Can Neuromuscular Training Alter Movement Patterns

Study Overview
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Brief Summary
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A prospective randomized controlled trial will be used to evaluate the efficacy of post-operative perturbation training. 80 patients who were regular participants in activities that involve cutting, pivoting, jumping, and lateral movements prior to injury who range in age from 13-55 at the time of injury are eligible. All eligible subjects must undergo primary anterior cruciate ligament reconstruction. Using a prospective randomized design, 40 subjects who will be block randomized by sex to 40 patients who will receive 10 sessions of post-operative perturbation training in addition to standard agility and return to activity progression and forty who receive only standard agility and return to activity progression. Post-operative perturbation training will be initiated when the athlete is at least 12 weeks post-anterior cruciate ligament reconstruction, has full range of motion and achieves 80% quadriceps strength symmetry, the criteria we currently use for beginning return to activity progression.

Detailed Description
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For many years, our laboratory has been examining the functional capabilities and movement strategies of individuals who sustain anterior cruciate ligament injuries of the knee. Using a battery of clinical tests and measures with these athletes, we have learned that not all of these individuals respond similarly to injury. Some athletes, called potential copers, experience a high level of function after their injury. Rehabilitation that involves specialized training called perturbation training allows the majority of potential copers to be successful in returning to sports in the short-term. Non-copers, however, are a group of anterior cruciate ligament-injured athletes with poor knee stability during daily activities. The capability of these individuals to return to sport is limited, and anterior cruciate ligament reconstruction is typically recommended. Over the last five years, we have begun to investigate the effects of perturbation training on non-copers. Non-copers represent the majority of anterior cruciate ligament-injured athletes, and they are of great interest not only because of their distinct functional limitations, but also the large variability within this group. Abnormal movement patterns are common following anterior cruciate ligament injury, but strategies differ between potential copers and non-copers. During an activity as basic as walking, non-copers reduce the motion of the injured knee and increase the work done at the hip and ankle, perhaps in an effort to avoid knee instability. Non-copers limit the motion of the knee by activating several muscles around the knee simultaneously. So while this may be effective in stabilizing the knee in the short term, this strategy may cause altered and potentially harmful loading patterns within the knee joint. The abnormal movement and altered muscle firing patterns of anterior cruciate ligament-injured athletes are believed to be a mechanism for knee osteoarthritis. Though anterior cruciate ligament reconstruction restores knee stability, surgery does not fully address the faulty movement of these individuals. Pre-operative perturbation training is effective in improving function and normalizing knee motion in some non-copers. Perturbation training does not improve the ability of all non-copers to return to sport, suggesting other patient factors may be related to post-surgical outcomes. Women are known to be at greater risk for anterior cruciate ligament injury than men, but recently poorer outcomes in women following surgery have also been found. In response to pre-operative training, women demonstrate improved function and gait symmetry, but recover much more slowly after surgery and demonstrate abnormal patterns and knee joint loads. Persistent faulty patterns in women warrants further study and our research can help us find ways for us to address these abnormalities. This goal of this work is to determine whether perturbation training can improve knee function and reduce faulty adaptations after anterior cruciate ligament reconstruction. Specifically, the aims of this project are to investigate whether the addition of post-operative perturbation training results in lower loading, better movement patterns and better functional outcomes than standard care.

Official Title
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Can Neuromuscular Training Alter Movement Patterns After Anterior Cruciate Ligament Injury?

Conditions
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Acute Injury of Anterior Cruciate Ligament

Intervention / Treatment
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* Other: Perturbation
* Other: Control


Participation Criteria
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Eligibility Criteria
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At this time, subjects have been enrolled and we are no longer recruiting for this study. Inclusion Criteria: regular participants in activities that involve cutting, pivoting, jumping, and lateral movements prior to injury ages 13-55 at the time of injury undergo primary Anterior Cruciate Ligament reconstruction Exclusion Criteria: concomitant Grade III ligament tears osteochondral defects >1cm2 history of previous Anterior Cruciate Ligament Reconstruction or other major lower extremity injury/surgery

Ages Eligible for Study
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Minimum Age: 13 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Perturbation<br>Subjects complete the training protocol and peturbation training exercises | Other: Perturbation<br>* All subjects complete study protocol. Subjects randomized to the perturbation group will complete the additional perturbation exercises<br>* Other names: Intervention;|
| Experimental: Control<br>Subjects will complete the training protocol (including nordic hamstrings, standing squats, drop jumps, triple single leg hopping, and tuck jumps) | Other: Control<br>* Subjects will complete the study protocol (including nordic hamstrings, standing squats, drop jumps, triple single leg hopping, and tuck jumps)<br>* Other names: Intervention;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in gait patterns from baseline to completion of intervention (approximately 6 months after surgery), 1 year after anterior cruciate ligament reconstruction and 2 years after anterior cruciate ligament reconstruction | Motion analysis data of gait patterns will be collected to analyze gait movement patterns of individuals after anterior cruciate ligament reconstruction and over time. | At enrollment (baseline), After protocol intervention (approximately 6 months after surgery), 1 year after anterior cruciate ligament reconstruction, 2 year after anterior cruciate ligament reconstruction | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Quadriceps Strength |  | At enrollment (baseline), After protocol intervention (approximately 6 months after surgery),1 year after anterior cruciate ligament reconstruction, 2 years after anterior cruciate ligament reconstruction | 
| Patient reported outcomes (Knee Outcomes Survey-Activity of Daily Living Scale, Global Rating Score of Perceived Knee Function, Knee Injury and Osteoarthritis Outcome Score, International Knee Documentation Committee 2000 Subjective Knee Form) |  | At enrollment (baseline), After protocol intervention (approximately 6 months after surgery), 1 year after anterior cruciate ligament reconstruction, 2 years after anterior cruciate ligament reconstruction | 
| Single-legged hop measures |  | At enrollment (baseline), After protocol intervention (approximately 6 months after surgery), 1 year after anterior cruciate ligament reconstruction, 2 years after anterior cruciate ligament reconstruction |