Anatomy of a Running Injury – Part 2

Stay the CourseIn the first installment of Stay the Course, Anatomy of a Running Injury – Part 1, we discussed the two necessary components of injury formation: abnormal forces and abnormal tissues. It takes but one, but more commonly – especially with chronic injury – they conspire.

How, then, do we go about fully and effectively treating a running injury? There are many therapies, medicinals, and gadgets out there. Most, if not all, can be very helpful. Revisiting Dr. Noakes’ Rules of Running Injury, Rule 6:

Treat the cause, not the effect of the injury.

Thus, to truly attack and defeat injury, one must address the following causal elements:

Mechanical – Neuromuscular – Motor Control

These terms – and this treatment approach – are adopted from the curriculum of The Institute of Physical Art, a treatment philosophy in the physical therapy field. The “IPA” teaches coursework to allied health professionals on a variety of areas, ranging from spine care to orthopedics to even visceral (read: guts!) mobilization. But central to all interventions is addressing those three fundamental elements.

Mechanical
This concept deals with the tissue’s ability to move passively. Simply put: can the muscle, tendon, or joint physically move in the way you need it? If not, your body – the brain, nerve, and muscles – cannot efficiently move. It’s like pushing against a brick wall or trying to bend a rusty hinge.

Mechanical restoration is an integral and well-recognized element to treatment. As such, there are thousands of skilled health care folk out there – PTs, chiropractors, massage therapists, osteopaths, to name a few – that skillfully mobilize tissue to normal range of motion and extensibility.

But that is only part of the picture. Without any more, what is to keep the tissue from reverting to dysfunction? This is why tissue mobilization frequently results in only temporary relief.

Neuromuscular
The nerve plus the muscle equal the motor unit. Functional motor units range in size from the microscopic (nerve ending + myofibril) to the muscle bulk, itself. Like a car engine, efficient movement requires we “fire on all cylinders:” each motor unit being activated to assist in the movement.

So what makes a cylinder fail to fire? Inflammation, mechanical restriction, pain inhibition, and changes in motor control can all “turn off” muscle. Neuromuscular inhibition does not mean the muscle is paralyzed or atrophied; instead, it is simply that the brain does not [fully] recognize the motor unit as a useful element in movement – just as the cylinder is intact, yet fails to combust the fuel within it.

Health care folk and runners alike recognize the importance of muscle strength in healthy function. However, simply “strengthening” a muscle does not ensure activation, and more often than not, hypertrophic changes (e.g., muscle growth) is unnecessary… just as the addition of another cylinder to the engine neither fixes the original mal-firing or ensures the new cylinder, itself, will actually fire!

For example, a multitude of studies on patellofemoral pain (e.g., “runner’s knee”) have correlated weakness of the hip abductors to knee pain. Most runners – and sports med docs – recognize this, but few runner’s knee cases are effectively treated with full recovery simply by performing isolated hip abductor strengthening.

Why? Because they’re missing the most important element:

Motor Control
A vitally important (and in my professional opinion, the most important) element of injury treatment is motor control. How do you move your body in space – integrating mechanical movement with synchronous motor unit firing – to achieve a desired outcome? For us, quite simply: how do you put one foot in front of the other?

Motor control is performance – how you do it. It is where the rubber meets the road, and where the buck ultimately stops. Performance is either efficient or it is not. Lucky for us, efficiency is a sliding scale; however, that sliding scale can be both slippery and insidious – where inefficient changes can gradually take place, often without our awareness.

Some important points:

  • Motor control is athletic skill: the integration of healthy tissues and a working nervous system to create movement. As such, to optimize motor control takes far more than “stretching and strengthening.” A clinical pearl I often share: to believe you can improve running mechanics simply by doing strengthening exercises is like telling a golfer with a mean slice that he’ll hit it straight if he does some bicep curls. It might help, but strength is not motor control.
  • Inefficient motor control results in abnormal forces on your tissues and, in most cases, more stress. It is like “slamming your thumb in a door,” perhaps quite gently, but relentlessly. The more inefficient, the more forceful the slam. The best mechanical and neuromuscular therapy is no match for more door-slamming. Sometimes, simply removing thumb from said door is the only therapy necessary!
  • “Pain is the Greatest Teacher.” Running is a natural human movement: ever see a young child run effortlessly with graceful precision on a playground? As a certain book argues, we’re “born” to do it. So how do we get from there, to the “ultra shuffle?”Pain.As discussed in Part 1, pain is a danger signal: of impending tissue damage, or simply fatigue. An automatic response to pain is compensation to avoid loading the affected tissues. And it needn’t be real pain, soreness can have the same effect. Thus, the cumulative soreness from heavy training alone, in absence of any true injury, can potentially alter motor control.

To summarize: motor control is athletic skill, with a quality of efficiency, which is susceptible to change. And poor motor control can result in abnormal forces on tissues.

This brings us to Dr Noakes’ 8th Rule of Running Injuries:

Never accept as final the opinion of a non-runner.

What I believe Dr. Noakes is referring to is the notion that a non-runner lacks the knowledge and/or belief system requisite to comprehensively treat your injury. I don’t fully agree with this; there’s nothing inherently ignorant about non-runners, nor is there an inherent knowledge of running mechanics by expert runners (to the contrary, I might argue – but that’s fodder for a future post).

Instead, I propose a different rule:

Never accept as final the treatment of your running injury until your gait mechanics have been thoroughly examined and treated.

We’re runners, not football players. Our injuries don’t come from tackles or cut-blocks or other “Acts of God” (the infrequent fall being a previously-mentioned exception). How we move our bodies the primary factor in performance and pain. Without thoroughly examining your mechanics in the treatment, how could you expect forces to return to normal?

Analyzing and training gait mechanics is hard. But so is orthopedic surgery and there are tons of skilled surgeons out there. If your sports medicine practitioner doesn’t look at how you run, ask them. If you get a blank stare or a paled expression in return, you need to go elsewhere. There’s a lot of skilled folk out there. Ask around.

* * * * *

Let’s now briefly return to the example from Part 1: the woman with left knee pain. Here are the issues to consider:

Mechanical: Knee, ankle, and hip flexibility – do they allow normal, fluid stride mechanics? This required joint mobilization and stretching techniques.

Neuromuscular: During strength and movement testing, she notes being unable to feel her glut muscles. Absent of true atrophy, this represents a neuromuscular deficit. Sustained holds of standing hip abduction/extension positions were used to “turn on” these muscles.

Motor control: A close examination of her run stride reveals significant issues:

–       Excessive vertical forces (“bouncing”) and a lack of forward propulsion

–       Medial knee collapse (a by-product of that vertical energy / lack of propulsion)

–       Lack of normal knee flexion on the affected side – a compensatory pain response from three months of knee pain – all three of which she was completely unaware.

Specific run drills and proprioceptive cueing (e.g., “can you feel this?”) were used, along with guidance to avoid any limping or favoring, with her return to running.

I’m happy to report that, after three months of pain, this runner has now returned to running, thanks in large part to this comprehensive approach.

Finally, if that weren’t enough, I will add one more important factor: Inflammation. Even with skillful treatment of Mechanics, Neuromuscular, and Motor Control, sometimes tissues are just, plain irritated. Give them the time to rest and repair – all the while addressing those “Big Three” factors. Sufficient rest and gradual build-up will ensure that you keep both tissues and forces normal, and your running happy and healthy.

To summarize:

  • When injured, be sure to consider all three factors: Mechanical, Neuromuscular, and Motor Control.
  • Insist that your sports medicine professional closely examine your run mechanics. If they won’t or if they don’t have that skill set, find someone who does. It may be the most important thing you do.
  • Don’t underestimate the importance of rest and gradual build-up in your return to training. Even perfection on irritated tissue can perpetuate pain.

Call for Comments

  • What are your experiences with injuries requiring Mechanical-Neuromuscular-Motor Control approaches to rehabilitation?
  • Have you ever attempted to change your stride mechanics? If so, why, how, and how did it work out for you?

[The contents of this column as well as the author’s comments are provided for general informational purposes only and are not intended as a substitute for professional medical advice. Do not use the information on this website for diagnosing or treating any medical or health condition.]

Joe Uhan

is a physical therapist, coach, and ultrarunner in Eugene, Oregon. He is a Minnesota native and has been a competitive runner for over 20 years. He has a Master's Degree in Kinesiology, a Doctorate in Physical Therapy, and is a USATF Level II Certified Coach. Joe ran his first ultra at Autumn Leaves 50 Mile in October 2010, was 4th place at the 2015 USATF 100K Trail Championships (and 3rd in 2012), second at the 2014 Waldo 100K, and finished M9 at the 2012 Western States 100. Joe owns and operates Uhan Performance Physiotherapy in Eugene, Oregon, and offers online coaching and running analysis at uhanperformance.com.