Manual Therapy: What Do Therapists Believe Is Really Happening?

One of the biggest challenges in healthcare is translating research into everyday clinical practice. We have growing evidence about how manual therapy works at a biological level, but it’s not always clear whether this science shapes what therapists believe—or how they explain treatment effects to patients.

A recent national survey of 569 German physical therapists explored exactly that: what do therapists think causes the immediate pain relief and improved movement often seen after manual therapy?

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What Did the Study Do?

Therapists were given a simple case scenario:
A patient has neck pain and limited rotation for three weeks. A therapist performs a passive mobilization at C4/5. The patient immediately reports less pain and improved movement.

Participants were asked:

• Which anatomical structures are involved?
• Which physiological mechanisms explain the immediate improvement?
• How effective is manual therapy in this situation?

They rated involvement from 0–100%.

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What Structures Do Therapists Think Are Involved?

Most therapists believed the following played a major role (rated ≥50% involvement):

• Brain (75%)
• Myofascial tissues (71%)
• Peripheral nervous system (68%)
• Spinal joints (60%)

Interestingly, fewer therapists believed the spinal cord (25%) or intervertebral discs (18%) were strongly involved.

Key takeaway: Therapists largely recognize that manual therapy is not just “about joints”—the brain and nervous system are seen as central players.

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What Mechanisms Were Considered Important?

The most commonly selected mechanisms were:

• Endogenous pain modulation (73%)
• Placebo/contextual effects (72%)
• Changes in muscle activity (68%)
• Neuromuscular responses (62%)
• Autonomic responses (58%)
• Blood circulation (56%)
• Myofascial biomechanics (53%)

Fewer therapists believed inflammatory mediators (38%) or disc biomechanics (20%) were major contributors.

This suggests many therapists now see manual therapy effects as at least partly neurophysiological, not purely mechanical.

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Do Therapist Beliefs Depend on Background?

Demographics and professional background explained only a small part of the variation in beliefs (generally <20%).

However:

• More hands-on time was linked to stronger biomechanical beliefs.
• Male therapists were more likely to emphasize joints, discs, and biomechanics.
• Therapists with less hands-on time and experience were more likely to attribute effects to placebo.

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What Influences Perceived Effectiveness?

Therapists rated manual cervical mobilization as moderately effective (average 66/100).

Interestingly:

• Belief in joint and myofascial involvement explained about 31% of how effective therapists thought manual therapy was.
• Belief in muscle activity, joint biomechanics, and endogenous pain modulation increased perceived effectiveness.
• Greater belief in placebo effects was linked to lower perceived effectiveness.

In other words:
What therapists believe about how manual therapy works strongly influences how effective they think it is.

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What Does the Research Actually Say?

Current evidence increasingly supports a neurophysiological model, including:

• Brain involvement
• Descending pain modulation
• Contextual effects (expectation, therapeutic alliance)
• Changes in central pain processing

Evidence for purely biomechanical mechanisms—like “realigning joints” or correcting segmental dysfunction—is inconsistent or limited.

Research also suggests:

• Manual therapy may change muscle activity.
• Effects on autonomic responses and blood flow remain unclear.
• Inflammatory changes may occur, but evidence is mixed.

Overall, pain relief appears largely independent of precise biomechanical correction.

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Why This Matters Clinically

Therapist beliefs influence:

• Communication style
• Confidence
• Therapeutic alliance
• Patient expectations

And these factors significantly affect outcomes.

If therapists frame manual therapy as “putting joints back in place,” patients may adopt outdated biomedical beliefs. These can increase fear, anxiety, and dependency.

In contrast, explaining effects through pain neuroscience and nervous system modulation can reduce fear, catastrophizing, and healthcare overuse.

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The Real Clinical Message

Manual therapy likely works through a combination of:

• Nervous system modulation
• Contextual/placebo effects
• Muscle activity changes
• Therapeutic alliance

Biomechanics may play a role—but probably not in the way traditional models suggest.

The study highlights a persistent gap between evolving research and clinical explanations. Many therapists are moving toward neurophysiological thinking—but biomechanical narratives remain influential.

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For Therapists: Practical Reflection Questions

• How do you explain manual therapy to patients?
• Do your explanations align with current pain science?
• Are your beliefs shaping your perceived treatment effectiveness?
• Could shifting your language improve patient outcomes?

Bridging the gap between mechanistic research and clinical practice isn’t just academic—it directly influences how we treat, communicate, and ultimately help our patients.