Tactile Perception of Pressure and Volitional Thrust Intensity Modulate Spinal Manipulation Dose Characteristics

ObjectiveThe purpose of this study was to examine clinicians’ ability to modulate spinal manipulation (SM) thrust characteristics based on their tactile perception of pressure and volitional intensity.MethodsIn a cross-sectional, within-participants design, 13 doctors of chiropractic delivered SM thrusts of perceived least, appropriate, or greatest intensity of their perceived safe output level for an SM thrust on low-fidelity thoracic spine models of 4 different pressure levels. The participants performed SM over the course of 96 trials in a randomized order on combinations of thrust intensity and pressure. Dependent variables included normalized preload force, thrust force, thrust duration, peak acceleration, time to peak acceleration, and displacement. For all dependent measures, 2-factor within-participants analysis of variance models with repeated measures on both factors were performed.ResultsPreload force increased with intensity (F_2,24 = 9.72; P < .001) and model pressure (F_3,36 = 4.27; P = .011). Participants modulated thrust force and displacement as each also increased with intensity escalation (F_2,24 = 22.53, P < .001; F_2,18 = 45.20, P < .001). The highest accelerations were observed during the greatest intensity. Increased thrust force was delivered at higher model pressures (F_3,36 = 6.43; P < .001). A significant interaction demonstrated that as volitional thrust intensity increased, greater displacement was attained, particularly on low pressure models (F_6,54 = 11.06; P < .001). Thrust duration and time to peak acceleration yielded no significant differences.ConclusionSpinal manipulation thrust dosage was modulated by the chiropractors’ tactile perception of pressure and volitional intensity.     

Influence of Foot Orthotics Upon Duration of Effects of Spinal Manipulation in Chronic Back Pain Patients: A Randomized Clinical Trial

Objective

The purpose of this study was to investigate the effects of 4 weeks of custom foot orthotics on pain, disability, recurrence of spinal fixation, and muscle dysfunction in adult low back pain patients receiving limited chiropractic care.

Methods

Adult volunteers with low back pain of greater than or equal to 1 month's duration were randomized to receive custom orthotics (group A) or a flat insole sham (group B) with limited chiropractic care in 5 visits over 4 weeks. Primary outcome measures are as follows: Quadruple Numerical Pain Rating Scale (for back), the Roland-Morris Disability Questionnaire, the number of muscles grade 4 or lower on manual muscle testing, and the number of spinal fixations detected by motion palpation and vertebral challenge at intake (B1), 2 weeks later before treatment began and orthotic use was initiated (B2) and before each subsequent treatment at approximately days 3, 10, 17, and 24 after B2. Secondary outcome measures are correlations of all primary outcomes.

Results

Both groups improved on all Numerical Pain Rating Scale, Roland-Morris Disability Questionnaire, and the number of muscles from intake (B1) to final visit. Only group B yielded significant improvements in the number of spinal fixations. No outcome measures showed statistical difference between groups at any time point; however, those who wore custom orthotics longer each day showed trends toward greater improvements in some outcome measures.

Conclusions

Both groups improved with chiropractic care including spinal manipulation; however, there were no statistical differences shown between sham and custom orthotic groups. Future studies should formally measure the time that orthotics or shams are worn in a weight-bearing capacity each day.     

Lumbar Spinal Stenosis and Lower Extremity Motor Control: The Impact of Walking-Induced Strain on a Performance-Based Outcome Measure

Objective

The primary objective of this study was to quantify the lower extremity movements and capabilities of a population with lumbar spinal stenosis (LSS) compared with healthy age-matched controls under conditions of strain and no strain. The secondary objective was to identify challenging movement conditions for a population with LSS, on a lower limb aiming task with different levels of difficulty, compared with healthy age-matched controls under conditions of strain and no strain.

Methods

Using a nonrandomized, controlled, before-and-after design, LSS patients (n = 16) and healthy controls (n = 16) performed 2 blocks of great toe–pointing movements to a series of projected squares. Following block 1, participants completed a 12-minute progressive exercise treadmill test. Pointing movements were analyzed using 3D motion analysis. Behavioral and kinematic measures evaluated performance.

Results

Both groups' reaction times (RTs) lengthened as task difficulty increased. An interaction revealed that LSS patients were more adversely impacted by task difficulty, F (3,372) = 4.207; P = .006. The progressive exercise treadmill test facilitated RT for both groups, F (1,124) = 5.105; P = .026. Control participants showed less variability in time-to-peak velocity poststrain, a benefit not shared by LSS patients, t (31) = 2.149; P = .040.

Conclusion

A lower extremity movement task captured differences under strain between healthy and LSS populations. The lower extremity Fitts' Law task accurately measured differences between healthy and LSS participants. For the subjects in this study, strain was sufficient to prevent LSS patients from demonstrating improvement in the variability of the ballistic phase of movement execution, whereas LSS patients' movement performance remained unchanged. This study also showed that regardless of strain, as task difficulty increased, LSS patients were more adversely impacted in the planning and execution of their lower limb movements than healthy control participants. The lower extremity motor control task (Fitts' task) can be used as a performance-based outcome measure to measure differences between healthy and LSS populations.     

Clinical Outcomes in Neurogenic Claudication Using a Multimodal Program for Lumbar Spinal Stenosis: A Study of 49 Patients With Prospective Long-term Follow-up

ObjectiveThe purpose of this study was to assess long-term outcomes of a 6-week multimodal program (manual therapy, exercises, and self-management strategies) in patients with neurogenic claudication due to degenerative lumbar spinal stenosis.MethodsThis study evaluated 49 patients with neurogenic claudication who completed a 6-week multimodal program between 2010 and 2013. Outcomes included Oswestry Disability Index (ODI), Zurich Claudication Questionnaire (ZCQ), and Numeric Rating Scale. Mean differences, paired t tests, and the Wilcoxon rank-sum test were used to compare outcomes at baseline, 6 weeks, and long-term follow-up.ResultsTwenty-three patients completed the follow-up questionnaire (47% response rate). Median follow-up was 3.6 years (interquartile range: 3.3-4.6). The mean age was 73.5 years (standard deviation: 8.5). Between baseline and long-term follow-up, there were statistically significant and clinically important improvements in disability (ODI: -23.7 [95% confidence interval (CI): -15.7 to -31.6]; ODI walking item: -1.96 [95% CI: -1.34 to -2.57]; ZCQ function scale: -0.42 [95% CI: -0.10 to -0.70]) and pain (leg pain: -3.53 [95% CI: -1.80 to -5.20]; ZCQ symptom scale: -0.71 [95% CI: -0.30 to -1.10]), but not low back pain (Numeric Rating Scale: -1.03 [95% CI: -1.00 to 3.10]). There was no statistically significant change in any outcomes between 6 weeks and long-term follow-up.ConclusionIn a sample of patients with neurogenic claudication participating in a 6-week multimodal program, clinically important improvements in leg pain and disability, but not low back pain while walking, were maintained in the long term (median duration of 3.6 years) when compared to baseline.     

An Exploratory Analysis of Gender as a Potential Modifier of Treatment Effect Among Patients in a Randomized Controlled Trial of Integrative Acupuncture and Spinal Manipulation for Low Back Pain

ObjectiveTo identify the potential association of self-reported gender on pain and disability among patients in a randomized controlled trial of integrative acupuncture and spinal manipulation therapy (SMT) for low back pain (LBP).MethodsIn the original study, 100 participants with LBP were randomized to receive acupuncture, SMT, or both combined. Eighty completed treatment and were followed for 60 days. Primary outcome measures were the Roland-Morris Disability Questionnaire and numeric pain scales. This study was a secondary analysis and used regression models to estimate and test for gender-specific differences in outcomes from baseline through end of treatment.ResultsWomen assigned to acupuncture averaged a 3.8-point reduction in highest LBP vs 2.0 points for SMT, whereas men assigned to SMT averaged a 3.5-point reduction vs 1.8 points for acupuncture (P for interaction = .04). There was a trend toward the same for disability (P for interaction = .12). For women, acupuncture alone led to better outcomes without SMT, and for men, SMT alone led to better outcomes without acupuncture. Women who received acupuncture were more likely to experience 50% or greater reductions in disability and pain, whereas men who received SMT were more likely to experience 50% or greater reductions in disability and pain.ConclusionAn association was found between self-reported gender and response to LBP treatment. Women demonstrated a greater reduction in pain and disability with acupuncture and men with SMT. Future clinical trials should consider sex as a potential determinant of treatment outcomes for LBP.     

Influence of Peer-led Wheelchair Training on Wheelchair Skills and Participation in Older Adults: Clinical Outcomes of a Randomized Controlled Feasibility Trial

ObjectiveTo estimate treatment effect size of a peer-led Wheelchair Self-Efficacy Enhanced for Use (WheelSeeU) program on objective wheelchair skills (primary); and on perceived wheelchair skills capacity and performance, wheelchair use self-efficacy, satisfaction with participation, life-space mobility, and participation frequency (secondary); and to evaluate retention 6 months later (secondary).DesignRandomized controlled trial.SettingRehabilitation centers and communities.ParticipantsCommunity-living older adults (N=40).InterventionWheelSeeU comprised six 90-minute peer-led sessions of customized training (in pairs) according to participants’ goals. A support-trainer provided spotting. The control group comprised six 90-minute professional-led didactic information sessions (in pairs).Main Outcome MeasuresThe Wheelchair Skills Test (WST), Wheelchair Skills Test Questionnaire (WST-Q), Wheelchair Use Confidence Scale for Manual Wheelchair Users-Short Form (WheelCon-M-SF), Wheelchair Outcomes Measure (WhOM), Life-Space Mobility (LSA), and Late Life Function and Disability Index (LLFDI) were collected at baseline (T1), postintervention (T2), and 6 months postintervention (T3).ResultsOf 121 screened, 39 individuals did not meet the inclusion criteria and 41 declined to participate. Forty participants (64.5 years of age; 60% men) were randomized, 38 completed the intervention, and 35 completed T3 assessments. There were no adverse effects. WheelSeeU did not have a statistically significant greater effect on objective WST (primary) or WST-Q capacity, WheelCon, LSA, and LLFDI at T2 compared to the control group. Effect sizes were statistically significant and large for WST-Q performance (Cohen’s d=0.72) and the WhOM (Cohen’s d=0.82) at T2, and effects were retained at T3.ConclusionCompared to an active control group, WheelSeeU did not have a greater effect on wheelchair skills capacity. However, WheelSeeU should not be prematurely dismissed as an approach to potentially improve wheelchair skills performance and satisfaction with participation in meaningful activities. Sex and depression are important when designing interventions for older adults.