In a previous post, I discussed the importance of closed kinetic chain testing in a baseball player. A quote from one of the original reliability studies on the Closed Kinetic Chain Upper Extremity Stability Test (Goldbeck & Davies 2000) provides additional support for the need for closed kinetic chain testing:

“Typically, in clinical practice, a measurement or test is performed to evaluate the status of a particular parameter, and then, based on the test results, appropriate intervention strategies are applied to improve the deficit. Clinicians must ask themselves why closed kinetic chain upper extremity exercises are being integrated into treatment programs when no testing has been performed to demonstrate any deficits in those areas”

So, if you are doing rehabilitation in the closed-kinetic chain, you need to test in the closed kinetic chain as well: trunk stability push up, Upper Quarter Y Balance Test, plank, CKCUEST, and one-arm hop test.

Goldbeck TG, Davies GJ. Test-retest reliability of the closed kinetic chain upper extremity stability test: a clinical field test.  J Sport Rehabil. 2000;9:35-45.

Trunk Stability Push UpY-Balance Test - Infero Lat

I spend a lot of time discussing that the Functional Movement Screen (FMS) and Selective Functional Movement Assessment (SFMA) are not intended to be sport specific or even “Functional” measures. The FMS and SFMA are used to determine if a person has the underlying movement competency to serve as the foundation for his or her activity.
So why are there age, gender, and sport/activity specific norms and risk cut points for the Y Balance Test? Isn’t that a contradiction?

When it comes to higher level testing (such as dynamic balance), there can be an activity specific balance adaptation that occurs. To see how this plays out as different norms and injury risk cut points, check out this short video

 

Move2Perform chart

 

In the last post, I discussed the importance of having a patient or athlete demonstrate that he has basic motor control competency and capacity in the closed kinetic chain. That way there are more data points to indicate that there is a solid foundation for sport specific skills. Now I will focus on selecting tests that can be used for the upper quarter. Please note, I used upper quarter versus upper extremity intentionally given the vital connection of the upper limb to the thorax.

Before listing specific tests, it is important to consider the testing order. Prior to higher level closed chain testing, there must be basic range of motion and strength. I do want to make special note of the importance of testing grip strength with hand at side, out front and full flexion and comparing bilaterally. Symmetrical grip strength in these positions indicates that the shoulder has enough stability to generate force through the hand. Try this and you might find some interesting results.

Once that is present, I feel comfortable progressing through an upper quarter testing hierarchy.

Functional Movement Screen Trunk Stability Push Up

Trunk Stability Push Up

While I don’t perform the Trunk Stability Push Up in isolation (I use all seven tests), I do feel it is important to mention it in the hierarchy of upper quarter tests. The TSPU requires symmetrical trunk stability, scapular stability, and upper extremity strength. Before advancing to higher level tests, I want to see the person score a 2. That means that from the bottom part of a push up position, the trunk comes off floor as one unit with no sag in lumbar spine (able to perform with thumbs in-line with chin (men) or with thumbs in-line with clavicle (women)).

Once this is normal, I want see that he has bilateral static stability through prone plank position for at least 10 seconds. Then I look at unilateral stability through holding the side plank for 10 seconds. Remember, I am not trying to test endurance with these tests at this point. Endurance, power, and agility come later in the testing hierarchy.

Y Balance Test – Upper Quarter

Of course, I have a bias here. I was actually resistant to creating an upper quarter test similar to the Y Balance Test for the Lower Quarter. But now, I actually appreciate the harmony of the Upper and Lower Quarter Y Balance test and I get a ton of information from both.

Y-Balance Test - Infero Lat

There are 2 published research studies (Gorman et al 2012, Westrick et al 2012) that specifically examine Y Balance Test – Upper Quarter. Both studies found the Y Balance Test – Upper Quarter to be reliable. In addition, both studies found there was no difference in YBT-UQ performance between dominant and non-dominant limbs. This indicates that YBT-UQ performance may serve as a good measure in return to sport testing when rehabilitating shoulder, upper limb, and spine injuries. Westrick et al stated:

 

“Similarity on the UQYBT between dominant and non-dominant limbs indicates that performance on this test using a non-injured UE may serve as a reasonable measure for “normal” when testing an injured UE.”

In our current research, we are also finding right/left symmetry on the YBT-UQ in professional and collegiate baseball players (including pitchers). So, I think if overhead athletes and healthy adults demonstrate symmetry on the YBT-UQ, patients should demonstrate symmetry before returning to sport/activity (or at least before discharge).

In the next post, I will go through higher level upper quarter testing.  This will cover testing for endurance, power, and agility including the 4 plank positions, one arm hop testing, and the Closed Kinetic Chain Upper Extremity Stability Test.

I am frequently asked, “What tests are available when doing return to sport testing for a baseball pitcher?” When I start to suggest some closed kinetic chain tests like the Closed Kinetic Chain Upper Extremity Stability Test and the Upper Quarter Y Balance Test, I immediately get the next question of

“Why should I test someone in the closed kinetic chain when his sport is exclusively performed in the open kinetic chain?”

OR

“Closed kinetic chain testing is not “functional” for a baseball pitcher, why do it?”

 

First, we must define the goal of testing.  Is replicating the sport or activity that the person is returning to our goal? I am not sure I have the ability or equipment needed to evaluate a baseball pitcher that moves at over 8,000 degrees per second. In order to capture that speed accurately, sophisticated (and typically time consuming and costly) biomechanical analysis is required.

Chain GroupThe problem is, even with that huge quantity of precise data, it does not tell us WHY the elbow or shoulder is in a certain position. Is it a problem with technique, or is it an underlying thoracic mobility or dynamic core stability issue? For that, I need different testing.

My goal in testing the upper quarter in the overhead athlete is to determine if the person has the fundamental mobility, stability, and motor control that is the foundation for human movement regardless of the speed. This foundation includes not only glenohumeral joint stability and scapular stability, but how that extremity integrates with the core.

Most clinicians would agree that basic range of motion and strength need to be present prior to sport. Beyond traditional goniometer and muscle testing, one of the best ways of evaluating an athlete that has adequate mobility and stability is through testing in the closed kinetic chain. If the athlete can demonstrate that he has basic motor control competency and capacity in the closed kinetic chain, I have more data points to indicate that he has a solid foundation for sport specific skills, like hurling a small projectile thousands of degrees per second.

I want to first see that he has bilateral static stability through plank and push up type positions. Then progressing to unilateral static postures like the side bridge. Ultimately, I really want to see how the person responds when challenged and deficits are typically best seen at the limit of stability.

What do you think about testing open kinetic chain athletes in the closed kinetic chain and what tests do you use? Let’s start a discussion.

The next test in our series on return to sport testing is the Star Excursion Balance Test. While many of you are familiar with the research regarding the test’s utility in predicting injury in the pre-participation setting, it seems to be less commonly implemented in return to sport testing. Remember, we are currently discharging our patients with modifiable risk factors for future injury.

Flux Capacitor from Time Traveling DeLorean from Back to the Future  Is it coincidence that it is in the shape of a Y?

Flux Capacitor from Time Traveling DeLorean from Back to the Future
Is it coincidence that it is in the shape of a Y?

So, how can the Star Excursion/Y Balance Test help us? You may have read the systematic review. But what amazes me  is that in the original paper we reviewed 36 articles extracted from 1998 to 2010, and since then over 30 additional research articles were published in 2011-13 (for a total of over 60 published articles on the Star Excursion/Y Balance Test). Here is a summary of what we know:

  • Reliable (Plisky et al 2009, Shaffer et al 2010, Gribble 2013)
  • Predictive of injury (Plisky 2006, Lehr 2013, de Naronha 2012)
  • Discriminant Validity
    • Identifies chronic ankle and ACL insufficiency (Hubbard 2007, Hertel 2006, Hale 2007, Akbari 2006, Nakagawa 2004 Gribble 2004, Olmstead 2002, Herrington 2009, Delahunt 2013)
    • Differentiates between athletes based on age, sport, gender (Plisky 2009, Thorpe & Ebersole 2008, Bressel et al 2007)
  • Improves after training (Filipa 2010, Fitzgerald 2010, Leavy 2010, Eisen 2010, McKeon 2008, Hale 2007, English 2007, Bouillon 2009, Kahle & Gribble 2009, Rasool & George 2007) even in the elderly! (Khale  et al 2013, Hosseini 2012, Sarvestani  et al 2012)
  • Improving Star Excursion Balance Test scores reduces injury risk (Steffen 2013)

There is no doubt in my mind that the Star Excursion Balance Test/Y Balance Test has the most research behind it compared to any other return to sport test. Most importantly though, it is the ONLY lower quarter test I know of that is reliable, predictive, modifiable AND improving  performance on it reduces injury risk.  Please let me know if I am missing a test that has ALL of those characteristics.

Ok, I agree I should be using Star Excursion Balance Test for return to sport, but what is considered a “passing” test?

Given that the Star Excursion/Y Balance Test is predictive of injury and that one of main goals with return to sport decision making is determining if the athlete is going to get hurt again, we should look at the studies that use the test to predict injury:

High School Basketball players (Plisky 2006)

– Players with anterior asymmetry of greater that 4 cm are at increased risk of injury

– Girls with a composite score (94%) in the bottom third of their peers are 6 times more likely to get injured

Collegiate Football Players (Lehr 2013)

– All injuries occurred in players with a composite score of less than 89% (Note that the composite risk cut point needs to be based on gender, sport, and age.)

Active College Students (de Naronha 2012)

– Posterolateral reach of less than 80% of limb length increase risk of ankle sprain. Interestingly, posterolateral reach of greater than 90% was protective of ankle sprain.

Collegiate Athletes (Lehr 2013)

– Those who had a previous injury and scored below the composite score risk cut point for their age, gender and sport OR had a greater than 4cm anterior reach asymmetry were in the high risk category

Bottom Line: Prior to return to sport (or at LEAST prior to discharge), your patients should demonstrate a symmetrical Star Excursion/Y Balance Test that is above the risk cut point for their peer group.

As we work our way through improving our return to sport testing, our first stop is at hop testing. Most rehabilitation professionals use some form of hop testing, but which hop tests should we use and what should our passing criteria be?

Which hop tests should I choose?boy hopping

While it is important to use double limb hopping as part of the progression in rehabilitation, it is unnecessary for return to sport and discharge testing. In a study by, Myer et al double limb activities did not identify the unilateral deficits found after ACL reconstruction. Here are the unilateral tests supported by research:

Single hop for distance
6m timed hop — I don’t use this one. This is not solely based on published research (although the reliability is the lowest of the hop tests), but what I have observed clinically and through studies we have done. Basically, unless you use timing gates, your stopwatch trigger finger error is pretty close to any right/left asymmetries you would find (except in the cases of severe asymmetry — which the other hop tests would pick up)
Triple hop
Triple crossover hop
Hop & Stop — I really like the concept of this one and I am starting to use it more clinically. There are normative values and you know what a big fan I am of using population specific values to determine risk. Jeremy Boone has written about the hop and stop here

The above tests are reliable and modifiable  (Munro & Herrington 2011Reid et al 2007). I have not seen any studies demonstrating the injury prediction value of these hop tests (if you do know of such studies, please let me know) but they do have decent discriminant validity.

Criteria for Discharge  and/or Return to Sport:

To me, the MOST important question is “What should the return to sport and/or discharge criteria be for hop testing?”

The most common return to sport criteria that I have come across in the literature is 85% and 90% Limb Symmetry Index (LSI). I believe neither of those is stringent enough. Remember, previous injury is the most consistently reported risk factor for future injury and we are currently discharging individuals with modifiable risk factors. So, on that basis alone, our standards should be higher.

But, let’s look at the research.  Reid et al 2007 repeated hop testing on 4 separate time points after ACL reconstruction (16 weeks, a couple times more that week, and at 24 weeks post op)  and  found good longitudinal and concurrent validity for the four hop tests.  However, consider this interesting fact from their research:

At 24 weeks post-op ACL reconstruction, the average overall Limb Symmetry Index was 88.5% and the average Lower Extremity Functional Scale score was 69.3. An athlete with a 69.3 LEFS would have moderate difficulty with the following activities

•“Your usual hobbies, recreational or sporting  activities”
•“Running on even ground”
•“Running on uneven ground”
•“Making sharp turns while running fast”
•“Hopping”

If someone reported this much difficulty with these activities (I realize this is an “average” report but their LSI report is also an “average”), should she return to sport? Bottom line: In this study, 89% hop testing LSI equates with moderate difficulty with simple sport activities. Thus, 90% is not enough. Also, just because someone has returned to sport (which is what is typically considered “success”) does not mean that she is not at substantially increased risk of injury.

Finally, Munro & Herrington 2011 found that the average LSI for the four hop tests was 100% (98.38 to 101.61%.) and that 100% of healthy subjects have at least an LSI of 90%. Based on these results, the researchers advocate that the return to sport LSI criteria be increased to 90%.

Given our current re-injury rate, I suggest hop testing LSI should at least be above 95% and recommend it to be above 97%-100%. Do you think we can achieve this in rehabilitation? Do you think we should use 90% for return to sport and 97-100% for discharge?

We’ve been discussing return to sport and discharge testing. In our last post, we met Jane, a 36 year old with knee and hip pain due to lack of systematic discharge testing after her ACL reconstruction 20 years earlier. This  left her with modifiable risk factors and now pain. Worse yet, she is trying to get into shape but is struggling due to this recent “injury.” Remember, we can prevent these injuries, but the key is systematic testing at return to sport and discharge. But before we get into the specific tests and criteria, let’s discuss how we should go about selecting those tests.

The Missing Link

Obviously, the test should be reliable and measure the domain that you are trying to test. But which domains should we test? Using a Delphi study method, Haines et al created a checklist of domains that an expert panel felt were important to include in return to sport testing. The domains that the experts suggested testing included:

      • pain
      • coordination
      • movement
      • balance
      • neuromuscular control
      • power
      • sport specific movements
      • strength and range of motion ** this is my addition (we will discuss the research related to these and risk of injury)

I think we all would agree with the above list, but how do we go about selecting the specific test and criteria for return to sport or discharge? I believe most of us already test those domains, but our current standard of care is leaving people with a substantial risk of future injury.

What are we missing?  I believe we are missing 3 key concepts in return to sport and discharge testing:

1) When possible, the tests we use should be predictive of injury

– Could you imagine if your primary care physician could do a few simple tests that could quickly give you a snapshot of your risk of a disease? Wouldn’t you expect her to perform them? As a matter of fact, they currently do (think heart rate and blood pressure). We owe this to our patients in rehabilitation as well. But when it comes to return to sport, I believe we put too much and too early emphasis on tests requiring high level physical function and other sport specific tests. While those are important, I  think we need to consider tests predictive of injury or that identify traits that lead to susceptibility to injury.

2) The tests need to be arranged in a hierarchical fashion ( This case study in BJSM is a start).

– Currently, I think we assume (often unconsciously) that if an athlete can hop/cut/run well, then they have the foundational requirements of ROM, strength,  basic movement and balance. Or, that those foundational traits are not as important. But frequently, this is not the case. There is little need to perform testing at higher levels of function if there is a fatal flaw in movement or balance at lower levels of function. If the athlete passes the higher level testing, they too ASSUME that they are good to go.

3) We need to set the minimum criteria for discharge to be near what a person at “Normal” risk would score on the test (and I would argue it should be even higher than that).

– Since we know that athletes who have been previously injured are more likely to be injured again and that motor control changes frequently remain after injury, we should demand that their test results are close to normal prior to discharge. What if you had a disease and your blood levels indicated that it was advanced and you underwent treatment and they retested your blood and found that you were better, but not normal. What would your response be? Mine would be “Is it possible to get it back to normal or is this as good as it gets?” We need to have the same attitude toward one of our largest, most expensive systems — the neuromuscular system

 So, with those concepts in mind, here is what I am now giving patients at the start of their care. This list includes most of my discharge criteria. Over the next several posts, I will go through the research regarding these tests as well as any others that are suggested. Add any tests that you think are missing below.

Not because we want to autograph our great work, but to signify that we have completed the safety checks to ensure we have removed all modifiable risk factors for injury. Why did surgeons implement signing the operative knee before surgery? As ridiculous as it sounds, the wrong knee had mistakenly been operated on. It doesn’t happen very often, but what it does, it can be catastrophic. Why should rehabilitation providers sign that they have removed all modifiable risk factors after rehabilitation?

Because we are unknowingly discharging  numerous patients with modifiable risk factors for future injury. In fact, almost certainly many more patients are being discharged with modifiable risk factors than wrong knees are being operated on — and the long-term consequences can be just as catastrophic.

Let’s hear what happened to Jane:

Jane walking with her child

Jane is a 36-years-old mother of two, whose youngest is 18 months. Since the birth of her children Jane’s priorities have shifted and she no longer gets to the gym as much as she’d like. She enjoys exercises, but with two kids and full-time job it’s hard to squeeze in a regular routine. As a result, Jane has put on few pounds, a fact that pushed her to recommit to getting back into shape despite her busy schedule.

In the course of her new workout routine, she developed hip and knee pain. She went to her physician and he diagnosed her with early onset knee osteoarthritis. How can that be, she’s only 36?

Looking back over Jane’s medical history, we discover that 20 years ago she had an ACL reconstruction, with several months of rehabilitation. Considering this prior injury, was Jane’s early onset of osteoarthritis just a natural course of the ACL tear, or was there something that could have been done differently to prevent her current condition? Let’s look at her post-operatively:

The rehabilitation provider that worked with Jane had her start with basic range of motion and strengthening and then progressed her through a myriad of exercises from low to high level. Finally, Jane was doing plyometrics (programs proven to reduce injury), running, and cutting and was ready to return to sport. Her strength and ROM looked good and so did her running and cutting. Jane said she was feeling great! So she went back to sport.

Here’s the problem: Previous injury is the most consistently reported risk factor for future injury in athletics. Here is one of my favorite injury epidemiologists summarizing his research findings:

“Looking at 70 teams, in 18 countries, over 8 seasons (9,000 injuries), we have found that previous injury is by far the greatest predictor of future injury in football.”

Jan Eckstrand
Soccer Industry Medical Symposium 2009

But what is more important is that, numerous researchers have found that modifiable risk factors remain after rehabilitation (eg. jump landing asymmetry remains 2 years after ACL reconstruction and predicts second ACL tear). If you would like to dive into that concept in more depth, check out this short video

What this means is that without standardized, systematic, and stringent return to sport and discharge testing, we are likely to discharge patients with modifiable risk factors. We MUST stop this. Since I have implemented systematic discharge and return to sport testing, I am SHOCKED to find out how frequently I am wrong — the patient appears to be normal (even by my “trained” eye) but testing reveals something completely different.

So, are you willing to sign your patient’s leg, arm or back? I am…..but in the mean time, I have to go apologize to some of my previous patients.  Fortunately, Jane is fictional but represents a large percentage of our patients.

Over the next several posts, I hope we can all discuss what the evidenced based discharge tests should be and what is considered passing. What tests do you think should be included? Post them below so we can discuss them in this forum.

So you have decided to take the plunge — you are going to try some injury prevention with a large group or team. You have already talked with the coach and have some “buy in” (if you don’t, start here). Here are 5 things that will help make your injury prevention successful:

teamwork - ants

1. Start Small – Just like dieting, small incremental steps are key to permanent success. People hear that we test 150 athletes in 2-3 hours and give real time reports of performance, risk categories, and 3 corrective exercises for each athlete. However, this didn’t happen overnight. Just like water eroding rock over time, we gradually changed our injury prevention culture over several YEARS. If you start by simply setting a goal of making your injury prevention better than it was last year, you will gradually get there. Here are a few suggestions:

      • Start with a coach you have a good relationship with and one team
      • Select one or two tests to do (see below)
      • Ask injury history questions
      • Work with the individuals who had pain with testing
      • Be sure to retest those individuals to ensure the risk factors have normalized.

2. Categorize to maximize your resources – Particularly when testing large groups, it can be a daunting task to try addressing the risk factors you find. If you categorize individuals by their degree of risk (Lehr 2013), you can make the process more manageable.  Check out how a Division III college did it with their Body Armor Program.

3. It’s gonna take a village – I frequently feel like I am on an “injury prevention island”. With some discussion, I do find many like-minded individuals. Some have tried injury prevention strategies before  only to stop because they didn’t have good buy in. Others (particularly coaches) want to implement injury prevention, but don’t know how. Still others have misconceptions about how long it is going to take or how difficult it is. Just like other behavioral change, Start with Why to get people on board. When talking with a coach, discuss performance and durability benefits. For medical personnel, discuss keeping our athletes healthy and on the field.  Also, think outside of the box when assembling your team of testers.  Elicit the help of students (of any type: exercise physiology, PT, ATC, etc can help with the simpler testing), coaches (corralling the athletes), parents (ensuring forms are completed), and front desk personnel (data entry). They can all do something to help.

4. Use reliable, evidenced-based, predictive tests that can be completed quickly – Most frequently, I use injury history, Y Balance Test and Functional Movement Screen (I clearly acknowledge my bias here — I would love to hear what you use).

5. Start with Return to Sport Testing – Remember, previous injury is the most consistently reported risk factor for future injury so be sure you are using predictive, evidence based tests in your discharge protocol. Over the next several posts, I will take research based look at discharge testing and answer some commonly asked questions like:

    • What should the limb symmetry be for hop testing? (hint: it is NOT 90%)
    • What percent of athletes return to sport after ACL reconstruction?
    • Do strength and range of motion testing matter?
    • What does research tell us about basic movement testing?

So, if you are currently doing injury prevention, write down your goals for making your injury reduction strategies better than next year. If you haven’t started, utilize a few of the strategies to get started on a small scale. For those of you who have implemented injury prevention programs, please share your strategies with the group by commenting below.

When it comes to injury prevention, we are all excited, passionate and ready to get started only to hit road blocks: No one seems to want to give it the attention that it deserves. Coaches don’t want to give up valuable practice time, parents can’t fit it into jam packed schedules, and athletes, well, they are athletes!

Over the past 15 years, I have made many failed attempts at implementing injury prevention programs, so I would like to share with you what I have learned. After a great Twitter Chat with #solvePT, I decided to focus this blog post on talking with coaches and parents.

Fallen Tree Blocking Road

Some of the best injury prevention researchers in the world looked back at their injury prevention efforts with a huge cohort of female handball teams over a 10 year period (Mykelbust et al 2013). One of their key findings is that for injury prevention to be successful you “must have the coach as a “partner” in the process”. But how exactly do you do that?

Frequently, because of our passion, we provide too much information and end up sounding like a pushy salesperson. When talking with coaches and parents I suggest breaking it down into several steps:

  • Step #1: Ask, “Can I test your team/athlete to see how they are doing?”  Don’t promise too much. Just mention that there is some good research about the ability to identify athletes at more risk of injury and improve their performance. (Remember: researchers have found that the message should focus on both performance and prevention — also remember that if you are on the bench with an injury, you can’t perform!)
  • Step #2 After testing, don’t say anything. Wait for coach/parent to say: “How did they do?” Now you have some buy in because they are asking the question — you are not pushing information
  • Step #3 Tell them how they did: “I found these risk factors and research indicates that puts them at risk for injury.” Then be quiet. This is THE hardest part!
  • Step #4 Parent/Coach says “Well, what are YOU going to do about it?” I say smiling, “I’m glad you asked.” — Total buy in
  • Step #5 Present your evidence-based injury prevention strategy by changing the modifiable risk factors you tested

While these steps are the best way I have found to have the conversation, it is by no means 100% effective. I think the other key ingredient is persistence. Mykelbust et al said it best:

“persistent effort to promote injury prevention over several years, using every opportunity available”

It can take years to change the culture of any organization. In future posts, I will talk about specific implementation strategies. Sign up for this blog to be sure you get notified when it comes out.

I really want to hear from you. What strategies have you found to be successful to get people on board with your passion?


About Phil

Phil Plisky

I want to change peoples lives through dialogue about injury prevention research and return to activity testing.

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