When the Adjustment Won't Release — What's Actually Happening
- Dr. Lucas Marchand
- Jul 28
- 5 min read
By Dr. Lucas Marchand, DC — MyChiro Mobile Chiropractic, Sioux Falls, SD
Some of my longest-standing patients have been seeing me for years. Most visits follow a predictable and efficient pattern — the restricted segments are identifiable on palpation, the tissue responds to preparation, the adjustment produces the familiar cavitation, and the patient walks away with the relief they came for. Straightforward. Reliable.
Then occasionally one of those same patients — someone I know well, whose spine I've treated dozens of times — shows up with a thoracic or lumbar segment that simply won't move.
Not because they're guarding consciously. Not because they're anxious or tense in any way they're aware of. The tissue itself resists. The joint that has released freely on ten previous visits declines to do so today. I work the surrounding tissue, adjust my contact, modify my approach — and sometimes the patient says something I've heard more than once:
"Hmm. Must not need it then."
It's a reasonable conclusion from the outside. No pop, no release, no obvious change — so maybe the joint was fine to begin with. The logic is intuitive. It's also almost entirely wrong. And understanding why it's wrong is one of the more clinically useful things a chiropractic patient can know.
What the Cavitation Actually Is
The pop — the audible release that most people associate with a chiropractic adjustment — is a cavitation event. When a synovial joint is distracted rapidly, the pressure inside the joint space drops suddenly and dissolved gases in the synovial fluid form a bubble. That bubble collapsing produces the sound.
The cavitation is a byproduct of the joint releasing. It's not the goal. It's not a marker of whether the adjustment was successful. It's not evidence that something was "put back in place." It's simply what happens when a restricted joint receives the right mechanical input and restores its normal range of motion.
This distinction matters because it changes what the absence of cavitation means. A joint that doesn't pop isn't a joint that didn't need treatment. It's a joint that hasn't yet received the input that allows it to release — which is a different problem entirely.
What's Actually Happening When the Joint Won't Move
When a spinal segment resists adjustment in a patient who has no history of significant degenerative change, no acute inflammatory presentation, and no obvious reason for the resistance — the most likely explanation is involuntary neuromuscular guarding.
This is different from the conscious guarding that happens when a patient is anxious or anticipating discomfort. That kind of guarding is identifiable — the patient braces, the tissue feels different, the whole presentation is tighter than usual. What I'm describing is something subtler. The patient is completely relaxed by any measure available to them. They're not doing anything differently. But the muscles surrounding the restricted segment have independently decided to maintain a protective contraction that overrides the mechanical input of the adjustment.
The nervous system has a sophisticated and largely unconscious system for protecting joints it perceives as vulnerable. When a segment has been restricted for long enough — or when something about the tissue state on a given day meets a threshold the nervous system interprets as requiring protection — the surrounding musculature can contract in a way that effectively splints the joint against external force. The patient isn't aware of this happening. It's not under their voluntary control. The muscle simply has a different agenda than the adjustment.
This is the same protective mechanism that produces the guarding pattern in acute back pain — just operating in a more subtle and localized way in a patient who isn't otherwise symptomatic. The difference between an acute presentation and a resistant segment in a long-term patient is mostly one of degree.
What Changes When the Technique Changes
When a prone thoracic adjustment — contact on the posterior thoracic segments with a posterior to anterior line of drive — fails to produce movement, the answer is usually not to apply more force in the same direction. It's to change the mechanical vector entirely.
The technique I use in these situations is a supine thoracic adjustment. The patient rolls onto their back, crosses their arms over their chest, and I position my contact through my own body against the posterior thoracic segments. The line of drive is delivered through a body drop — my weight rather than my arm strength — in an anterior to posterior direction from the patient's perspective. It's sometimes described as a mortician's adjustment or a crossed-arm technique. Patients occasionally call it the bear hug, which isn't inaccurate.
The mechanical difference between the two approaches is significant. The prone adjustment asks the joint to move against its own supporting tissue while the patient's body weight works against the force vector. The supine adjustment uses the patient's body weight as part of the force delivery — the table provides a fixed point, the body drop provides a controlled impulse, and the joint is addressed from a fundamentally different angle.
What happens when the right vector finds the resistant segment is immediate and unambiguous. The joint cavitates — the same sound, the same quality of release as any other adjustment. The patient reports the same instant relief they report after a straightforward visit. The resistance wasn't evidence that nothing was wrong. It was evidence that the approach needed to change.
Why This Matters for Patients
The "must not need it then" conclusion is understandable because most patients have internalized the cavitation as the marker of a successful visit. No pop equals no adjustment equals nothing happened. That model is wrong in a specific and important way.
What the cavitation actually signals is that the joint received the right mechanical input and responded. The absence of cavitation on a given technique doesn't mean the joint is fine — it means that particular technique, applied at that angle with that force vector, wasn't the right input for that joint on that day. The joint still needed treatment. The treatment needed to find a different path to the same destination.
This is also why the number of techniques a chiropractor has available matters clinically. The treatment sequence at MyChiro involves technique selection based on what the assessment and the tissue response reveal — Diversified, Thompson Drop, Activator, supine thoracic approaches — not a single method applied uniformly to every patient and every segment regardless of response. A joint that resists one approach often responds immediately to another. The skill is recognizing when to change rather than applying more force in a direction that isn't working.
The Interesting Clinical Detail
What I find genuinely interesting about these resistant segment presentations in long-term patients is that they don't follow an obvious pattern. Age doesn't reliably predict them. Activity level sometimes correlates — more physically active patients seem to present with this occasionally after periods of increased loading — but not consistently enough to be a reliable indicator. Occupation doesn't seem to be a factor.
The most consistent feature is that these patients have been seeing me for years. Which raises a question worth sitting with: does the nervous system's protective response become more sophisticated over time in patients who receive regular chiropractic care? Does the tissue develop a more nuanced capacity for localized guarding precisely because the adjusting relationship has been long enough that the system has learned what to expect?
I don't have a definitive answer to that. What I observe is that the resistant segment in a long-term patient is almost always temporary. The technique changes, the joint releases, the relief is immediate. And the following visit, that same segment is usually completely straightforward again.
Getting Care in Sioux Falls
MyChiro serves Sioux Falls, Brandon, Tea, Harrisburg, Renner, Canton, and the surrounding area. Same-day appointments are usually available.
Book your visit here. Or call or text (605) 201-4862.
