and the ICPA dates the technique’s development to that decade. Logan practitioners and his own students describe the same emphasis. Webster held the correction of the sacral subluxation to be the center of the work. The technique he named is a sacral technique before it is anything else.

In 1986 he founded the International Chiropractic Pediatric Association. The prompt was a proposed Connecticut law that would have restricted chiropractic care for any child under 12 years of age. Webster built an organization to train, certify, and defend chiropractors caring for children and pregnant women. He died in 1997, two years before the certification program in his own technique enrolled its first class. The ICPA has grown from roughly 500 members in 2000 to several thousand worldwide, and it remains the oldest free standing body in the profession teaching and certifying the technique.

The Webster analysis is a prone heel to buttock check that names one side of the sacrum

Analysis comes first in the Webster Technique, and it takes under a minute. The ICPA’s 2012 definitional paper specifies prone for both the analysis and the adjustment. That assumes a table with drop pieces and a pregnancy pillow. The pillow supports both anterior superior iliac spines evenly, so body weight distributes across the table. Side posture is the alternative, reserved for a patient who cannot lie face down.

The chiropractor flexes both knees and brings each heel toward the same side buttock. One side resists. One heel does not approximate its buttock to the same depth as the other. That asymmetry, not a leg length reading taken with the legs straight, is what the Webster analysis calls sacral posteriority, and it names the side. The pregnancy pillow matters to the finding as well as to comfort, because a belly that is unevenly supported tilts the pelvis and corrupts the check.

The Webster Technique repeats the same maneuver immediately after the adjustment. Equal resistance on the two sides is the ICPA’s stated post-check. Two checks bracket one adjustment, and the second check is the one that reports symmetry.

The Webster adjustment is a low force posterior to anterior contact on the sacral notch

The chiropractor stands ipsilateral to the involved side, the side that showed heel to buttock resistance in the Webster analysis. Webster named a low force drop technique as the preferred mode. The contact point is the sacral notch, where the sacrum narrows just lateral and inferior to the second sacral tubercle. The thrust vector is posterior to anterior, straight through that contact. It is one impulse, shallow and specific. The ICPA’s own definition names the Webster Technique adjustment a diversified adjustment.

The drop piece supplies the amplitude the hand does not

The drop mechanism is the reason the force stays low. The drop piece is cocked to hold the patient’s body weight plus the weight of the doctor’s hand, then releases through a fraction of an inch as the thrust lands. The table absorbs the amplitude so the hand does not have to supply it, which is what makes a shallow contact adequate on a pelvis loaded by a third trimester. The mechanism is the same one taught in Thompson Terminal Drop Point. Pregnancy pillows carry a recess for the abdomen and a ridge below the chest, so the patient’s spine stays straight and no rotation is introduced through the lower back.

An instrument variant exists in the published record. Rubin reported in 2010 on the use of an adjusting instrument to deliver the Webster sacral contact in three women under care, the approach taught on the Activator Method page. The contact point and the vector hold; only the delivery of force changes.

The round ligament contact is the second component of the Webster Technique

The patient turns supine for the second component, and the chiropractor works on the side opposite the sacral posteriority. The landmarks are geometric. One line runs from the umbilicus at roughly 45 degrees inferior and lateral. A second line runs from the anterior superior iliac spine at roughly 45 degrees inferior and medial, and on a larger abdomen that second line is redrawn from the ASIS running superior and medial instead. Where the two lines cross sits over the round ligament near its junction with the inguinal ligament. That crossing point is the contact.

The chiropractor palpates there for tension, takes a thumb contact, and applies inferior to superior pressure. The hold typically runs 1 to 3 minutes while the thumb turns through roughly 5 degrees, clockwise or counterclockwise, and it ends on a palpable release. The pressure stays sustained and light. It is a soft tissue hold, and nothing about it contacts the fetus.

Webster’s stated rationale for the contact is a chain of tension. As the sacrum rotates, the uterosacral ligament on that side stretches. That stretch loads the uterus asymmetrically. The rotational tension then pulls unilaterally on the round ligament of the opposite side. Webster taught that releasing the loaded round ligament supports the efficiency of the sacral adjustment rather than substituting for it. The two components are one procedure.

What the round ligament actually is

The tissue the Webster contact reaches is a fibromuscular cord roughly 10 to 12 cm long. It attaches at the cornu of the uterus, just anterior and inferior to the uterotubal junction. From there it crosses the pelvis and passes through the deep inguinal ring and the inguinal canal. It ends in the labia majora, with fibers blending into the mons pubis, as described in StatPearls. The Sampson artery, a branch of the uterine artery, runs its length. It derives from the gubernaculum, and the male homologue of the round ligament is the gubernaculum testis. It holds the uterus anteverted, and it is one of the few uterine supports a hand can reach from outside the body.

Its neighbors complete the suspension the Webster analysis reasons about. The broad ligament is a double fold of peritoneum that drapes from the uterus to the lateral pelvic walls and carries the round ligament within it. The uterosacral ligaments run backward from the cervix to the sacrum, which is the anatomical link Webster’s rationale depends on. The sacrotuberous ligament runs from the sacrum and posterior ilium to the ischial tuberosity, and it is treated in full on the Logan Basic page. Beneath all of it, the pelvic floor slings from pubis to coccyx and forms the lower boundary of the space.

What a Webster adjustment is like, and why it suits a pregnant body

Both contacts are graded to the body receiving them. The sacral correction is delivered low and specific, most often on a table with a drop mechanism, so the amplitude comes from the piece rather than from force driven through the trunk. Nothing is directed into the abdomen. There is no rotation of the trunk and no cavitation near the uterus. What a patient registers is a brief settling at the base of the spine.

The round ligament contact is lighter still. The practitioner locates the band of tension near the inguinal ligament and rests a sustained inferior to superior pressure on it for one to three minutes. The load is closer to the weight a closed eyelid can carry than to anything resembling a thrust. Because the contact is held rather than delivered, there is no moment of force to brace against, and the tissue releases on its own schedule.

This is why the work is used across a pregnancy rather than saved for its final weeks. The drop mechanism and the sustained ligament hold both scale down cleanly, and the practitioner rechecks the sacrum and the round ligaments at each visit, adjusting only what the analysis names that day.

Pelvic dimensions change during pregnancy by measurable millimeters and centimeters

Relaxin rises in pregnancy, peaks in the first trimester and again around delivery, and softens the pelvic ligaments and the cartilage of the pubic symphysis. The joint gap widens with it. StatPearls records the symphysis widening from about 4 mm at 8 weeks of gestation to about 7 mm at term, with separation past 1 cm postpartum considered pathological. The joints the Webster Technique assesses are joints that move, and during pregnancy they move more.

Position changes the internal dimensions by centimeters, which is the physical premise the Webster analysis works from. Reitter and colleagues scanned 50 pregnant and 50 nonpregnant women by MRI pelvimetry, comparing a dorsal supine position with a kneeling squat, in the American Journal of Obstetrics and Gynecology in 2014. Average transverse diameters ran 0.9 to 1.9 cm wider in the kneeling squat, a gain of 7% to 15%. In the pregnant group the bispinous diameter measured 12.6 cm supine against 14.5 cm in the squat.

Asymmetry, specifically, tracks with symptoms. Damen and colleagues measured sacroiliac joint laxity by Doppler imaging of vibrations in 163 women at 36 weeks of gestation, reported in Acta Obstetricia et Gynecologica Scandinavica in 2001. Among the 73 women with moderate to severe pelvic pain, 37% showed asymmetric sacroiliac laxity, against 4% of the 90 women with no or mild pain. The mean left to right difference was 2.2 threshold units against 0.9. The separating variable was the side to side difference, which is the same variable the heel to buttock check is built to detect.

Where the Webster Technique meets the Unified Model of Tone

The ICPA holds a neurobiomechanical account of sacral subluxation and its consequences for pelvic function. The Unified Model of Tone is ours, and it reads the same pelvis as a tension network whose state is one variable. Webster described what his hands found, and he described it accurately. The correspondences that follow are the model’s reading of the same anatomy.

The pelvis holds the fetal environment as a tension network

The pelvis the Webster Technique adjusts has no rigid housing for the uterus. Its shape and its internal space are set by the tensional state of the structures around it. Those structures are the sacroiliac joints, the pubic symphysis, the round and broad ligaments, and the soft tissue running from pelvis to diaphragm. The Unified Model of Tone reads that arrangement as biotensegrity, a structure in which compression elements float within a continuous tension field and no element is loaded independently. Reitter’s 2014 centimeters are what a tensegrity structure does. Change the configuration of the joints and the enclosed volume changes with it, without a single bone being remodeled.

Sacral posteriority is a reading of asymmetric tone

The heel to buttock check measures how much resistance the tissue on each side offers to the same imposed movement, and it reports the difference between the two sides. The model reads that difference as tone asymmetry across the two halves of the pelvis. Damen’s 2001 finding sits alongside it, where the variable separating painful from comfortable pregnancies at 36 weeks was the left to right difference. The Webster analysis is an asymmetry instrument, and asymmetry is what the model wants measured.

The bony adjustment and the ligament contact are one input

Webster paired a sacral thrust with a sustained abdominal hold and taught that the second supports the first. The model reads the sacrum and the round ligament as two sites on one continuous tension field. A posterior to anterior impulse at the sacral notch and a 1 to 3 minute inferior to superior hold at the inguinal end of the round ligament reach the same variable from two directions. This is also why the same technique is taught for a person who is not pregnant. The pelvis is the doorway, and the tension network is what is on the other side of it.

The model’s prediction about intrauterine constraint, and the test that would settle it

Intrauterine constraint is a recognized contributor to fetal deformation and to malpresentations including breech, described in the review by Moh and colleagues in Journal of Pregnancy in 2012. The Unified Model of Tone holds that when pelvic tension is asymmetric, the uterus takes an asymmetric shape and the available space contracts in predictable directions. From that the model draws a prediction, stated here as the model’s own claim and not as established physiology.

The prediction: reducing asymmetric pelvic tension expands the space available to the fetus. A fetus will often reposition when that space opens, because the tensegrity structure around it has changed and now permits a different configuration. The prediction is a claim about space and about mechanism.

The model names its own test. Measure pelvic tension asymmetry before and after an intervention that targets it. Blind the assessor to fetal position. Treat the change in asymmetry as the mediator rather than the outcome. If position changes while asymmetry does not, the mechanism proposed here is wrong. Damen’s Doppler protocol measured side to side sacroiliac laxity in 163 women at term, so the instrument for the mediator already exists. The Unified Model of Tone claims the mechanism, and the mediator is measurable today.

ICPA certification in the Webster Technique is a 13-hour course with a three-part examination

The Webster Technique Certification runs 13 hours, delivered as a weekend seminar from Saturday morning through Sunday midday, with an on demand online option for international members and members outside the contiguous United States. It sits inside the broader ICPA 180-hour certification program. ICPA membership is required to register, and continued membership is required to keep the certification current.

The practical examination is taken on site, the written examination is completed online afterward, and a principles and practice agreement accompanies both. All three must be passed. Student members may attend the seminar and take the practical, then upgrade from student to DC membership after graduation before sitting the written exam. A chiropractor who has not completed all three parts and does not hold current ICPA membership is not Webster certified, whatever else that chiropractor may know about adjusting a sacrum.

The ICPA gathers Webster Technique data from working practices through a research network

Alcantara, Ohm, and Kunz published a practice-based research network study of the Webster Technique in January 2012. It drew a sample of 81 pregnant women under chiropractic care, with a mean age of 32.4 years. The design collected sociodemographic data, prior prenatal care, and fetal position. The sample included women who had previously used external cephalic version, acupuncture, moxibustion, homeopathy, and slant board work. Two further network protocols had passed ethics review by the time the 2012 definitional paper appeared.

Case documents carry the rest of the record. Alcantara and colleagues published a five patient case series in December 2011. Falk and Stinson published a single patient Webster Technique case study in the Journal of Pediatric, Maternal & Family Health on June 8, 2017. It describes a 26-year-old in the 27th week of a second pregnancy who received 29 adjustments, with imaging at two time points. Pistolese surveyed ICPA practitioners for the Journal of Manipulative and Physiological Therapeutics in 2002. Read as a body, these documents record one thing consistently: what practitioners analyzed and what they adjusted was the mother’s sacrum and pelvis.

How this page relates to the rest of the library

• Logan Basic is Webster’s own lineage, and it takes the sacrotuberous ligament as its primary contact. That ligament is one of the pelvic tension elements the Webster heel to buttock check reads indirectly, which is why the two methods share a sacrum and differ on the hand.
• Diversified is the adjustment named inside the ICPA definition. The Webster sacral thrust is a specific, low force diversified contact, and the analysis that selects the side is what makes it Webster rather than a generic sacral correction.
• Thompson Terminal Drop Point supplies the mechanism Webster preferred. The drop piece cocked to body weight plus the doctor’s hand is what keeps a third trimester sacral adjustment shallow.
• Activator Method covers the instrument route documented for the Webster sacral contact in 2010, where the vector and the landmark hold and only the force delivery changes.
• Pediatrics is where the ICPA’s wider curriculum sits, the 180-hour program that the 13-hour Webster certification is one component of.
• The Unified Model of Tone holds the biotensegrity account behind this page, including the intrauterine constraint prediction and the blinded mediator test that would settle it.