REF-390 · Bialosky et al., 2018 / Nijs et al., 2021 · Journal of Orthopaedic & Sports Physical Therapy · Paper · PubMed
Unraveling the Mechanisms of Manual Therapy: Modeling an Approach
Mechanical force triggers systemic neurophysiological pain inhibition; overall treatment effects are small
Key Findings
Manual therapy is popular with providers and patients, but systematic reviews do not strongly support its effectiveness; treatment effect sizes are small — possibly because of a "one-size-fits-all" approach
The authors' model: the mechanical force of a manual therapy intervention produces systemic neurophysiological responses that lead to pain inhibition — the benefit is neurophysiological, not a lasting biomechanical change in tissue
The mechanisms are likely a complex interaction of patient, provider and environment (context) factors; the commentary proposes the model to guide study design and interpretation and to identify patients likely to respond
(full text; not checked against the abstract) The model's branches are peripheral, spinal and supraspinal responses — descending pain modulation, autonomic change, and expectation/context effects
Practical Application
Bialosky's model: manual therapy works, when it works, by mechanical input triggering neurophysiological pain inhibition, with patient, provider and context all shaping the response — and systematic reviews find only small effects overall. What massage changes is mostly perception, not tissue; the perceived-tightness relief is real but modest.
Treat subjective relief as a legitimate recovery outcome — reduced perceived tightness can improve training quality — while not expecting objective stiffness (SWE) to change
Ritual and context are part of the mechanism, not a contaminant; a predictable, comfortable protocol is a fair way to use it
Keep the claim proportionate: the same commentary opens by noting that systematic reviews do not strongly support manual therapy's effectiveness
Limitations
Theoretical commentary — not a trial; the model is a framework for research, not a proven mechanism map
Written for clinical pain patients, not athletes
Placebo/context effect acknowledgement is philosophically contested
The Nijs 2021 half of this entry is unverified
How this entry was checked and changed
Why this level
regraded 2026-09-27 from B+: narrative commentary without systematic method, no data of its own
Content correction 2026-09-27
Type "Theoretical review", Level B+ -> clinical commentary, Level C+.
The four named mediators (periaqueductal grey, sympathetic down-regulation, interoception/body schema, placebo) -> the abstract states only "systemic neurophysiological responses leading to pain inhibition"; the model's branches are kept as a labelled full-text note.
Added the abstract's own caveat that systematic reviews do not strongly support manual therapy's effectiveness and that treatment effects are small; the lead was rewritten around it.