Physiomobile Partner Learning

What the Latest Research Says About Manual Therapy for Slipped Disc

A partner review of recent evidence on manual therapy and spinal manipulation for lumbar and cervical disc herniation, including effect sizes, certainty, safety data and the limits of each study.

Physiomobile Team · 23 September 2026 · 11 min read

AI-generated depiction of a male physiotherapist performing a lumbar mobilisation technique on a male adult patient; not real people or a real treatment session

AI-generated editorial image; it does not depict actual people, a real treatment session or a patient outcome.

47 RCTs4,480 patientsPooled lumbar disc herniation meta-analysis, 2025; most trials were conducted in China at low-to-moderate quality.

RR 1.20clinical effectiveness95% CI 1.15–1.25 in that meta-analysis; GRADE certainty moderate for pain and effectiveness only.

76 RCTsCochrane 2026Chronic low back pain review with 11,866 participants; trials examining sciatica alone were excluded.

34,376per matched cohortCauda equina syndrome risk did not differ significantly between SMT and therapist-led exercise (RR 0.88).

Animated pathway from assessment to plan, practice and review

“Slipped disc” is not a single diagnosis. Patients use the term for several different presentations: a disc bulge with no leg symptoms, a herniation with radiculopathy, or mechanical back pain with no direct disc involvement. The evidence for manual therapy also differs depending on which group was actually studied.

This article reviews six recent studies available through PubMed. The purpose is not to confirm manual therapy as a universal solution, but to show what the evidence supports, how certain it is, and what remains unanswered.

How to read this article: every study is presented with its population, effect size and limitations. A large effect size in a low-quality study is not strong evidence. Clinical decisions still depend on individual assessment.

1. The largest meta-analysis to date for lumbar disc herniation

Manual therapy for LDH: 47 RCTs, 4,480 patients

Clinical efficacy of Chinese manual therapy for lumbar disc herniation: A systematic review and meta-analysis. Complementary Therapies in Medicine, 2025. PMID 41177367.

This review pooled 47 randomised controlled trials involving 4,480 patients with lumbar disc herniation. Manual therapy was associated with superior clinical effectiveness compared with control groups, alongside consistent pain reduction and functional improvement across studies.

RR 1.20Clinical effectiveness, 95% CI 1.15–1.25

SMD 1.23Pain reduction, 95% CI 0.98–1.49

−14.47Mean ODI point reduction

JOA functional scores also improved (SMD 1.42, 95% CI 1.07–1.77). The authors reported limited evidence of reduced inflammatory markers including TNF-α, IL-1β and IL-6, but classified these findings as low certainty.

Limitations: GRADE certainty was moderate for pain relief and clinical effectiveness, but low for other outcomes. Most included trials were conducted in China with low-to-moderate methodological quality. The authors themselves call for cautious interpretation and higher-quality multicentre international RCTs.

2. An RCT in MRI-confirmed LDH with radiculopathy

Manual therapy was the base treatment in both arms

Short-Term Effects of Manual Therapy Combined with Functional Magnetic Stimulation in Individuals with Lumbar Disk Herniation with Radiculopathy: A Randomized Clinical Trial. Medicina (Kaunas), 2026. PMID 41752649.

Forty adults with MRI-confirmed unilateral LDH with radiculopathy received ten treatment sessions over three weeks. Both groups received manual therapy; one group additionally received functional magnetic stimulation.

Group × time interactions were significant for all outcomes (p < 0.01). Reductions in back and leg pain, RMDQ disability and S-LANSS neuropathic pain scores exceeded established MCID thresholds, while straight leg raise gains surpassed published MDC values.

Limitations: small sample (n = 40), no untreated control arm, and only short-term week-three outcomes were reported. The trial demonstrates the added value of FMS; it does not prove manual therapy is superior to other active care.

AI-generated depiction of a female physiotherapist performing a straight leg raise test with an adult female patient; not a real patient — AI-generated editorial image. Straight leg raise and neurological screening provide objective markers that can be reassessed after intervention. It does not depict an actual patient, clinician or outcome.

3. Cochrane review: spinal manipulative therapy for chronic low back pain

76 RCTs, 11,866 participants

Spinal manipulative therapy for adults with chronic low back pain. Cochrane Database of Systematic Reviews, 2026. PMID 41494147.

This is an update of the 2011 Cochrane review, with searches to 18 October 2024. Seventy-six RCTs involving 11,866 participants met the inclusion criteria, 50 of them (66%) not present in the previous version. Seventeen trials (2,021 participants) compared SMT with sham SMT or placebo, and four trials (435 participants) compared it with no treatment.

Important limitation for slipped disc context: this review explicitly excluded studies that examined sciatica alone. It is therefore not direct evidence for disc herniation with radiculopathy. Treat it as a methodological and chronic low back pain reference, not as direct support for slipped disc cases.

4. Mobilisation for cervical disc herniation

Kaltenborn-Evjenth OMT: cervical only versus cervical plus lumbar

The effect of neck mobilization vs. combined neck and lumbar mobilization on pain and range of motion in people with cervical disc herniation: A randomized controlled study. Journal of Bodywork and Movement Therapies, 2025. PMID 40483122. Registration NCT06858605.

Thirty-three participants with cervical disc herniation were randomised into two groups and treated three times weekly for four weeks. Both groups improved significantly in pain, range of motion, NPDI disability and SF-36 quality of life (p < 0.05).

The group receiving combined cervical and lumbar mobilisation showed greater improvement in flexion ROM, pain and disability than the cervical-only group.

Limitations: the sample was very small (n = 33) and the authors reported low power values for ROM and quality of life. They state directly that these results may lack clinical significance.

5. Mechanistic work: what happens at the disc tissue

Animal model: nucleus pulposus resorption through the JNK pathway

Spinal manipulative therapy promotes nucleus pulposus resorption and alleviates pain in a rat model of lumbar disc herniation via JNK-dependent regulation of inflammation and tissue remodeling. American Journal of Translational Research, 2026. PMID 41868936.

A rat LDH model was established by implanting autologous nucleus pulposus onto the L5 nerve root. Animals received SMT every other day, weekly epidural betamethasone, or sham treatment. SMT attenuated mechanical allodynia from day three and produced near-complete nucleus pulposus resorption by day 28, outperforming the steroid group in both analgesia and tissue restoration.

Unlike the steroid’s broad anti-inflammatory suppression, SMT maintained a balanced microenvironment: moderately elevated TNF-α, IL-1β, VEGF and MMP-3 supporting macrophage recruitment, neovascularisation and matrix remodeling, while reducing NP cell apoptosis. All these benefits were abolished in JNK2-knockout mice, confirming JNK as an essential mediator.

Limitations: this is preclinical animal research. It suggests a plausible mechanism but cannot be translated directly to human patients. Do not use these findings to promise patients that a disc will shrink.

AI-generated depiction of a male physiotherapist supervising an adult male patient performing active back rehabilitation; not a real patient — AI-generated editorial image. The evidence places manual therapy within multimodal care rather than as a standalone treatment. It does not depict an actual patient, clinician or outcome.

6. Safety data: cauda equina syndrome risk

Matched cohorts of 34,376 patients each

Chiropractic spinal manipulative therapy versus physical therapist-led exercise and the risk of cauda equina syndrome in adults with lumbar disc herniation, stenosis, or radiculopathy. PM&R, 2026. PMID 41482869.

This retrospective cohort study used the TriNetX research network in the United States with data spanning 2005 to 2025. Patients with a lumbar spine disorder were divided into a chiropractic spinal manipulative therapy cohort or a physical therapist-led therapeutic exercise cohort without SMT. Patients with pre-existing cauda equina syndrome, incontinence, serious spinal pathology and recent spine surgery or injection were excluded.

After propensity score matching, each cohort contained 34,376 patients. The risk of cauda equina syndrome did not differ significantly between groups (risk ratio 0.88, 95% CI 0.43–1.79, p = 0.715). The risk of bladder catheterisation and faecal incontinence was lower in the SMT cohort (both RR 0.50, p < 0.001).

Limitations: this is observational data rather than an RCT, and relies on health-record coding vulnerable to misclassification. Absence of a significant difference is not proof of absence of risk. Red flag screening and neurological assessment remain mandatory.

What this evidence actually supports

Short-term pain and function: these are the outcomes most consistently supported across LDH studies.
A role within multimodal care: no study presents manual therapy as a sufficient standalone treatment. Every trial combined it with other components or compared it against active care.
A reasonable safety profile when screening and patient selection are performed properly.

What this evidence does not support

Manual therapy is not proven to cure or shrink disc herniation in humans. Resorption findings so far are from an animal model.
Certainty for outcomes beyond pain and clinical effectiveness remains low.
The Cochrane chronic LBP review cannot be cited as direct evidence for sciatica or radiculopathy.
None of the studies above supports a specific dose, technique or grade as a universal formula for every slipped disc presentation.

Implications for Partner practice

Screen before treating. Red flags, progressive neurological findings, bladder or bowel disturbance, saddle anaesthesia and worsening motor weakness require escalation, not mobilisation.
Use objective markers. SLR, neurological screening, functional outcome measures and pain scales let you reassess honestly after an intervention.
Connect it to active rehabilitation. Manual therapy creates a window for movement; education, load management and graded exercise are what sustain it.
Communicate honestly. Describe short-term pain and function improvement as what the evidence supports, without promising structural disc change.
Document the reasoning. Record why a technique was selected, what changed afterwards and what would change the plan.

For Grade V and cervical interventions: high-velocity low-amplitude techniques require specific training, professional competency, informed consent and scope-of-practice compliance. For the cervical spine, consider vascular risk in line with the IFOMPT Cervical Framework before any manual intervention.

Sources and further reading

This professional education article summarises published research and is not individual clinical advice, a treatment protocol or a named clinician review. Study findings are reported with the authors’ stated limitations. Individual assessment, informed consent, scope of practice, professional standards and case-specific clinical judgement prevail.

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