Reporting results in manual therapy clinical trials: A need for improvement

The Effectiveness of Mulligan's Techniques in Non-Specific Neck Pain: A Systematic Review and Meta-Analysis

BACKGROUND AND PURPOSE

Mulligan's techniques, such as Sustained Natural Apophyseal Glides (SNAGs) and Natural Apophyseal Glides (NAGs), are commonly applied by physiotherapists when treating patients with non-specific neck pain (NP). However, there has been no comprehensive synthesis of their effects in NP. This review aimed to assess the effectiveness of Mulligan's techniques in reducing pain, improving disability, and enhancing cervical range of motion (CROM) in adults with acute, subacute, or chronic NP.

METHODS

A systematic review with meta-analysis was conducted on randomized controlled trials (RCTs) comparing Mulligan's techniques with other interventions in adults with NP. Two reviewers independently conducted study selection, data extraction, and risk of bias (RoB) assessment. Meta-analyses were performed when clinical homogeneity was present; otherwise, a narrative synthesis was used. Certainty of evidence was rated using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.

RESULTS

Thirty-three studies were included. For acute and mixed (acute/subacute/chronic) NP, Mulligan's techniques were no more effective than other interventions for pain reduction, disability improvement, or CROM enhancement. However, in patients with chronic or uncertain chronicity NP, SNAGs combined with other interventions demonstrated superior outcomes-both statistically and sometimes clinically-compared to certain treatments like exercises and muscle-energy techniques, for reducing pain and disability and improving CROM. The certainty of evidence was rated very low.

DISCUSSION

Mulligan's techniques appear to be safe, simple, and potentially beneficial for managing mixed or chronic NP when combined with other interventions, presenting results that may be comparable or occasionally superior to other standard techniques.

IMPLICATIONS FOR PHYSIOTHERAPY PRACTICE

Physiotherapists may consider incorporating Mulligan's techniques, especially SNAGs, within broader NP treatment strategies, as they offer a feasible, low-risk option for improving patient outcomes, particularly for chronic NP cases when used alongside other therapies.

Comparison between 2000 and 2018 on the reporting of statistical significance and clinical relevance in physiotherapy clinical trials in six major physiotherapy journals: a meta-research design

DESIGN

Meta-research.

OBJECTIVE

To compare the prevalence of reporting p values, effect estimates and clinical relevance in physiotherapy randomised controlled trials (RCTs) published in the years 2000 and 2018.

METHODS

We performed a meta-research study of physiotherapy RCTs obtained from six major physiotherapy peer-reviewed journals that were published in the years 2000 and 2018. We searched the databases Embase, Medline and PubMed in May 2019, and extracted data on the study characteristics and whether articles reported on statistical significance, effect estimates and confidence intervals for baseline, between-group, and within-group differences, and clinical relevance. Data were presented using descriptive statistics and inferences were made based on proportions. A 20% difference between 2000 and 2018 was regarded as a meaningful difference.

RESULTS

We found 140 RCTs: 39 were published in 2000 and 101 in 2018. Overall, there was a high prevalence (>90%) of reporting p values for the main (between-group) analysis, with no difference between years. Statistical significance testing was frequently used for evaluating baseline differences, increasing from 28% in 2000 to 61.4% in 2018. The prevalence of reporting effect estimates, CIs and the mention of clinical relevance increased from 2000 to 2018 by 26.6%, 34% and 32.8% respectively. Despite an increase in use in 2018, over 40% of RCTs failed to report effect estimates, CIs and clinical relevance of results.

CONCLUSION

The prevalence of using p values remains high in physiotherapy research. Although the proportion of reporting effect estimates, CIs and clinical relevance is higher in 2018 compared to 2000, many publications still fail to report and interpret study findings in this way.