Comparing Chiropractic Techniques: A Guide to Common Approaches

Five chiropractic techniques account for the vast majority of treatments delivered in New Zealand, yet most patients could not name more than one. Diversified, Gonstead, Activator, Thompson Drop, and flexion-distraction each take a different physical approach to the same underlying goal — restoring joint function and reducing pain. The differences are not trivial, and understanding them puts a patient in a considerably stronger position when sitting across from a practitioner for the first time.

What the Techniques Actually Are

Diversified Technique and the Gonstead Approach

Most chiropractic adjustments in New Zealand fall under the Diversified technique, even when the practitioner does not use that label. It is the generalist method taught as foundational curriculum at the New Zealand College of Chiropractic and at most international programmes. The chiropractor identifies a restricted joint, positions the patient, and delivers a quick, controlled thrust — what clinicians call a high-velocity, low-amplitude (HVLA) adjustment. The audible pop that often accompanies it is simply gas releasing from the joint capsule, not bone moving against bone. Diversified adjustments can be applied across the full spine and pelvis, and the technique is broad enough to encompass a wide range of hand positions and patient postures.

The Gonstead approach narrows that scope considerably. Developed by an American chiropractor in the mid-twentieth century, it uses a detailed analysis system — including specific X-ray interpretation, skin temperature readings, and careful palpation — to identify the precise vertebral segment to adjust. The patient is typically seated or positioned side-lying on a flat bench rather than a multi-drop table. Where Diversified casts a wider net, Gonstead practitioners argue that specificity is the point: one segment, one contact, one correction. For the patient, the physical experience is similar — a manual thrust with an audible release — but the assessment process leading to that moment is distinctly more involved.

Instrument-Assisted and Low-Force Methods

Not all chiropractic adjustments involve a manual thrust. The Activator Method uses a small, spring-loaded instrument about the size of a ballpoint pen to deliver a precise mechanical impulse to a targeted joint. The force is considerably lighter than a manual adjustment, and the speed is faster than the human hand can achieve — the impulse is delivered and finished before the surrounding muscles can tense in response. There is no twisting, no audible pop, and most patients describe the sensation as a firm tap.

The Thompson Drop technique sits somewhere between manual and instrument-assisted methods. The treatment table is fitted with sections that can be cocked upward by a few millimetres and then drop when the chiropractor applies a manual thrust. The dropping segment absorbs part of the force, meaning less pressure is required from the practitioner. The result is a gentler adjustment that still involves hands-on contact but with reduced force compared to a standard Diversified thrust.

Both approaches are commonly offered to patients who find manual adjustment uncomfortable, as well as to older adults, young children, and those recovering from injury. They are not watered-down alternatives — they are distinct tools with their own clinical rationale and application.

Why Different Chiropractors Use Different Methods

Training, Philosophy, and Clinical Judgement

A chiropractor who favours the Gonstead system and one who uses primarily Activator are not disagreeing about how the body works. They have made different clinical decisions about how best to intervene, informed by their training, their accumulated patient experience, and the conditions they encounter most often in practice.

New Zealand chiropractors complete a five-year degree at the New Zealand College of Chiropractic in Auckland, where they are exposed to multiple techniques. Graduates enter the profession competent in several approaches, but over years of practice most develop a primary method that forms the core of their clinical work. Some favour the tactile feedback of manual adjustment. Others find that instrument-assisted methods give them more control over force delivery. A number combine techniques within a single appointment — using Diversified for the thoracic spine, for instance, and Activator for the cervical region.

This variability is a feature of the profession, not a deficiency. The NZ Chiropractic Board requires registered practitioners to practise within their scope of competence and to apply clinical reasoning to each patient encounter. A chiropractor who uses only one technique for every presentation would raise more concerns than one who adapts their approach.

Matching the Technique to the Patient

The technique a chiropractor selects for a particular patient depends on factors that extend well beyond the practitioner’s personal preference. Age is relevant: a seven-year-old and a seventy-year-old presenting with the same complaint will rarely receive the same adjustment. Body type matters — joint laxity, muscle tone, and spinal curvature all influence which approach is appropriate and how much force is required.

The presenting condition itself is often the strongest determinant. Acute disc injuries generally call for gentler techniques or flexion-distraction rather than high-velocity thrust. Chronic mechanical low back pain, by contrast, often responds well to manual adjustment. Joint inflammation may rule out direct manipulation of the affected segment entirely, redirecting the chiropractor toward adjacent areas or instrument-assisted methods.

Patient comfort and preference also play a legitimate role. A patient who tenses involuntarily during a manual adjustment may respond better to an Activator approach, not because the adjustment is more effective in that case, but because a relaxed patient allows for a better clinical outcome. Good practitioners recognise this and adjust accordingly. The goal is not to impose a technique on the patient but to select the one that best serves the clinical situation — which includes the patient’s ability to receive the treatment comfortably.

What the Evidence Says

Research on Manual Adjustment Techniques

The research supporting spinal manipulation for low back pain is substantial enough that clinical guidelines in several countries, including New Zealand, include it as a recommended option. The difficulty lies in unpacking which specific technique deserves the credit. Most large-scale studies and systematic reviews — including the influential Cochrane reviews on spinal manipulation — group all manual thrust techniques together under the umbrella of HVLA manipulation. Diversified and Gonstead both deliver HVLA thrusts, and the evidence base does not, for the most part, distinguish between them.

This means that the case for Diversified as an evidence-supported technique is strong, but it is strong largely because it is the default technique in most clinical trials. Gonstead-specific research is thinner. A small number of dedicated studies have reported positive outcomes for low back pain and cervical conditions, but the volume and quality of this evidence does not match what exists for spinal manipulation as a general category. That is not a verdict against Gonstead — it reflects the practical difficulty of running randomised controlled trials that compare two techniques requiring different clinician skills and patient positioning.

What can be said with reasonable confidence is that HVLA spinal manipulation, however it is delivered, has a credible evidence base for short-term pain relief and functional improvement in non-specific low back pain. The evidence for neck pain and headache is present but less robust.

Evidence for Instrument and Table-Assisted Approaches

The Activator Method occupies an unusual position in chiropractic research. Its developers have invested significantly in building an evidence base, funding and publishing a series of randomised controlled trials. Some of these studies report outcomes comparable to manual adjustment for conditions like chronic low back pain. Others show more modest results. Independent reviews have been cautious, noting that much of the Activator research comes from a small group of investigators associated with the instrument’s development. The evidence is neither dismissible nor definitive — it is a body of work that supports the technique’s clinical use while acknowledging that more independent replication would strengthen the case.

Flexion-distraction has a more focused evidence profile. Research supports its use for disc herniation and radiculopathy, conditions where its gentle, non-thrust mechanism is particularly relevant. Studies have shown improvements in pain and disability measures, though sample sizes tend to be modest. The clinical logic is straightforward: the technique directly addresses disc-related pathology through sustained mechanical traction, and the outcomes research aligns with that mechanism.

Thompson Drop is the least studied of the major techniques. While practitioners report clinical success, the peer-reviewed evidence specific to the drop mechanism is sparse. This does not mean the technique is ineffective — it shares biomechanical principles with other HVLA methods — but patients or practitioners looking for dedicated research will find relatively little to draw on.

Flexion-Distraction and Specialised Approaches

How Flexion-Distraction Works

Flexion-distraction looks and feels quite different from the thrust-based techniques. The patient lies face down on a segmented table whose lower section can move in a slow, rhythmic arc — gently pulling the lumbar spine into flexion and then returning it to neutral. The chiropractor guides the movement with one hand while monitoring the target segment with the other. There is no sudden force, no pop, and the pace is deliberately unhurried. Most patients find it comfortable, and some find it relieving from the first session.

The technique was developed specifically for conditions involving the intervertebral discs. By creating a controlled, repetitive flexion movement, it aims to reduce intradiscal pressure, draw herniated material away from the nerve root, and restore motion to compressed spinal segments. This makes it a frequent choice for patients presenting with disc herniations, sciatica, and spinal stenosis — conditions where a high-velocity thrust might aggravate rather than relieve the problem.

In a New Zealand clinical setting, flexion-distraction is often used alongside other techniques rather than as a standalone approach. A chiropractor might use Diversified adjustment for the thoracic spine and flexion-distraction for a symptomatic lumbar disc in the same session. The technique requires a specialised table, which means not every clinic offers it — but among those that do, it is valued for the clinical options it opens up with patients who cannot tolerate conventional adjustment.

When a Specialist Technique Is Indicated

Certain clinical presentations steer the technique choice before the chiropractor’s personal preference enters the conversation. A patient with a confirmed lumbar disc herniation and radiating leg pain is a candidate for flexion-distraction or a cautious instrument-assisted approach, not for a forceful rotational manipulation of the affected segment. An elderly patient with advanced osteoporotic changes in the spine needs a low-force method — the clinical risk profile simply rules out high-amplitude thrust.

Pregnancy changes the equation in a different way. The growing abdomen and ligamentous laxity of late pregnancy make some positioning and techniques impractical. Chiropractors trained in the Webster technique — a specific pelvic adjustment approach — adapt their method to the pregnant patient’s anatomy. Post-surgical patients present yet another set of constraints: spinal fusion hardware, healing tissue, and altered biomechanics all demand careful technique selection.

The practical point for patients is that technique availability varies between practitioners and clinics. Not every chiropractor in New Zealand has a flexion-distraction table, and not every practitioner is trained in all instrument-assisted methods. If a patient’s condition suggests a specific technique might be appropriate, it is worth asking about that directly when making an appointment. The NZ Chiropractic Board‘s register of practitioners does not list technique specialisations, but most clinic websites do, and a phone call to the practice will clarify what is available.

Having the Conversation With Your Chiropractor

Questions Worth Asking

Asking about technique is not a challenge to the chiropractor’s competence — it is a reasonable part of informed consent. Under the Code of Ethics administered by the New Zealand Chiropractic Board, practitioners are required to explain proposed treatments in terms the patient can understand, including the nature of the adjustment and any alternatives. A patient who asks “What technique will you use, and why?” is exercising a right, not overstepping a boundary.

Beyond that baseline, there are practical questions worth raising. If manual adjustment is proposed and the patient is uncertain about it, asking whether an instrument-assisted alternative is available is entirely appropriate. If a patient has been treated elsewhere with a specific technique that worked well, mentioning that provides useful clinical information. Similarly, if a previous adjustment was painful or caused a flare-up, that history matters — it may lead the chiropractor to select a gentler approach or to adjust their force and positioning.

The quality of a chiropractor’s response to these questions is itself informative. A practitioner who explains their reasoning clearly, who acknowledges alternatives, and who adjusts their plan when presented with new information is demonstrating exactly the kind of patient-centred practice that regulatory standards are designed to encourage.

What Matters More Than the Name of the Technique

The names of chiropractic techniques carry weight in professional circles, and they serve a useful function in distinguishing one clinical approach from another. But for the patient deciding where to seek treatment, technique names are a starting point rather than a destination. A practitioner who uses Diversified technique with careful assessment, clear communication, and genuine attention to the patient’s response will deliver better care than one who uses a more specialised method mechanically.

What matters most is whether the chiropractor reasons through the choice rather than defaulting to a single approach for every patient. The techniques described here are tools, and like any tools, their value depends on the judgement of the person using them. A patient who understands the basic landscape — that manual and instrument-assisted methods exist, that evidence supports spinal manipulation broadly, and that technique selection should be individualised — is better positioned to participate in their own treatment decisions.

That participation is the real point. The informed patient is not one who arrives requesting Gonstead by name, but one who asks good questions, understands the answers, and trusts the practitioner enough to engage in the process. Understanding what the techniques are and how they differ is a step toward that kind of therapeutic relationship — not a substitute for it.

The variety of chiropractic techniques practised in New Zealand reflects a profession that has not settled on a single method — because no single method suits every patient or every condition. That diversity is a strength, provided the patient knows enough to navigate it. The techniques differ in their mechanics, their evidence profiles, and their clinical applications, but they share a common thread: their value depends less on which one is chosen than on the reasoning behind the choice, and on whether the patient is a genuine participant in making it.