A summary of spasticity management--a treatment algorithm

Assessment of pain relief after four botulinum toxin A injection cycles in patients with post-stroke lower limb spasticity: A prospective, observational study

INTRODUCTION

Spasticity is common after a stroke and is an independent risk factor for developing pain. BotulinumtoxinA injection is the treatment of choice for focal spasticity. We examined the effect of intramuscular botulinumtoxinA on pain relief in patients in routine clinical practice who were experiencing pain as a primary complaint associated with post-stroke lower limb spasticity.

METHODS

Prospective, multicentre, post-marketing observational study. The study period was 16 months. The primary effectiveness variable was the mean change from baseline on the pain 0-10 Numerical Rating Scale after four botulinumtoxinA injection cycles. Secondary endpoints included changes from baseline on the pain 0-100 Visual Analogue Scale, Goal Attainment Scale, modified Ashworth Scale, 10-Meter Walk Test, Penn Spasm Frequency Scale, and 36-item Short-Form Health Survey.

RESULTS

Of 186 enrolled patients, 180 (96.8%) received botulinumtoxinA at least once. The mean (standard deviation) pain 0-10 Numerical Rating Scale score decreased significantly (p<0.0001) from 4.9 (2.2) at baseline to 2.5 (2.1) at study end, representing a 50% decrease in pain severity. Relief of pain due to spasticity was supported by improvement from baseline in all secondary variables except the 10-Meter Walk Test. Two adverse events (erysipelas and phlebitis) in one patient were considered likely to be related to botulinumtoxinA injection.

CONCLUSION

BotulinumtoxinA appears to provide pain relief as an additional benefit of local treatment in patients with post-stroke lower limb spasticity for whom pain relief is a primary therapeutic goal (a Lay Abstract has been provided as Appendix A).

Combined rehabilitation therapy with botulinum toxin to the upper limbs for acute spinal cord injury: A case report

INTRODUCTION

Patients with spinal cord injury (SCI) and incomplete paralysis may experience muscle immobilization due to functional impairment of agonist and antagonist muscles. This can induce spasticity and pain, with the risk of contracture increasing as the period of immobilization increases. This could be aggravated by pain, which interferes with rehabilitation. There is no established treatment for pain and joint contractures caused by acute SCI. Botulinum therapy plays a role in relieving muscle tension. Here, we report a case of acute SCI in which botulinum therapy was administered.

CASE PRESENTATION

The patient experienced a C5-cervical SCI due to a road traffic accident, with marked paralysis in the upper and lower limbs below the C5 level. The patient had persistent elbow flexion since the SCI and complained of excruciating pain, making adequate rehabilitation difficult. Botulinum toxin was administered to the biceps and brachialis muscles 15 days after the SCI. After administration, the patient experienced a reduction in pain with relaxation of the elbow flexor muscles, and rehabilitation treatment was resumed. This patient's contracture did not worsen, his pain decreased, and he was able to initiate self-feeding training.

DISCUSSION

In this case, occupational and physical therapy was administered with botulinum therapy. Together, they successfully reduced pain. Botulinum therapy provides analgesia and muscle relaxation and may lead to functional recovery, and we believe that treatment can be considered even in the acute phase.

Functional outcomes following surgery for spastic hip adductor muscles in ambulatory and non-ambulatory adults

OBJECTIVE

To evaluate functional outcomes of surgery of spastic hip adductor muscles (obturator neurotomy with or without adductor longus tenotomy) in ambulatory and non-ambulatory patients, using preoperatively defined personalized goals.

DESIGN

Retrospective observational descriptive study.

PATIENTS

Twenty-three patients with adductor spasticity who underwent obturator neurotomy between May 2016 and May 2021 at the Clinique des Cèdres, Cornebarrieu, France, were included.

METHODS

Postoperative functional results were evaluated in accordance with the Goal Attainment Scaling method. Patients were considered "responders" if their score was ≥ 0. Secondary outcomes included spasticity, strength, hip range of motion and change in ambulatory capacity. When data were available, a comparison of pre- and postoperative 3-dimensional instrumented gait analysis was also performed.

RESULTS

Among the 23 patients only 3 were non-walkers. Seventeen/22 patients achieved their main goal and 14/23 patients achieved all their goals. Results were broadly similar for both walking goals (inter-knee contact, inter-feet contact, fluidity, walking perimeter, toe drag) and non-walking goals (intimacy, transfer, pain, posture, dressing).

CONCLUSION

Surgery of spastic hip adductor muscles results in functional improvement in ambulation, hygiene, dressing and posture and can be offered to patients with troublesome adductor overactivity. The use of a motor nerve block is recommended to define relevant goals before the surgery.

Effects of vibration therapy for post-stroke spasticity: a systematic review and meta-analysis of randomized controlled trials

BACKGROUND

The efficacy of vibration therapy (VT) in people with post-stroke spasticity (PSS) remains uncertain. This study aims to conduct a comprehensive meta-analysis to assess the effectiveness of VT in PSS.

METHODS

PubMed, Embase, Cochrane Library, Physiotherapy Evidence Database, and Web of Science were searched from inception to October 2022 for randomized controlled trials (RCTs) of VT in people with PSS. The primary outcome was spasticity, and secondary outcomes included pain, motor function, gait performance, and adverse events. A meta‑analysis was performed by pooling the standardized mean difference (SMD) with 95% confidence intervals (CI).

RESULTS

A total of 12 studies met the inclusion criteria. Overall, VT had significant effects on reducing spasticity (SMD = - 0.77, 95% CI - 1.17 to - 0.36, P < 0.01) and pain (SMD =  - 1.09, 95% CI - 1.74 to - 0.45, P < 0.01), and improving motor function (SMD = 0.42, 95% CI 0.21 to 0.64, P < 0.01) in people with PSS. However, VT had no significant effect on gait performance (SMD =  - 0.23, 95% CI - 0.56-0.10). In addition, subgroup differences in short-term anti-spasticity effects between different vibration subtypes, vibration frequencies, vibration durations, frequency of sessions, control therapy, spasticity distribution, and population classification were not significant.

CONCLUSION

We found that VT significantly alleviated spasticity and pain in people with PSS and improved motor function, but its effect on gait performance was unclear. However, further studies are needed to validate these findings.

Botulinum Toxin Intervention in Cerebral Palsy-Induced Spasticity Management: Projected and Contradictory Effects on Skeletal Muscles

Spasticity, following the neurological disorder of cerebral palsy (CP), describes a pathological condition, the central feature of which is involuntary and prolonged muscle contraction. The persistent resistance of spastic muscles to stretching is often followed by structural and mechanical changes in musculature. This leads to functional limitations at the respective joint. Focal injection of botulinum toxin type-A (BTX-A) is effectively used to manage spasticity and improve the quality of life of the patients. By blocking acetylcholine release at the neuromuscular junction and causing temporary muscle paralysis, BTX-A aims to reduce spasticity and hereby improve joint function. However, recent studies have indicated some contradictory effects such as increased muscle stiffness or a narrower range of active force production. The potential of these toxin- and atrophy-related alterations in worsening the condition of spastic muscles that are already subjected to changes should be further investigated and quantified. By focusing on the effects of BTX-A on muscle biomechanics and overall function in children with CP, this review deals with which of these goals have been achieved and to what extent, and what can await us in the future.

Intrathecal Baclofen Monotherapy and Polyanalgesia for Treating Chronic Pain in Patients with Severe Spasticity

PURPOSE OF REVIEW

Intrathecal drug delivery is a well evidenced strategy for the treatment of many chronic pain syndromes. While opioids, anesthetics, and ziconotide are the most commonly used agents, intrathecal baclofen (ITB), which is indicated to treat spasticity, is also thought to have some analgesic properties that are poorly understood. These analgesic benefits have been reported with ITB use in treating patients with central neurological disorders who suffer from severe spasticity and chronic pain. Our review aims to characterize ITB's effects on pain, function, and quality of life in patients with severe spasticity. We performed a systematic review based on the Preferred Reporting Items for Systematic Reviews and Meta Analyses (PRISMA) guidelines. The primary outcome parameters were analgesic relief and functional improvements. Secondarily, quality of life and adverse effects were also recorded.

RECENT FINDINGS

After an initial survey identified 393 studies, 20 studies met final inclusion criteria. Of these, 16 utilized ITB monotherapy and 4 utilized ITB polyanalgesia. Overall, there was a paucity of high-powered studies. Mean titrated ITB doses ranged from 140 to 627.9 μg daily. Nineteen studies reported improved pain and spasticity. Seven studies reported improved functional outcomes and quality of life. Our results show that ITB may be an effective agent in treatingfor the treatment of chronic pain in patients with severe spasticity independent of its spasmolytic effects. Although this evidence was largely derived from studies lacking clearly defined outcomes of pain relief, ITB is reasonable to consider for concurrent spasticity and pain management. Well-designed studies are still needed to characterize ITB's analgesic efficacy when used in patients with severe spasticity.

In vivo non-invasive near-infrared spectroscopy distinguishes normal, post-stroke, and botulinum toxin treated human muscles

In post-stroke hemiparesis, neural impairment alters muscle control, causing abnormal movement and posture in the affected limbs. A decrease in voluntary use of the paretic arm and flexed posture during rest also induce secondary tissue transformation in the upper limb muscles. To obtain a specific, accurate, and reproducible marker of the current biological status of muscles, we collected visible (VIS) and short-wave Infrared (SWIR) reflectance spectra in vivo using a portable spectroradiometer (350–2500 nm), which provided the spectral fingerprints of the elbow flexors and extensors. We compared the spectra for the affected and unaffected sides in 23 patients with post-stroke hemiparesis (25–87 years, 8 women) and eight healthy controls (33–87 years, 5 women). In eight patients, spectra were collected before and after botulinum toxin injection. Spectra underwent off-line preprocessing, principal component analysis, and partial least-squares discriminant analysis. Spectral fingerprints discriminated the muscle (biceps vs. triceps), neurological condition (normal vs. affected vs. unaffected), and effect of botulinum toxin treatment (before vs. 30 to 40 days vs. 110 to 120 days after injection). VIS-SWIR spectroscopy proved valuable for non-invasive assessment of optical properties in muscles, enabled more comprehensive evaluation of hemiparetic muscles, and provided optimal monitoring of the effectiveness of medication.

Reliability of shoulder muscle stiffness measurement using strain ultrasound elastography and an acoustic coupler

PURPOSE

Abnormal increases in muscle tone can be caused by various musculoskeletal disorders. The objective of this study was to evaluate intratester and intertester reliabilities in measuring the stiffness of the shoulder muscles using strain ultrasound elastography (USE) and an acoustic coupler.

METHOD

Tissue stiffness was measured in the trapezius muscle and in the supraspinatus muscle of healthy young volunteers.

RESULTS

The mean strain ratios measured by two experienced shoulder surgeons were significantly higher in the trapezius muscle than in the supraspinatus muscle (P < 0.001). Intratester reliability was rated as moderate to substantial for the trapezius muscle and substantial for the supraspinatus muscle. Intertester reliability was substantial for both muscles, with an intraclass correlation coefficient (2,1) of 0.62 [95% confidence interval (CI) 0.28-0.82] for the trapezius muscle and 0.69 (95% CI 0.40-0.86) for the supraspinatus muscle.

CONCLUSIONS

We found substantial intratester and intertester reliabilities for the trapezius and supraspinatus muscles, suggesting that USE represents a promising modality for measuring the stiffness of shoulder muscles. However, the clinical application of this method will require the development of a device that can standardize the scanning technique to further increase the reliability.

Measuring muscle tone with isokinetic dynamometer technique in stroke patients

Study aim: Increased muscle tone, a common consequence of stroke, has neural and non-neural components. Spasticity is related to the neural component. Non-neural resistance arises from passive stiffness. This study was designed to assess the feasibility of using isokinetic dynamometry to evaluate wrist flexor muscle spasticity in stroke patients.

Materials and methods: Twenty-six patients with hemiplegia in the subacute phase of stroke participated in this study. An isokinetic dynamometer was used to stretch wrist flexor muscles at four velocities of 5, 60, 120 and 180°/s on both the paretic and non-paretic sides. Peak torque at the lowest speed (5°/s) and reflex torque at the three higher speeds were quantified. Peak torque at the lowest speed was attributed to the non-neural component of muscle tone, and was subtracted from the torque response at higher velocities to estimate reflex torque (spasticity). Data from the two sides were compared.

Results: There was no significant difference in peak torque between the paretic (2.47 ± 0.22 N·m) and non-paretic side (2.41 ± 0.28 N·m) at the lowest velocity of 5°/s (p=0.408). However, compared to the non-paretic side, the paretic side showed higher reflex torque (p<0001), and reflex torque increased rapidly with increasing velocity (p < 0.05).

Conclusion: The isokinetic dynamometer distinguished spasticity from the non-neural component and showed higher reflex torque on the paretic side compared to the non-paretic side. This instrument is potentially useful to assess the efficacy of therapeutic interventions aimed at modifying spasticity.

The efficacy of botulinum toxin A lower limb injections in addition to physiotherapy approaches in children with cerebral palsy: A systematic review

BACKGROUND

To assess treatment effect of lower limb botulinum toxin type A (BTX-A) in combination with physiotherapy approaches on gross motor functions in children with cerebral palsy compared with only physiotherapy treatment.

OBJECTIVE

The purpose of this review was to analyze the efficacy botulinum toxin a lower limb injections in addition to physiotherapy approaches in children with cerebral palsy.

METHODS

A literature search was conducted in the following databases: Cochrane, PEDro, PubMed, MEDLINE, AMED and EMBASE. The searches were limited to the period from July 2009 to July 2015. The intervention had to contain BTX-A into the lower limb plus physiotherapy approaches and be compared with only physiotherapy. The methodological quality and clinical relevance were independently assessed by the authors.

RESULTS

The database search resulted in a total of 1521 studies, of which 4 (Level II of evidence) trials were included in this review. The population represented by were age between from 11 month to 15 years. Overall there were 153 children all diagnosed with CP (87 Male, 66 Female).

CONCLUSIONS

The use of BTX-A injections in addition to physiotherapy approaches seems to have positive effect on spasticity and ROM. However, the question of whether the treatment of BTX-A plus physiotherapy has a greater improvement on functional capacity, such as gross motor function or gait parameter than only physiotherapy treatments, was inconclusive. Further investigation by rigorous studies is required.

Early predictors of developing problematic spasticity following traumatic spinal cord injury: A prospective cohort study

Objective: To identify early predictors and develop reliable, validated prediction models for development of problematic spasticity after traumatic spinal cord injury (SCI).Design: Prospective cohort study of the Rick Hansen Spinal Cord Injury Registry (RHSCIR), retrospective review of inpatient medical charts.Setting: Quaternary trauma center, rehabilitation center, community settings.Participants: Individuals with traumatic SCI between March 1, 2005, and March 31, 2014, prospectively enrolled in the Vancouver site RHSCIR.Interventions: None.Main Outcome Measure: Spasticity limiting function or requiring treatment (problematic spasticity) on the Spinal Cord Injury Health Questionnaire.Results: In 350 patients, variables documented during hospitalization that predicted the development of problematic spasticity up to 5 years post-injury included: initial Glasgow Coma Scale; age at time of injury; admission to rehabilitation center; community discharge anti-spasticity medication prescription, neurological status, Penn Spasm Frequency Scale, and pain interference with quality of life, sleep, activities; greater change in AIS motor scores between admission and discharge. The predictive models had area under the receiver operating characteristic curve of 0.80 (95% CI 0.75, 0.85) in the development set (N = 244) and 0.84 (95% CI 0.74, 0.92) in the validation set (N = 106) for spasticity limiting function and 0.81 (95% CI 0.76, 0.85) in the development set and 0.85 (95% CI 0.77, 0.92) in the validation set for spasticity requiring treatment.Conclusions: Our prediction models provide an early prognosis of risk of developing problematic spasticity after traumatic SCI, which can be used to improve clinical spasticity management and assist research (e.g. risk stratification in interventional trials).

Evidence-based position paper on Physical and Rehabilitation Medicine professional practice for Adults with Acquired Brain Injury. The European PRM position (UEMS PRM Section)

BACKGROUND

Acquired brain injury (ABI) is damage to the brain that occurs after birth caused either by a traumatic or by a nontraumatic injury. The rehabilitation process following ABI should be performed by a multi-professional team, working in an interdisciplinary way, with the aim of organizing a comprehensive and holistic approach to persons with every severity of ABI. This Evidence Based Position Paper represents the official position of the European Union through the UEMS Physical and Rehabilitation Medicine (PRM) Section and designates the professional role of PRM physicians for people with ABI. The aim was to formulate recommendations on the PRM physician's professional practice for persons with ABI in order to promote their functioning and enhance quality of life.

METHODS

This paper has been developed according to the methodology defined by the Professional Practice Committee of the UEMS-PRM Section: a systematic literature search has been performed in PubMed and Core Clinical Journals. On the basis of the selected papers, recommendations have been made as a result of five Delphi rounds.

RESULTS

The literature review as well as thirty-one recommendations are presented.

CONCLUSIONS

The expert consensus is that structured, comprehensive and holistic rehabilitation program delivered by the multi-professional team, working in an interdisciplinary way, with the leadership and coordination of the PRM physician, is likely to be effective, especially for those with severe disability after brain injury.

Treatment patterns of in-patient spasticity medication use after traumatic spinal cord injury: a prospective cohort study

STUDY DESIGN

Prospective cohort study using the Rick Hansen SCI Registry (RHSCIR) and retrospective medical chart review.

OBJECTIVE

To describe treatment patterns of in-patient anti-spasticity medication use following traumatic spinal cord injury (SCI) in acute and rehabilitation hospital settings in British Columbia, Canada.

SETTING

Quaternary trauma center, rehabilitation center.

METHODS

Individuals with traumatic SCI between 2005 and 2014 enrolled in the Vancouver RHSCIR site (N = 917) were eligible for inclusion. Oral and injectable anti-spasticity medication use were the main outcome measures.

RESULTS

In 769 participants, higher neurological level and injury severity were associated with in-patient anti-spasticity medication use (p < 0.001 for both). Of individuals with cervical and thoracic injuries (n = 589), 37% were prescribed anti-spasticity medication during hospital admission. Baclofen was the most commonly used first line oral therapy. Mean (SD) and median time from injury to Baclofen initiation was 70 (69) and 50 days, respectively. The probability of having initiated an in-patient anti-spasticity medication was 55% (95% CI (49, 60)) for individuals 6 months post-injury, and 71% (95% CI (62, 79)) for individuals 12 months post-injury. At community discharge, the prevalence of oral and injectable anti-spasticity medication use was 26 and 5%. Practice patterns of anti-spasticity medication use (2005-2009 vs. 2010-2014) have not changed significantly over time.

CONCLUSIONS

This is the first large prospective cohort study of in-patient anti-spasticity medication use following traumatic SCI. Results from our study inform clinicians and individuals of "real world" anti-spasticity medication use among individuals with traumatic SCI and may help guide care for this population in the community.

Spasticity Management in Disorders of Consciousness

Background: Spasticity is a motor disorder frequently encountered after a lesion involving the central nervous system. It is hypothesized to arise from an anarchic reorganization of the pyramidal and parapyramidal fibers and leads to hypertonia and hyperreflexia of the affected muscular groups. While this symptom and its management is well-known in patients suffering from stroke, multiple sclerosis or spinal cord lesion, little is known regarding its appropriate management in patients presenting disorders of consciousness after brain damage. Objectives: Our aim was to review the occurrence of spasticity in patients with disorders of consciousness and the therapeutic interventions used to treat it. Methods: We conducted a systematic review using the PubMed online database. It returned 157 articles. After applying our inclusion criteria (i.e., studies about patients in coma, unresponsive wakefulness syndrome or minimally conscious state, with spasticity objectively reported as a primary or secondary outcome), 18 studies were fully reviewed. Results: The prevalence of spasticity in patients with disorders of consciousness ranged from 59% to 89%. Current treatment options include intrathecal baclofen and soft splints. Several treatment options still need further investigation; including acupuncture, botulin toxin or cortical activation by thalamic stimulation. Conclusion: The small number of articles available in the current literature highlights that spasticity is poorly studied in patients with disorders of consciousness although it is one of the most common motor disorders. While treatments such as intrathecal baclofen and soft splints seem effective, large randomized controlled trials have to be done and new therapeutic options should be explored.

Shear wave velocity measurement of upper trapezius muscle by color Doppler shear wave imaging

PURPOSE

Skeletal muscle stiffness is thought to be the result of increased tissue hardness, but measurement accuracy has been dependent on operator technique. We have proposed a novel shear wave real-time imaging method (color Doppler shear wave imaging: CD SWI) with continuous shear waves excited from the tissue surface by a mechanical vibrator.

METHODS

Using the method, shear wave velocity was measured for the upper trapezius muscle. Adaptive shear wave velocity measurement by means of quality estimation of shear wave wavefront was adopted. We recruited 23 male volunteers with no history of orthopedic disease and recorded shear wave propagation to assess the intra- and inter-observer reliability. For intra-observer reliability, one observer took two measurements separated by a time delay, and the intra-class correlation coefficient (ICC) was calculated (1,1). For inter-observer reliability, ICC (2,1) was calculated from both observers' measurements.

RESULTS

Mean propagation speed was 3.75 ± 0.47 (first) and 3.71 ± 0.49 m/s (second) for Observer A (ICC (1,1) = 0.91 [95% CI 0.76-0.96]) and 3.80 ± 0.53 m/s for Observer B (ICC (2,1) = 0.83 [95% CI 0.56-0.94]).

CONCLUSIONS

This result suggests that our technique is satisfactorily reliable and has potential for future application in various fields, such as evaluation of muscle condition or the effects of rehabilitation.

Botulinum Neurotoxins: Biology, Pharmacology, and Toxicology

The study of botulinum neurotoxins (BoNT) is rapidly progressing in many aspects. Novel BoNTs are being discovered owing to next generation sequencing, but their biologic and pharmacological properties remain largely unknown. The molecular structure of the large protein complexes that the toxin forms with accessory proteins, which are included in some BoNT type A1 and B1 pharmacological preparations, have been determined. By far the largest effort has been dedicated to the testing and validation of BoNTs as therapeutic agents in an ever increasing number of applications, including pain therapy. BoNT type A1 has been also exploited in a variety of cosmetic treatments, alone or in combination with other agents, and this specific market has reached the size of the one dedicated to the treatment of medical syndromes. The pharmacological properties and mode of action of BoNTs have shed light on general principles of neuronal transport and protein-protein interactions and are stimulating basic science studies. Moreover, the wide array of BoNTs discovered and to be discovered and the production of recombinant BoNTs endowed with specific properties suggest novel uses in therapeutics with increasing disease/symptom specifity. These recent developments are reviewed here to provide an updated picture of the biologic mechanism of action of BoNTs, of their increasing use in pharmacology and in cosmetics, and of their toxicology.

OnabotulinumtoxinA Improves Pain in Patients With Post-Stroke Spasticity: Findings From a Randomized, Double-Blind, Placebo-Controlled Trial

CONTEXT

Patients with post-stroke spasticity (PSS) commonly experience pain in affected limbs, which may impact quality of life.

OBJECTIVES

To assess onabotulinumtoxinA for pain in patients with PSS from the BOTOX(®) Economic Spasticity Trial, a multicenter, randomized, double-blind, placebo-controlled trial.

METHODS

Patients with PSS (N = 273) were randomized to 22- to 34-week double-blind treatment with onabotulinumtoxinA + standard care (SC) or placebo injection + SC and were eligible to receive open-label onabotulinumtoxinA up to 52 weeks. Assessments included change from baseline on the 11-point pain numeric rating scale, proportion of patients with baseline pain ≥4 achieving ≥30% and ≥50% improvement in pain, and pain interference with work at Week 12, end of double-blind treatment, and Week 52.

RESULTS

At baseline, most patients (74.3%) experienced pain and 47.4% had pain ≥4 (pain subgroup). Mean pain reduction from baseline at Week 12 was significantly greater with onabotulinumtoxinA + SC (-0.77, 95% CI -1.14 to -0.40) than placebo + SC (-0.13, 95% CI -0.51 to 0.24; P < 0.05). Higher proportions of patients in the pain subgroup achieved ≥30% and ≥50% reductions in pain at Week 12 with onabotulinumtoxinA + SC (53.7% and 37.0%, respectively) compared with placebo (28.8% and 18.6%, respectively; P < 0.05). Reductions in pain were sustained through Week 52. Compared with placebo + SC, onabotulinumtoxinA consistently reduced pain interference with work.

CONCLUSION

This is the first randomized, placebo-controlled trial demonstrating statistically significant and clinically meaningful reductions in pain and pain interference with work with onabotulinumtoxinA in patients with PSS.

Optimizing the Management of Disabling Spasticity Following Spinal Cord Damage: The Ability Network-An International Initiative

Optimizing the treatment of disabling spasticity in persons with spinal cord damage is hampered by a lack of consensus regarding the use of acceptable definitions of spasticity and disabling spasticity, and the relative absence of decision tools such as clinical guidelines and concise algorithms to support decision-making within the broader clinical community. Many people with spinal cord damage are managed outside specialist centers, and variations in practice result in unequal access to best practice despite equal need. In order to address these issues, the Ability Network-an international panel of clinical experts-was initiated to develop management algorithms to guide and standardize the assessment, treatment, and evaluation of outcomes of persons with spinal cord damage and disabling spasticity. To achieve this, consensus was sought on common definitions through facilitated, in-person meetings. To guide patient selection, an in-depth review of the available tools was performed and expert consensus sought to develop an appropriate instrument. Literature reviews are guiding the selection and development of tools to evaluate treatment outcomes (body functions, activity, participation, quality of life) as perceived by people with spinal cord damage and disabling spasticity, and their caregivers and clinicians. Using this approach, the Ability Network aims to facilitate treatment decisions that take into account the following: the impact of disabling spasticity on health status, patient preferences, treatment goals, tolerance for adverse events, and in cases of totally dependent persons, caregiver burden.

Cost-effectiveness of Intrathecal Baclofen Therapy in severe refractory non-focal disabling spasticity: a Spanish hospital perspective

BACKGROUND

Current knowledge about long-term economic consequences of Intrathecal Baclofen Therapy (ITB Therapy®) is incomplete.

METHODS

A markov model was developed to estimate long-term clinical and economic outcomes with ITB Therapy® and conventional medical management of severe refractory non-focal disabling spasticity. Clinical and cost inputs were obtained through a non-interventional, prospective, observational study in a Spanish neurorehabilitation hospital.

RESULTS

ITB Therapy® increased remaining lifetime costs by €35,605 and resulted in a gain of 1.06 quality-adjusted life-years (QALYs), thus showing an incremental cost-effectiveness ratio (ICER) of €33,619/QALY gained. In alternative scenarios, reflecting other clinical settings and management options, considerably lower ICER values were obtained. In particular, opportunities were identified to improve efficiency by setting clinically and economically sound targets for post-operation length of stay.

CONCLUSION

In the Spanish setting, ITB Therapy® resulted in an ICER close to €30,000/QALY gained; potential ways to reduce costs and further enhance efficiency can be identified.

Spasticity in multiple sclerosis and role of glatiramer acetate treatment

INTRODUCTION

Spasticity is one of the most disabling and difficult-to-treat symptoms shown by patients with multiple sclerosis, who often show a suboptimal and unsatisfactory response to classic treatment and new available nonpharmacological alternatives. Due to the progressive nature of this condition, the early management should be essential to improve long-term outcomes.

METHODS

We performed a narrative literature review of the contribution of spasticity to the burden of multiple sclerosis and the potential role of classic disease-modifying drugs.

RESULTS

Added to the underlying pathophysiology of spasticity, certain external factors and drugs such as interferon may exacerbate the existing condition, hence their awareness is crucial as part of an effective management of spasticity. Furthermore, the evidence for the effectiveness of glatiramer acetate in preventing spasticity in naïve patients and in those switching from interferon should not be ignored.

CONCLUSIONS

This literature review proposes the examination of spasticity and the influence of classic disease-modifying agents on the level of existing condition among the variables to be considered when deciding on therapy for multiple sclerosis in clinical practice.

Early prediction of long-term upper limb spasticity after stroke: part of the SALGOT study

Objective:

To identify predictors and the optimal time point for the early prediction of the presence and severity of spasticity in the upper limb 12 months poststroke.

Methods:

In total, 117 patients in the Gothenburg area who had experienced a stroke for the first time and with documented arm paresis day 3 poststroke were consecutively included. Assessments were made at admission and at 3 and 10 days, 4 weeks, and 12 months poststroke. Upper limb spasticity in elbow flexion/extension and wrist flexion/extension was assessed with the modified Ashworth Scale (MAS). Any spasticity was regarded as MAS ≥1, and severe spasticity was regarded as MAS ≥2 in any of the muscles. Sensorimotor function, sensation, pain, and joint range of motion in the upper limb were assessed with the Fugl-Meyer assessment scale, and, together with demographic and diagnostic information, were included in both univariate and multivariate logistic regression analysis models. Seventy-six patients were included in the logistic regression analysis.

Results:

Sensorimotor function was the most important predictor both for any and severe spasticity 12 months poststroke. In addition, spasticity 4 weeks poststroke was a significant predictor for severe spasticity. The best prediction model for any spasticity was observed 10 days poststroke (85% sensitivity, 90% specificity). The best prediction model for severe spasticity was observed 4 weeks poststroke (91% sensitivity, 92% specificity).

Conclusions:

Reduced sensorimotor function was the most important predictor both for any and severe spasticity, and spasticity could be predicted with high sensitivity and specificity 10 days poststroke.

Constraint-Induced Movement Therapy After Injection of Botulinum Toxin Type A for a Patient With Chronic Stroke: One-Year Follow-up Case Report

BACKGROUND AND PURPOSE

Spasticity, an aspect of upper motor neuron syndrome, is a widespread problem in patients with stroke. To date, no study has reported the long-term (up to 1 year) outcomes of botulinum toxin (BTX) injection in combination with constraint-induced movement therapy in patients with chronic stroke. In this case report, the long-term (1 year) effects of the combination of BTX type A injection and constraint-induced movement therapy on spasticity and arm function in a patient with chronic stroke and arm paresis are described.

CASE DESCRIPTION

The patient was a 66-year-old man who had had an infarction in the right posterior limb of the internal capsule 4 years before the intervention. At screening, the patient was not able to voluntarily extend his interphalangeal or metacarpophalangeal joints beyond the 10 degrees required for constraint-induced movement therapy. From 12 days after BTX type A injection, the patient received 5 hours of constraint-induced movement therapy for 10 weekdays.

OUTCOMES

All outcome measures (Modified Ashworth Scale, Fugl-Meyer Assessment, Action Research Arm Test, and amount of use scale of the Motor Activity Log) improved substantially over the 1-year period (before intervention to 1 year after intervention). Repeat BTX type A injections were not necessary because muscle tone and arm function did not worsen during the observation period.

DISCUSSION

The improved arm function may have reflected improvements in volitional movements and coordination or speed of movements in the paretic arm as a result of a reduction in spasticity, a reduction of learned nonuse behaviors, or use-dependent plasticity after the combination of BTX type A injection and constraint-induced movement therapy. In addition, the possibility of an influence of the passage of time or the Hawthorne effect cannot be ruled out. If this approach proves useful in future controlled studies, it may reduce the rising medical costs of the treatment of stroke.

Overview of botulinum toxin as a treatment for spasticity in stroke patients

Spasticity after the occurrence of stroke induces limb deformity, functional disability and/or pain in patients, which limits their activities of daily living and deteriorates their quality of life. Botulinum toxin (BTX) has recently been reported as an efficacious therapeutic agent for the treatment of spasticity. Systematic review and meta-analysis studies have demonstrated that BTX therapy after stroke reduces spasticity and increases physical activity capacity and performance levels. Moreover, BTX can be used as an adjuvant in physiotherapy. Several studies have confirmed that the combination of BTX therapy and physiotherapy improves motor recovery. However, to date, only a few such combination studies have been conducted and their findings are considered preliminary and controversial. Therefore, future studies are required to determine the appropriate combination of treatment methods that will aid motor recovery.

Central nervous system toxicity after botulinum neurotoxin injection

Since Its first description of botulism toxicity in 1820s, specific formulations of botulinum neurotoxin (BoNT) have been introduced with different clinical benefits. However, there is increasing number of adverse events reported to Food and Drug Administration. This report presents the case of 62-year-old woman with Parkinson’s disease who received BoNT injections to treat painful spasticity in her hands. She developed severe generalized dystonia shortly after BoNT injections.

The diagnosis and management of adults with spasticity

This chapter aims to address the questions of the definition and effective management of spasticity, in order to assist the reader to recognize, assess, and treat people with this impairment. Spasticity is a physiological consequence of an insult to the brain or spinal cord, which can lead to life-threatening, disabling, and costly consequences. It is a common but not inevitable outcome of the upper motor neuron (UMN) syndrome and is characterized by muscle overactivity and high tone spasms, which, if left untreated, will lead to muscle and soft tissue contracture and limb deformity. There have been several attempts to define spasticity. The difficulty reflects the complex features of the syndrome. The most cited definition is by Lance, but does not fulfil all the clinical scenarios seen in clinical practice. The term "spasticity" in the therapeutic world covers the several other features of the UMN syndrome and, therefore, an all embracing definition is probably required as well. Rates for the prevalence of spasticity in different clinical conditions are variable. This may be due to the presence of many patients with mild spasticity, for whom little or no treatment is required for their condition. However, it is estimated that 38% of patients following stroke develop a degree of spasticity and about 19% require pharmacological treatment. Of these about one-third (5% of the total) will benefit from botulinum toxin injections for focal problems. This chapter will inform the reader about the pathophysiology of spasticity, but also includes the practicalities and principles of management, the delivery of its longer term treatments, and the utilization and measurement of relevant outcomes.

Phenol nerve block for the management of lower limb spasticity

Spasticity is defined as a motor disorder with failure to inhibit velocity-sensitive stretch reflexes leading to exaggerated muscle resistance. It is a cardinal feature of upper motor neuron lesions and can affect patients with congenital and acquired brain and spinal cord injuries of variable aetiologies (traumatic, vascular, neoplastic, and demyelination). The exact incidence and prevalence of spasticity are unknown. A consensus of experts in Britain believes it to be about 20% of stroke patients and 75% of patients with severe brain injury [1]. Spasticity varies in severity from muscle stiffness to severe, painful, and uncontrollable muscle spasms. Spasticity can be general, involving multiple limbs and trunk muscles, regional, affecting a group of muscles in one or more limbs, or focal, affecting a single muscle. Spasticity can affect the ability to feed and dress oneself, bladder and bowel control, hygiene, and mobility. It also predisposes to complications such as pressure sore formation due to poor seating / laying posture and contracture.

Obturator neurolysis using 65% alcohol for adductor muscle spasticity

Spasticity is motor alteration characterized by muscle hypertonia and hyperreflexia. It is an important complication of spinal cord injury, traumatic brain injury, cerebral palsy, and multiple sclerosis. If uncorrected, fibrosis and eventually bony deformity lock the joint into a fixed contracture. Chemical neurolysis using various agents is one of the therapeutic possibilities to alleviate spasticity. We are, hereby, reporting 3 patients in whom 65% alcohol was used as neurolytic agent for the treatment of hip adductor spasticity, and the effect lasted for a variable period.

Consequences of neurologic lesions assessed by Barthel Index after Botox(®) injection may be underestimated

Purpose

The aim of this study was to investigate whether the consequences of neurologic lesions are underestimated when the Barthel Index (BI) is used to assess the clinical outcome of botulinum toxin injection.

Patients and methods

The records for all in- and outpatients with various neurologic lesions (stroke, multiple sclerosis, spinal cord injury, traumatic brain injury, and so forth) who had been referred to the authors’ departments and who had received botulinum toxin type A (Botox^®) for spasticity within a 4-year period (2008–2011) were examined retrospectively. BI data were collected and analyzed.

Results

The BI score was found to have increased in follow-up assessments (P = 0.048). No correlation was found between the degree of spasticity and the BI score.

Conclusion

The specific injection of Botox in patients with neurologic lesions was not strongly correlated with a significant functional outcome according to the BI. The results of this study suggest that clinicians need to look at other measurement scales for the assessment of significant outcomes of Botox in the rehabilitation process after neurologic lesions.

Sonoelastographic evaluation of medial gastrocnemius muscles intrinsic stiffness after rehabilitation therapy with botulinum toxin a injection in spastic cerebral palsy

OBJECTIVE

To investigate intrinsic stiffness changes using real-time sonoelastography (RTS) in the medial gastrocnemius muscle (GCM) after rehabilitation therapy with botulinum toxin type A (BTA) injection in spastic cerebral palsy (CP).

DESIGN

Prospective study using ultrasonography and RTS.

SETTING

An inpatient rehabilitation clinic.

PARTICIPANTS

Children (N=17) with spastic CP (mean age, 57±22y, age range, 26-110mo).

INTERVENTION

Rehabilitation therapy and intramuscular injection of BTA in both medial and lateral GCMs.

MAIN OUTCOME MEASURES

RTS was obtained on the medial GCM, and the elastic pattern of the medial GCM was graded from RTS 1 (purple to green: soft) to RTS 4 (red: stiff) on the basis of color-scaled RTS. RTS score, color histogram, Modified Ashworth Scale (MAS) score of the ankle plantar flexor muscles, and Gross Motor Function Measure (GMFM) score were obtained before intervention and 4 weeks after intervention. The correlations among RTS score, GMFM, and MAS score were determined. Intrarater reliability was also evaluated.

RESULTS

Before and at 4 weeks after intervention, the mean RTS score decreased from 3.4 to 1.5 (P<.05), median red pixel intensity decreased from 112.5 to 101.3 (P<.05), median blue pixel intensity increased from 82.6 to 90.4 (P<.05), mean MAS score of the ankle decreased from 2.7 to 1.3 (P<.05), and mean GMFM score increased from 54.55% to 62.32%. Significant correlations were observed between the RTS score and the MAS score. Intrarater reliability was high.

CONCLUSIONS

Our results suggest that more information about the change of spastic muscle in CP after rehabilitation treatment with BTA may be gained by estimating muscle stiffness using RTS combined with clinical scale measurements.

Spasticity

Treatment of spasticity requires a team approach, including the patient and caregivers, therapists, physicians, and surgeons. The team needs to determine what component of the spasticity interferes with function. Traditional therapy continues to dominate the therapy provided to patients who are living with spasticity. Treatment of increased tone must be part of the overall treatment plan for the patient. The plan may also include physical and occupational therapy, oral medication, injections of botulinum toxin, use of an intrathecal baclofen pump, or surgery. For patients with limited improvement from therapy, injections of botulinum toxin are often first-line treatment for focal spasticity involving overactive muscle groups. Botulinum toxin is safe when used at recommended doses and has limited side effects. The benefits of oral medications in patients with focal spasticity may be limited by adverse effects at higher doses. Refractory spasticity may be treated with intrathecal baclofen. Surgery is reserved for patients in whom the other modalities fail to provide meaningful improvement. Continued communication from all members of the team can assure the best spasticity management plan for the individual patient, but patients need to have realistic expectations about outcome.

Botulinum toxin type A in post-stroke upper limb spasticity

OBJECTIVE

To evaluate the efficacy and safety of one-time injections of botulinum toxin type A (BoNTA) in Japanese patients with post-stroke upper limb spasticity.

RESEARCH DESIGN AND METHODS

In a multicentre, randomised, double-blind, parallel-group, placebo-controlled study, 109 patients with upper limb spasticity were randomised to receive a single treatment with lower-dose (120-150 U) or higher-dose (200-240 U) BoNTA or placebo into upper limb muscles.

CLINICAL TRIAL REGISTRATION

NCT00460564.

MAIN OUTCOME MEASURES

The tone of the wrist flexor was assessed at baseline and at weeks 0, 1, 4, 6, 8 and 12 using the Modified Ashworth Scale (MAS) for wrist, finger, thumb and disability in activities of daily living (ADL) was rated using the 4-point Disability Assessment Scale (DAS). The primary endpoint was area under the curve (AUC) of the change from baseline in the MAS wrist score in the higher-dose groups.

RESULTS

Subjects were randomised with 51 in the higher BoNTA group, 26 in the higher-dose placebo group, 21 in the lower BoNTA group and 11 in the lower-dose placebo group. Significant improvement in spasticity with higher-dose BoNTA was demonstrated by a mean difference in the AUC of the change from baseline in the MAS wrist score between the higher-dose BoNTA group and the higher-dose placebo group of -6.830 (p < 0.001, t-test), no significant different was demonstrated between the lower-dose BoNTA group and the lower-dose placebo group (p = 0.215, t-test). Significant improvements with higher-dose BoNTA were also observed in the DAS scores for limb position (p = 0.001-0.022) at all time points and dressing (p = 0.018-0.038, Wilcoxon test) at weeks 6, 8 and 12. No clinically relevant difference was noted in the frequency of treatment-related adverse events between BoNTA-treated and placebo-treated patients. The long-term efficacy and safety, and the effects on rehabilitation of BoNTA on upper limb will be evaluated using the data obtained in the open-label phase.

CONCLUSIONS

Higher-dose BoNTA reduced spasticity in upper limb muscles and improved ADL performance in terms of limb position and dressing. BoNTA is safe and effective in the treatment of post-stroke upper limb spasticity.

Does low-dose botulinum toxin help the recovery of arm function when given early after stroke? A phase II randomized controlled pilot study to estimate effect size

Objective: Spasticity after stroke may be associated with worse functional outcome. Our study aim is to establish whether a low dose of botulinum toxin, given early post stroke before clinically evident spasticity warrants treatment, will improve recovery of arm function.

Design: A double-blind randomized placebo-controlled trial.

Setting: An acute stroke unit.

Subjects: Individuals recruited within three weeks of stroke onset with severe arm function deficits.

Interventions: Injections of quarter and half standard dose botulinum toxin A to the upper limb, with a control of normal saline injections.

Main measures: Arm function, active and passive movement, and spasticity at elbow and wrist were recorded at baseline, and at 4, 8, 12 and 20 weeks post intervention. A pre-planned subgroup analysis included only subjects with no arm function at baseline (Action Research Arm Test score = 0).

Results: Thirty subjects were recruited, and 21 completed all assessments. Arm function scores improved in all three groups between baseline and week 20. There was no benefit for active treatment over control in the whole group analysis. In the subgroup analysis the active groups improved when compared with the control group and effect sizes for improvement in this subgroup were 0.6 and 0.5 for the quarter dose and half dose groups respectively.

Conclusions: Individuals with no arm function within three weeks of stroke may benefit functionally from botulinum toxin. Using the effect size of 0.5, further studies would need a minimum of 101 participants in each group to confirm this finding.

Botulinum toxin type A in post-stroke lower limb spasticity: a multicenter, double-blind, placebo-controlled trial

Lower limb spasticity in post-stroke patients can impair ambulation and reduces activities of daily living (ADL) performance of patients. Botulinum toxin type A (BoNTA) has been shown effective for upper limb spasticity. This study assesses the treatment of lower limb spasticity in a large placebo-controlled clinical trial. In this multicenter, randomized, double-blind, parallel-group, placebo-controlled study, we evaluate the efficacy and safety of one-time injections of botulinum toxin type A (BoNTA) in Japanese patients with post-stroke lower limb spasticity. One hundred twenty patients with lower limb spasticity were randomized to a single treatment with BoNTA 300 U or placebo. The tone of the ankle flexor was assessed at baseline and through 12 weeks using the Modified Ashworth Scale (MAS). Gait pattern and speed of gait were also assessed. The primary endpoint was area under the curve (AUC) of the change from baseline in the MAS ankle score. Significant improvement in spasticity with BoNTA 300 U was demonstrated by a mean difference in the AUC of the change from baseline in the MAS ankle score between the BoNTA and placebo groups (-3.428; 95% CIs, -5.841 to -1.016; p = 0.006; t test). A significantly greater decrease from baseline in the MAS ankle score was noted at weeks 4, 6 and 8 in the BoNTA group compared to the placebo group (p < 0.001). Significant improvement in the Clinicians Global Impression was noted by the investigator at weeks 4, 6 and 8 (p = 0.016-0.048, Wilcoxon test), but not by the patient or physical/occupational therapist. Assessments of gait pattern using the Physician's Rating Scale and speed of gait revealed no significant treatment differences but showed a tendency towards improvement with BoNTA. No marked difference was noted in the frequency of treatment-related adverse events between BoNTA and placebo groups. This was the first large-scale trial to indicate that BoNTA significantly reduced spasticity in lower limb muscles.

Neurolytic phenol blockade of the obturator nerve for severe adductor spasticity

BACKGROUND

In this study, we present the 3-month follow-up results of a retrospective analysis of obturator nerve (ON) phenol neurolysis performed between 2000 and 2007 in patients with adductor spasticity.

METHODS

The study was performed by retrospective investigation of the clinical follow-up results of 80 ON phenol treatments in 62 patients. Neurolysis using 5-10 ml 6% phenol was applied with the guidance of fluoroscopy and a peripheral nerve stimulator. Pain, spasticity and hygiene were evaluated and the hip abduction range of motion (ROM) was measured at the end of the first week and in the first, second and third months following the intervention.

RESULTS

The visual analogue scale scores decreased significantly in the first week, first month and the second month, but reached their initial values in the third month. A drastic increase in the ROM values was shown in hip abduction in the first week, first month and second month. An increase in the Ashworth Scale values was observed in the second and third months, but they did not reach their initial values. The hygiene score decreased drastically in the first week and the first and second months, but worsened in the third month. The success rate in nerve localization during ON neurolysis was 100%.

CONCLUSION

ON phenol blockade with fluoroscopy and peripheral nerve stimulator guidance in patients with adductor spasticity led to a decrease in spasticity and pain with an increase in the ROM of the hip and better hygiene with an efficacy lasting for about 3 months.

Botulinum neurotoxins for post-stroke spasticity in adults: a systematic review

The aim of this systematic review was to determine whether botulinum neurotoxin (BoNT) reduce spasticity or improve function in adult patients after stroke. Eleven double-blind randomized placebo-controlled trials met inclusion criteria. They encompassed 782 patients, 767 (98%) of whom received BoNT/A, and 15 (2%) BoNT/B. Most studies used the Ashworth scale as primary outcome measure. Differences between treated and control groups were assessed as categorical or continuous comparisons. The overall effect on upper limb spasticity was in favor of BoNT/A. A significantly higher number of patients had a reduction of upper limb spasticity at 4-week and 8-week evaluations in the treatment group compared with placebo. Mean changes in joint spasticity revealed improvement 3 to 6 weeks and 9 to 12 weeks after treatment. There were insufficient data to establish BoNT/A efficacy on lower limb spasticity or the effect of BoNT/B on the upper and lower limbs. Because of inconsistency and heterogeneity of the available data, it was not possible to perform a meta-analysis on disability and patients' reported outcomes. There was an overlapping safety profile between the treatment and the placebo groups. BoNT/A reduces upper limb spasticity in patients post-stroke, but the improvement in functional ability remains to be established. This gap needs to be filled by new studies to assess the effect of BoNT in the context of multidisciplinary patient management.

Cost-effectiveness modeling of intrathecal baclofen therapy versus other interventions for disabling spasticity

OBJECTIVE

To assess by simulation the cost-effectiveness of intrathecal baclofen (ITB) therapy compared with conventional medical treatments for patients with disabling spasticity and functional dependence caused by any neurological disease.

METHODS

Two models were created to simulate therapeutic strategies for managing severe spasticity, one with and one without the use of ITB, to assess various treatment sequences over 2 years based on current medical practices in France. Successful treatment at each evaluation was defined as a combination of: (1) the increased patient and caregiver satisfaction as assessed by goal attainment scaling (GAS), and (2) a decrease of at least 1 point on the Ashworth score. Probabilistic sensitivity analyses were performed using 5000 Monte-Carlo simulations taking into account specific distribution curves for direct costs and effectiveness parameters in each treatment option.

RESULTS

The model simulations suggest that including ITB as a first option strategy in the management of function of severely impaired patients with disabling spasticity results in a higher success rate (78.7% vs 59.3%; P < .001). In addition, the ITB therapy model revealed a lower cost (pound 59,391 vs pound 88,272; P < .001) and an overall more favorable cost-effectiveness ratio (pound 75,204/success vs pound 148,822/success; P < .001), compared with conventional medical management without ITB.

CONCLUSION

Within the assumptions of our modeling, ITB therapy evaluated by a combination of treatment success criteria at 6-month intervals over a 2-year period may be a cost-effective strategy compared to conventional medical management alone.

Mental techniques during manual stretching in spasticity — a pilot randomized controlled trial

Objective: To evaluate the feasibility and effects of using motor imagery during therapeutic stretching in individuals with spasticity.

Design: Randomized single-blind controlled pilot trial.

Setting: Chronic day care unit, neurological rehabilitation unit and in the community.

Subjects: Eleven individuals with spasticity in the arm requiring stretching as part of their normal routine.

Interventions: In addition to their normal stretching routine, subjects in the experimental group received motor imagery during their stretches (n = 6). The control group received progressive muscle relaxation during their stretches (n = 5). The dose varied between 8 and 56 sessions over eight weeks.

Main measures: Resistance to passive movement, measured with a torque transducer, passive range of movement, measured with an electro-goniometer, Modified Ashworth Scale (MAS) and level of discomfort during the MAS were assessed at baseline and after eight weeks by an independent assessor. These measures were recorded before and after a stretch intervention on both assessments.

Results: Participants, therapists and carers tolerated the techniques well. Compliance was variable and adherence was good. Mixed ANOVA showed no difference over time and no difference between the motor imagery and progressive muscle relaxation group on the primary and secondary outcome measures (P>0.05).

Conclusions: It is feasible to use motor imagery during therapeutic stretching. Statistical power was low due to the large variability in the population and the small sample size. Post-hoc sample size calculation suggests that future studies of this subject should include at least 54 participants per group. Further research is warranted.