The clicky thing chiropractors use is called an Activator Adjusting Instrument. It’s a small, handheld, spring-loaded device that delivers a quick tap to the spine or joints. The clicking sound you hear comes from the device’s internal mechanism firing, not from your bones or joints cracking.
How the Activator Works
The Activator looks a bit like a small pogo stick or a thick pen with a rubber tip. When the chiropractor presses it against your skin and triggers it, an internal spring releases a fast, focused impulse into the targeted area. The key to the device is speed, not force. The thrust happens so quickly that your muscles don’t have time to tense up and resist it, which is what often happens during a traditional hands-on adjustment where the chiropractor manually pushes on your spine.
Because the impulse is faster than your body’s reflexive muscle tightening, less overall force is needed to move the joint. Think of it like tapping a nail with a quick flick versus slowly pushing it: the speed does the work. This is why the device feels like a light tap rather than a deep push, even though it’s generating enough force to shift a joint’s position slightly.
Why Chiropractors Use It Instead of Their Hands
Traditional chiropractic adjustments involve the chiropractor positioning your body and applying a manual thrust, often producing that signature popping or cracking sound (called joint cavitation). The Activator offers a different approach. It doesn’t twist or rotate the spine, and it doesn’t produce that cracking sensation. For some patients, this matters a lot.
The device is especially popular with older adults. A study in the Journal of Chiropractic Medicine noted that the Activator has potential advantages for geriatric patients because it uses low, adjustable force and avoids the rotation and extension movements that come with manual manipulation. It’s one of the most common chiropractic techniques used with patients over 55. Chiropractors also tend to reach for it when treating children, people who are nervous about the cracking sound, or anyone who prefers a gentler approach.
For patients with conditions like osteoporosis or spinal compression fractures, manual adjustments raise safety concerns because fragile bones may not tolerate the force well. The Activator’s lighter touch makes it a go-to option in these cases, though research on its safety profile in these populations is still limited.
What the Click Actually Is
The distinctive clicking noise is purely mechanical. It’s the sound of the spring inside the device releasing and snapping the plunger forward. Your joints aren’t popping. In fact, one reason researchers find the Activator useful in clinical studies is that even when it’s set to zero force (delivering no therapeutic impulse at all), it still makes the same audible click. This means the sound is entirely from the instrument, not from anything happening inside your body.
This is a meaningful difference from manual adjustments, where the cracking sound comes from gas bubbles releasing inside the joint fluid. With the Activator, what you hear is what you see: a device clicking.
Does It Work as Well as Manual Adjustments?
The honest answer is that the evidence is thin in both directions. A systematic review comparing the Activator to manual manipulation and other mobilization techniques for neck pain found mixed results across five studies. No single method was shown to be clearly superior. One finding leaned slightly in favor of the Activator for pain reduction, but the researchers cautioned that study quality was mostly poor, sample sizes were small, and follow-up was limited.
What’s clear is that many patients report feeling relief after Activator treatments, and chiropractors have been using the device for decades. It was co-invented in the 1970s by Dr. Arlan Fuhr, who founded Activator Methods International. Today it remains one of the most widely used instrument-based techniques in chiropractic care worldwide.
What to Expect During Treatment
If your chiropractor uses an Activator, the session typically feels very different from a traditional adjustment. You’ll usually lie face down on the treatment table. The chiropractor will assess your spine or joints, often by checking leg length differences or pressing on specific areas to identify where adjustments are needed. Then they’ll place the rubber tip of the Activator against the targeted spot and trigger it. You’ll feel a quick, light tap and hear the click. Most people describe it as surprising the first time but not painful.
The chiropractor may use the device on several spots during a single visit, working along the spine, pelvis, or other joints. Sessions tend to be quick, and there’s no recovery time needed afterward. You won’t experience the post-adjustment soreness that some people feel after more forceful manual techniques.