Mechanisms of Manual Therapies in CAI Patients

Not Applicable

Completed

• Conditions: Ankle Inversion Sprain; Chronic Instability of Joint
• Interventions: Other: Joint Mobilization; Other: Massage

• Registration Number: NCT03418051
• Lead Sponsor: University of North Carolina, Chapel Hill

Brief Summary

ABSTRACT:

Injury associated with sport and recreation is a leading reason for physical activity cessation, which is linked with significant long-term negative consequences. Lateral ankle sprains are the most common injuries associated with physical activity and at least 40% of individuals who sprain their ankle will go on to develop chronic ankle instability (CAI), a multifaceted condition linked with life-long residual symptoms and post-traumatic ankle osteoarthritis. Our long term goal is to develop intervention strategies to decrease disability associated with acute and chronic ankle injury and prevent posttraumatic ankle osteoarthritis. Conventional rehabilitation strategies, are only moderately successful because they ignore the full spectrum of residual symptoms associated with CAI. Manual therapies such as ankle joint mobilizations and plantar massage target sensory pathways not addressed by conventional treatments and have been shown to improve patient-reported outcomes, dorsiflexion range of motion, and postural control in CAI patients. While these early results are promising, the underlying neuromuscular mechanisms of these manual therapies remain unknown. Therefore the objective of this R21 proposal is to determine the neuromuscular mechanisms underlying the improvements observed following independent ankle joint mobilization and plantar massage interventions in CAI patients. To comprehensively evaluate the neuromuscular mechanisms of the experimental treatments, baseline assessments of peripheral (ankle joint proprioception, light-touch detection thresholds, spinal (H-Reflex of the soleus and fibularis longus), and supraspinal mechanisms (cortical activation, cortical excitability, and cortical mapping, sensory organization) will be assessed. Participants will then be randomly assigned to receive ankle joint mobilizations (n=20), plantar massage (n=20), or a control intervention (n=20) which will consist of 6, 5-minute treatments over 2-weeks. Post-intervention assessments will be completed within 48-hours of the final treatment session. Separate ANOVAs will assess the effects of treatment group (ankle joint mobilization, plantar massage, control) and time (baseline, post-treatment) on peripheral, spinal, and supraspinal neuromuscular mechanisms in CAI participants. Associations among neuromuscular mechanisms and secondary measures (biomechanics and postural control) will also be assessed. The results of this investigation will elucidate multifaceted mechanisms of novel and effective manual therapies (ankle joint mobilizations and plantar massage) in those with CAI.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2018-01-24
• Study First Submitted QC: 2018-01-24
• Study First Posted: 2018-02-01
• Study Start: 2018-09-01
• Primary Completion: 2020-10-09
• Study Completion: 2020-10-09
• Status Verified: 2021-07
• Results First Submitted: 2021-07-24
• Results First Submitted QC: 2021-08-25
• Last Update Submitted: 2021-08-25
• Results First Posted: 2021-08-27
• Last Update Posted: 2021-08-27

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 60

Inclusion Criteria

Not provided

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Exclusion Criteria

Not provided

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Joint Mobilization	Joint Mobilization	Participants will receive 6, 5-minute treatment sessions over 2-weeks. Each session will consist of 2, 2-minute bouts of Grade III anterior-to-posterior talocrural joint mobilization with 1-minute between sets. Mobilizations will be large-amplitude, 1-s rhythmic oscillations from the mid- to end range of arthrokinematic motion.
Massage	Massage	Participants will receive 6, 5-minute treatment sessions over 2-weeks. Each session will consist of 2, 2-minute bouts of plantar massage bouts with 1-minute between sets. The massage will be a combination of petrissage and effleurage to the entire plantar surface.

Primary Outcome Measures

Name	Time	Method
ML COP Velocity From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	% Modulation of ML COP velocity.; First, center of pressure (COP) is calculated in the mediolateral (ML) direction \[side to side\] with eyes open and closed. COP velocity represents the average speed at which an individual's COP moves during the 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML COP Velocity that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as ML COP velocity increased when eyes were closed relative to the eyes open condition. A ML COP velocity change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the immediate post-treatment assessment.
ML COP Velocity From Baseline to Follow-Up	Baseline and 4-week Follow-Up	% Modulation of ML COP velocity.; First, center of pressure (COP) is calculated in the mediolateral (ML) direction \[side to side\] with eyes open and closed. COP velocity represents the average speed at which an individual's COP moves during the 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML COP Velocity that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as ML COP velocity increased when eyes were closed relative to the eyes open condition. A ML COP velocity change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the Follow-Up assessment.
AP COP Velocity From Baseline to Follow-up	Baseline and 4-week Follow-Up	% Modulation of AP COP velocity.; First, center of pressure (COP) is calculated in the anterioposterior (AP) direction \[front to back\] with eyes open and closed. COP velocity represents the average speed at which an individual's COP moves during the 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML COP Velocity that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as ML COP velocity increased when eyes were closed relative to the eyes open condition. A ML COP velocity change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the follow-up assessment.
AP TTB From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	% Modulation of AP Time-to-Boundary.; First, time-to-Boundary (TTB) is calculated in the anterioposterior (AP) direction \[front to back\] with eyes open and closed. TTB represents the time (s) it would take for a participant's center of pressure (i.e. vertical projection of the center of mass) to reach their base of support (i.e. boundary) based on the instantaneous position and velocity of the center of pressure. The base of support is represents the length and width of an individual's foot.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in AP TTB that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes open balance score - eyes closed balance score) / eyes open balance score. Negative scores indicate a greater reliance on visual information as AP TTB decreased with eyes closed.
95% Confidence Ellipse From Baseline to Follow-Up	Baseline and 4-week Follow-Up	% Modulation of 95% Confidence Ellipse.; First, center of pressure (COP) excursion \[movement\] is calculated and the magnitude of an ellipse that contains 95% of all data points is calculated with eyes open and closed. The resulting outcome is calculated from a 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as the variable increased when eyes were closed relative to the eyes open condition. A change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the immediate post-treatment assessment.
AP COP Velocity From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	% Modulation of AP COP velocity.; First, center of pressure (COP) is calculated in the anterioposterior (AP) direction \[front to back\]. COP velocity represents the average speed at which an individual's COP moves during the 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML COP Velocity that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as ML COP velocity increased when eyes were closed relative to the eyes open condition. A ML COP velocity change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the immediate post-treatment assessment.
ML TTB From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	% Modulation of ML Time-to-Boundary.; First, time-to-Boundary (TTB) is calculated in the mediolateral (ML) direction \[side to side\] with eyes open and closed. TTB represents the time (s) it would take for a participant's center of pressure (i.e. vertical projection of the center of mass) to reach their base of support (i.e. boundary) based on the instantaneous position and velocity of the center of pressure. The base of support is represents the length and width of an individual's foot.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML TTB that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes open balance score - eyes closed balance score) / eyes open balance score. Negative scores indicate a greater reliance on visual information as ML TTB decreased with eyes closed.
ML TTB From Baseline to Follow-Up	Baseline and 4-week Follow-Up	% Modulation of ML Time-to-Boundary.; First, time-to-Boundary (TTB) is calculated in the mediolateral (ML) direction \[side to side\] with eyes open and closed. TTB represents the time (s) it would take for a participant's center of pressure (i.e. vertical projection of the center of mass) to reach their base of support (i.e. boundary) based on the instantaneous position and velocity of the center of pressure. The base of support is represents the length and width of an individual's foot.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in ML TTB that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes open balance score - eyes closed balance score) / eyes open balance score. Negative scores indicate a greater reliance on visual information as ML TTB decreased with eyes closed.
95% Confidence Ellipse From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	% Modulation of 95% Confidence Ellipse.; First, center of pressure (COP) excursion \[movement\] is calculated and the magnitude of an ellipse that contains 95% of all data points is calculated with eyes open and closed. The resulting outcome is calculated from a 10 second single limb stance trial.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes closed balance score - eyes open balance score) / eyes open balance score. Positive scores indicate a greater reliance on visual information as the variable increased when eyes were closed relative to the eyes open condition. A change greater than the eyes open value would result in a value \>100%. This analysis focused on baseline to the immediate post-treatment assessment.
AP TTB From Baseline to Follow-Up	Baseline and 4-week Follow-Up	% Modulation of AP Time-to-Boundary.; First, time-to-Boundary is calculated in the anterioposterior (AP) direction \[front to back\] with eyes open and closed. Time-to-boundary represents the time (s) it would take for a participant's center of pressure (i.e. vertical projection of the center of mass) to reach their base of support (i.e. boundary) based on the instantaneous position and velocity of the center of pressure. The base of support is represents the length and width of an individual's foot.; Next, % modulation is calculated. This estimates the weight given to visual information during eyes open stance based on the magnitude of change in AP TTB that occurs when vision is removed relative to the eyes open condition (control condition). The following formula is used: % Modulation = (eyes open balance score - eyes closed balance score) / eyes open balance score. Negative scores indicate a greater reliance on visual information as AP TTB decreased with eyes closed.

Secondary Outcome Measures

Name	Time	Method
Plantar Flexion Joint Position Sense From Baseline to Follow-Up	Baseline and 4-week Follow-Up	Amount of error, measured in degrees, from a target angle of plantar flexion. Participants are shown a target ankle and asked to replicate that angle (i.e. joint position) with their eyes closed. The amount of error from the target angle is recorded as the joint position sense. Larger values (i.e. greater error) indicates worse joint position sense. This analysis focused on baseline to the follow-up assessment.
5th Metatarsal Light-touch Threshold From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	Minimal amount of pressure that can be detected by an individual at the base of the 5th metatarsal. Semmes-Weinstein monofilaments, of different diameters (mm), are pressed against the skin using an established 4-2-1 stepping algorithm. Higher values (thresholds) indicate worse light touch sensation thresholds. This analysis focused on baseline to the immediate post-treatment assessment.
5th Metatarsal Light-touch Threshold From Baseline to Follow-Up	Baseline and 4-week Follow Up	Minimal amount of pressure that can be detected by an individual at the base of the 5th metatarsal. Semmes-Weinstein monofilaments, of different diameters (mm), are pressed against the skin using an established 4-2-1 stepping algorithm. Higher values (thresholds) indicate worse light touch sensation thresholds. This analysis focused on baseline to the follow-up assessment.
Corticomotor Map Area From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure representing the size of a muscle's cortical representation using transcranial electromagnetic stimulation. Map area is the number of stimulus positions whose stimulation evoked an average motor evoked potential ≥ the motor evoked potential threshold. An increase would suggest an expansion of the cortical representation of a selected muscle. This analysis focused on baseline to the follow-up assessment.
Gamma Power Spectral Density From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the gamma bandwidth. This analysis focused on baseline to the follow-up assessment.
Plantar Flexion Joint Position Sense From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	Amount of error, measured in degrees, from a target angle of plantar flexion. Participants are shown a target ankle and asked to replicate that angle (i.e. joint position) with their eyes closed. The amount of error from the target angle is recorded as the joint position sense. Larger values (i.e. greater error) indicates worse joint position sense. This analysis focused on baseline to the immediate post-treatment assessment.
Soleus H:M Ratio From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	This measure shows the percentage of excited alpha motor neurons (H) within a muscle upon electrical stimulation, relative to the total number of alpha motor neurons in the same muscle (M). Higher scores represent a greater percentage of excitability (i.e. activation) and is thought to represent better function of the spinal motor pathway. This analysis focused on baseline to the immediate post-treatment assessment.; The test is performed using an electric stimulator and electromyography (EMG) to record muscle responses. Stimulation intensity is increased on sequential trials to capture both the H-wave and M-wave responses.
1st Metatarsal Light-touch Threshold From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	Minimal amount of pressure that can be detected by an individual at the head of the 1st metatarsal. Semmes-Weinstein monofilaments, of different diameters (mm), are pressed against the skin using an established 4-2-1 stepping algorithm. Higher values (thresholds) indicate worse light touch sensation thresholds. his analysis focused on baseline to the immediate post-treatment assessment.
1st Metatarsal Light-touch Threshold From Baseline to Follow-Up	Baseline and 4-week Follow-Up	Minimal amount of pressure that can be detected by an individual at the head of the 1st metatarsal. Semmes-Weinstein monofilaments, of different diameters (mm), are pressed against the skin using an established 4-2-1 stepping algorithm. Higher values (thresholds) indicate worse light touch sensation thresholds. This analysis focused on baseline to the follow-up assessment.
Corticomotor Map Volume From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure representing the size of a muscle's cortical representation using transcranial electromagnetic stimulation. Map volume will be calculated as the sum of the mean normalized MEPs recorded with an increase suggesting greater cortical excitability. This analysis focused on baseline to the immediate post-treatment assessment.
Soleus H:M Ratio From Baseline to Follow-Up	Baseline and 4-week Follow-Up	This measure shows the percentage of excited alpha motor neurons (H) within a muscle upon electrical stimulation, relative to the total number of alpha motor neurons in the same muscle (M). Higher scores represent a greater percentage of excitability (i.e. activation) and is thought to represent better function of the spinal motor pathway. This analysis focused on baseline to the immediate post-treatment assessment.; The test is performed using an electric stimulator and electromyography (EMG) to record muscle responses. Stimulation intensity is increased on sequential trials to capture both the H-wave and M-wave responses.
Fibularis Longus H:M Ratio From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	This measure shows the percentage of excited alpha motor neurons (H) within a muscle upon electrical stimulation, relative to the total number of alpha motor neurons in the same muscle (M). Higher scores represent a greater percentage of excitability (i.e. activation) and is thought to represent better function of the spinal motor pathway. This analysis focused on baseline to the immediate post-treatment assessment.; The test is performed using an electric stimulator and electromyography (EMG) to record muscle responses. Stimulation intensity is increased on sequential trials to capture both the H-wave and M-wave responses.
Fibularis Longus H:M Ratio From Baseline to Follow-Up	Baseline and 4-week Follow-Up	This measure shows the percentage of excited alpha motor neurons (H) within a muscle upon electrical stimulation, relative to the total number of alpha motor neurons in the same muscle (M). Higher scores represent a greater percentage of excitability (i.e. activation) and is thought to represent better function of the spinal motor pathway. This analysis focused on baseline to the immediate post-treatment assessment.; The test is performed using an electric stimulator and electromyography (EMG) to record muscle responses. Stimulation intensity is increased on sequential trials to capture both the H-wave and M-wave responses.
Fibularis Longus Active Motor Threshold From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure of cortical excitability using transcranial electromagnetic stimulation. A higher active motor threshold (AMT) indicates decreased excitability, as a greater stimulus intensity is required to elicit a motor evoke potential (MEP). This analysis focused on baseline to the immediate post-treatment assessment.
Fibularis Longus Active Motor Threshold From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure of cortical excitability using transcranial electromagnetic stimulation. A higher active motor threshold (AMT) indicates decreased excitability, as a greater stimulus intensity is required to elicit a motor evoke potential (MEP). This analysis focused on baseline to the immediate post-treatment assessment.
Cortical Silent Period From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure of corticospinal inhibition using transcranial electromagnetic stimulation. The cortical silent period (CSP) will be measured as the distance from the end of the motor evoked potential (MEP) to a return of the mean electromyographic (EMG) signal plus two times the standard deviation of the baseline (pre-stimulus) EMG signal. A longer CSP indicates a greater corticospinal inhibition. This analysis focused on baseline to the immediate post-treatment assessment.
Cortical Silent Period From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure of corticospinal inhibition using transcranial electromagnetic stimulation. The cortical silent period (CSP) will be measured as the distance from the end of the motor evoked potential (MEP) to a return of the mean electromyographic (EMG) signal plus two times the standard deviation of the baseline (pre-stimulus) EMG signal. A longer CSP indicates a greater corticospinal inhibition. This analysis focused on baseline to the follow-up assessment.
Corticomotor Map Area From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure representing the size of a muscle's cortical representation using transcranial electromagnetic stimulation. Map area is the number of stimulus positions whose stimulation evoked an average motor evoked potential ≥ the motor evoked potential threshold. An increase would suggest an expansion of the cortical representation of a selected muscle. This analysis focused on baseline to the immediate post-treatment assessment.
Corticomotor Map Volume From Baseline to Follow-Up	Baseline and 4-week Follow-Up	measure representing the size of a muscle's cortical representation using transcranial electromagnetic stimulation. Map volume will be calculated as the sum of the mean normalized MEPs recorded with an increase suggesting greater cortical excitability. This analysis focused on baseline to the immediate post-treatment assessment.
Alpha Power Spectral Density From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the alpha bandwidth. This analysis focused on baseline to the immediate post-treatment assessment.
Alpha Power Spectral Density From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the alpha bandwidth. This analysis focused on baseline to the immediate follow-up assessment.
Beta Power Spectral Density From Baseline to Follow-Up	Baseline and 4-week Follow-Up	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the beta bandwidth. This analysis focused on baseline to the follow-up assessment.
Gamma Power Spectral Density From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the gamma bandwidth. This analysis focused on baseline to the immediate post-treatment assessment.
Beta Power Spectral Density From Baseline to Post Intervention	Baseline and 24-72 hours post intervention	A measure of cortical activation using electroencephalography. Power spectral density (PSD) reflects the distribution of signal power over frequency (micro Volts). Higher PSDs indicate more cortical activity within the beta bandwidth. This analysis focused on baseline to the immediate post-treatment assessment.

Trial Locations

Locations (1)

Fetzer Hall; 🇺🇸 Chapel Hill, North Carolina, United States