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PurposeMany systematic reviews have reported on the effectiveness of spinal manipulative therapy (SMT) for low back pain (LBP) in adults. Much less is known about the older population regarding the effects of SMT.ObjectiveTo assess the effects of SMT on pain and function in older adults with chronic LBP in an individual participant data (IPD) meta-analysis.SettingElectronic databases from 2000 until June 2020, and reference lists of eligible trials and related reviews.Design and subjectsRandomized controlled trials (RCTs) which examined the effects of SMT in adults with chronic LBP compared to interventions recommended in international LBP guidelines.MethodsAuthors of trials eligible for our IPD meta-analysis were contacted to share data. Two review authors conducted a risk of bias assessment. Primary results were examined in a one-stage mixed model, and a two-stage analysis was conducted in order to confirm findings.Main outcomes and measuresPain and functional status examined at 4, 13, 26, and 52 weeks.Results10 studies were retrieved, including 786 individuals, of which 261 were between 65 and 91 years of age. There is moderate-quality evidence that SMT results in similar outcomes at 4 weeks (pain: mean difference [MD] − 2.56, 95% confidence interval [CI] − 5.78 to 0.66; functional status: standardized mean difference [SMD] − 0.18, 95% CI − 0.41 to 0.05). Second-stage and sensitivity analysis confirmed these findings.ConclusionSMT provides similar outcomes to recommended interventions for pain and functional status in the older adult with chronic LBP. SMT should be considered a treatment for this patient population.

Spinal manipulative therapy (SMT) has been shown to significantly alleviate pain in patients with lumbar disc herniation (LDH), with its effects closely associated with brain function modulation. This study investigates the neural biomarkers linked to pain relief efficacy following a complete SMT treatment cycle in LDH patients. A total of 59 LDH patients were randomized into two groups: SMT treatment (Group 1, n = 28) and sham treatment (ST) (Group 2, n = 31). A matched healthy control group (Group 3, n = 28) was also included. Functional magnetic resonance imaging (fMRI) was performed on LDH patients at two time points (TPs)—before (TP1) and after (TP2) treatment—while healthy controls were scanned once. Clinical assessments were conducted using the Visual Analogue Scale (VAS) and the Japanese Orthopaedic Association (JOA) scale. Post-treatment results indicated significant improvements in both VAS and JOA scores for Group 1, while the improvement was limited to VAS scores for Group 2. Graph properties analysis revealed notable differences in brain network connectivity between LDH patients and healthy controls, particularly between the left precentral gyrus (left PreCG) and left inferior frontal gyrus, opercular part (left IFGoperc). Enhanced functional connectivity (FC) was observed in Group 1, notably between the right angular gyrus (right ANG) and the left middle orbital gyrus (left ORBmid), with right ANG showing a significant positive correlation with clinical scores. This study identifies the sensorimotor network—salience network are significantly activated in chronic pain among LDH patients. The default mode network—dorsal attention network may serve as key neural biomarkers for the efficacy of SMT treatment in alleviating pain in LDH.

Background Manual therapy, including spinal manipulative therapy (SMT), is a core component of chiropractic education. Simulation tools such as the Human Analogue Mannequin (HAM ® ) have been developed and coupled with force-sensing technology to support safe and structured training of SMT force-time characteristics. However, it remains unclear whether motor skills acquired using these tools are transferable to real-world scenarios. Methods This sequential explanatory mixed-methods observational study investigated whether chiropractic students, proficient at applying a set of pre-specified SMT force-time characteristics to the HAM ® , could replicate those same characteristics in humans. Quantitative data measured SMT force-time characteristics (preload force, peak impulse force, time to peak impulse force) applied on the HAM ® . Participants meeting the predefined force-time criteria in 4 out of 5 trials proceeded to apply SMTs to a human. Qualitative data from a survey with open-ended questions explored participants’ perceptions of their ability to replicate the SMT and differences between the HAM ® and humans. Results Ninety-five students participated (56% female, median age: 25 years), and 50 (53%) met the criteria on the HAM ® . Thirty-seven (74%) of the participants who met the criteria on the HAM ® also met the criteria on humans. No significant differences in participant characteristics were found between those who met or did not meet the criteria when applying SMT on humans. Participants who did not meet SMT force-time criteria on either the HAM ® or humans often under-applied preload force. Time to peak impulse force criteria was usually met across all trials. Qualitatively, participants perceived that internal factors (e.g., previous experience, emotions, tactile feel) and differences between the HAM ® and humans (e.g., stiffness, breathing) influenced their ability to replicate the SMT force-time criteria on humans. Conclusion Most students who successfully applied SMT force-time characteristics on a mannequin were able to replicate them on humans. Not meeting the SMT proficiency criteria (particularly in preload force) and the influence of non-biomechanical factors highlights the complexity of manual therapy motor skill development.

Background Research waste is defined as research outcomes with no or minimal societal benefits. It is a widespread problem in the healthcare field. Four primary sources of research waste have been defined: (1) irrelevant or low priority research questions, (2) poor design or methodology, (3) lack of publication, and (4) biased or inadequate reporting. This commentary, which was developed by a multidisciplinary group of researchers with spinal manipulative therapy (SMT) research expertise, discusses waste in SMT research and provides suggestions to improve future research. Main text This commentary examines common sources of waste in SMT research, focusing on design and methodological issues, by drawing on prior research and examples from clinical and mechanistic SMT studies. Clinical research is dominated by small studies and studies with a high risk of bias. This problem is compounded by systematic reviews that pool heterogenous data from varying populations, settings, and application of SMT. Research focusing on the mechanisms of SMT often fails to address the clinical relevance of mechanisms, relies on very short follow-up periods, and has inadequate control for contextual factors. Conclusions This call to action is directed to researchers in the field of SMT. It is critical that the SMT research community act to improve the way research is designed, conducted, and disseminated. We present specific key action points and resources, which should enhance the quality and usefulness of future SMT research.

Background Muscle energy techniques are applied to reduce pain and increase range of motion. These are applied to a variety of pathological conditions and on asymptomatic subjects. There is however limited knowledge on their effectiveness and which protocol may be the most beneficial. Objective The aim of this review is to determine the efficacy of muscle energy techniques (MET) in symptomatic and asymptomatic subjects. Design Systematic Review. Methods A literature search was performed using the following database: Cochrane Library, MEDLINE, NLM Pubmed and ScienceDirect. Studies regarding MET in asymptomatic and symptomatic patients were considered for investigation. The main outcomes took into account range of motion, chronic and acute pain and trigger points. Two trained investigators independently screened eligible studies according to the eligibility criteria, extracted data and assessed risk of bias. Randomized control trials (RCT’s) were analyzed for quality using the PEDro scale. Results A total of 26 studies were considered eligible and included in the quantitative synthesis: 14 regarding symptomatic patients and 12 regarding asymptomatic subjects. Quality assessment of the studies through the PEDro scale observed a “moderate to high” quality of the included records. Conclusions MET are an effective treatment for reducing chronic and acute pain of the lower back. MET are also effective in treating chronic neck pain and chronic lateral epicondylitis. MET can be applied to increase range of motion of a joint when a functional limitation is present. Other techniques seem to be more appropriate compared to MET for trigger points.

Background Spinal manipulative therapy (SMT) is frequently used to manage neck pain; however, its efficacy and safety in treating acute neck pain (ANP) remain uncertain and require further investigation. Objectives This study aims to comprehensively evaluate the efficacy and safety of SMT in the treatment of ANP. Databases and data treatment A thorough search was conducted in PubMed, Embase, Web of Science, PEDro, and Cochrane Library databases, covering all studies from inception to March 20, 2023. Mean differences (MD) with 95% confidence intervals (CIs) were calculated to assess outcomes such as pain intensity, cervical range of motion (CROM), and disability. The PEDro Scale and the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) approach were utilized to evaluate the methodological quality and strength of evidence. Results Eight randomized controlled trials (RCTs) with 965 patients were included. Their PEDro scores ranged from 4—9 (mean: 6.38, SD: 1.25). Forest plot analysis showed SMT was better than the control in reducing pain (MD = -1.53, 95% CI [-2.22, -0.83]) and improving CROM in all measured aspects. It also significantly reduced disability scores (MD = -6.20, 95% CI [-9.81, -2.59]). No serious adverse events were reported. Conclusions The evidence supports the use of SMT as an effective and safe intervention for reducing pain, improving CROM, and decreasing disability in patients with ANP. These findings provide valuable insights for clinical practitioners and highlight the potential of SMT as a viable therapeutic option in managing ANP. Systematic review registration PROSPERO CRD42021264411.

Patellofemoral pain syndrome (PFPS) is one of the most common determinants of knee pain. The causes of PFPS are multifactorial, and most treatment approaches are conservative. There are many kinds of therapy for this syndrome, which are based on building strength, flexibility, proprioception, and endurance. Training is functional and progression is gradual. Our hypothesis is that total-body osteopathic manipulative therapy (OMTh; manipulative care provided by foreign-trained osteopaths) focused on the management of somatic dysfunctions could be useful for managing the pain of patients with PFPS.To investigate the effect of OMTh on pain reduction in patients with PFPS.This pilot study was randomized, controlled, and single-blinded with 2 months of follow-up. Qualified participants were randomly assigned to 1 of 2 groups: OMTh group or placebo group. Each participant received either 4 sessions of OMTh or 4 sessions of manual placebo intervention that consisted of passive touching without joint mobilization in a protocolled order. A visual analogue scale (VAS) was used to assess general knee pain, peripatellar pain, pain after prolonged sitting, pain during the patellar compression test, and pain during stair ascent and descent. Pain assessment was performed before the baseline (T0), second (T1), third (T2), and fourth (T3) sessions, and follow-up (T4) was performed 8 weeks after T3.Thirty-five participants were enrolled the study. The VAS score was significantly reduced and clinically relevant in the OMTh group after each treatment and after 2 months of follow-up. The change in the VAS score before each treatment indicates that the most improved areas at T1 compared with T0 were lumbar and sacral with improvements in 83% and 40% of patients, respectively. At T2 compared with T1, the most improved areas were cervical and sacral with improvements found in 58% and 36% of patients, respectively. The number of dysfunctions that were diagnosed decreased during the baseline to T3 period (40% change). The correlation analysis showed significant results for the dysfunction and the compression test at T2 (P=.01, ρ=0.543).Significant differences in VAS scores were found between the OMTh and placebo groups. These findings underline how OMTh can lead to reduced pain in patients with PFPS.

Objective To elucidate how spinal manipulative therapy (SMT) exerts its analgesic effects through regulating brain function in lumbar disc herniation (LDH) patients by utilizing resting-state functional magnetic resonance imaging (rs-fMRI). Methods From September 2021 to September 2023, we enrolled LDH patients (LDH group, n =31) and age- and sex-matched healthy controls (HCs, n =28). LDH group underwent rs-fMRI at 2 distinct time points (TPs): prior to the initiation of SMT (TP1) and subsequent to the completion of the SMT sessions (TP2). SMT was administered once every other day for 30 min per session, totally 14 treatment sessions over a span of 4 weeks. HCs did not receive SMT treatment and underwent only one fMRI scan. Additionally, participants in LDH group completed clinical questionnaires on pain using the Visual Analog Scale (VAS) and the Japanese Orthopedic Association (JOA) score, whereas HCs did not undergo clinical scale assessments. The effects on the brain were jointly characterized using the amplitude of low-frequency fluctuations (ALFF) and regional homogeneity (ReHo). Correlation analyses were conducted between specific brain regions and clinical scales. Results Following SMT treatment, pain symptoms in LDH patients were notably alleviated and accompanied by evident activation of effects in the brain. In comparison to TP1, TP2 exhibited the most significant increase in ALFF values for Temporal_Sup_R and the most notable decrease in ALFF values for Paracentral_Lobule_L (voxelwise P<0.005; clusters >30; FDR correction). Additionally, the most substantial enhancement in ReHo values was observed for the Cuneus_R, while the most prominent reduction was noted for the Olfactory_R (voxelwise P <0.005; clusters >30; FDR correction). Moreover, a comparative analysis revealed that, in contrast to HCs, LDH patients at TP1 exhibited the most significant increase in ALFF values for Temporal_Pole_Sup_L and the most notable decrease in ALFF values for Frontal_Mid_L (voxelwise P <0.005; clusters >30; FDR correction). Furthermore, the most significant enhancement in ReHo values was observed for Postcentral_L, while the most prominent reduction was identified for ParaHippocampal_L (voxelwise P <0.005; clusters >30; FDR correction). Notably, correlation analysis with clinical scales revealed a robust positive correlation between the Cuneus_R score and the rate of change in the VAS score ( r =0.9333, P <0.0001). Conclusions Long-term chronic lower back pain in patients with LDH manifests significant activation of the “AUN-DMN-S1-SAN” neural circuitry. The visual network, represented by the Cuneus_R, is highly likely to be a key brain network in which the analgesic efficacy of SMT becomes effective in treating LDH patients. (Trial registration No. NCT 06277739)

Background Manipulation-induced hypoalgesia (MIH) represents reduced pain sensitivity following joint manipulation, and has been documented in various populations. It is unknown, however, whether MIH following high-velocity low-amplitude spinal manipulative therapy is a specific and clinically relevant treatment effect. Methods This systematic critical review with meta-analysis investigated changes in quantitative sensory testing measures following high-velocity low-amplitude spinal manipulative therapy in musculoskeletal pain populations, in randomised controlled trials. Our objectives were to compare changes in quantitative sensory testing outcomes after spinal manipulative therapy vs. sham, control and active interventions, to estimate the magnitude of change over time, and to determine whether changes are systemic or not. Results Fifteen studies were included. Thirteen measured pressure pain threshold, and four of these were sham-controlled. Change in pressure pain threshold after spinal manipulative therapy compared to sham revealed no significant difference. Pressure pain threshold increased significantly over time after spinal manipulative therapy (0.32 kg/cm 2 , CI 0.22–0.42), which occurred systemically. There were too few studies comparing to other interventions or for other types of quantitative sensory testing to make robust conclusions about these. Conclusions We found that systemic MIH (for pressure pain threshold) does occur in musculoskeletal pain populations, though there was low quality evidence of no significant difference compared to sham manipulation. Future research should focus on the clinical relevance of MIH, and different types of quantitative sensory tests. Trial registration Prospectively registered with PROSPERO (registration CRD42016041963 ).

Objective Soft tissue manual therapies are commonly utilized by osteopathic physicians, chiropractors, physical therapists and massage therapists. These techniques are predicated on subjecting tissues to biophysical mechanical stimulation but the cellular and molecular mechanism(s) mediating these effects are poorly understood. Previous studies established an in vitro model system for examining mechanical stimulation of dermal fibroblasts and established that cyclical strain, intended to mimic overuse injury, induces secretion of numerous pro-inflammatory cytokines. Moreover, mechanical strain intended to mimic soft tissue manual therapy reduces strain-induced secretion of pro-inflammatory cytokines. Here, we sought to partially confirm and extend these reports and provide independent corroboration of prior results. Results Using cultures of primary human dermal fibroblasts, we confirm cyclical mechanical strain increases levels of IL-6 and adding long-duration stretch, intended to mimic therapeutic soft tissue stimulation, after cyclical strain results in lower IL-6 levels. We also extend the prior work, reporting that long-duration stretch results in lower levels of IL-8. Although there are important limitations to this experimental model, these findings provide supportive evidence that therapeutic soft tissue stimulation may reduce levels of pro-inflammatory cytokines. Future work is required to address these open questions and advance the mechanistic understanding of therapeutic soft tissue stimulation.