Popliteus Tendinopathy

Understanding Popliteus Tendinopathy

The poplitues muscle is a small, short muscle located deep on the back of the knee.  It is a key stabilizer muscle of the knee, and plays an important role in maintaining proper mechanics at the knee with weight-bearing activities such as walking, running, and climbing stairs. If the popliteus muscle becomes strained or overloaded pain can occur in the back of the knee.  In some cases, pain may also develop on the lateral aspect of the knee where the popliteus tendon originates on the distal femur (these symptoms often mimic iliotibial band pain, so differentiation of these two conditions is important).

In our experience, almost every case of popliteus tendinopathy/strain is related to a biomechanical problem as the hip and/or foot that is creating excessive strain on the popliteus muscle. These issues must be addressed to fully resolve the popliteus problem (see discussion below).

Signs and Symptoms of Popliteus Tendinopathy

  • Gradual onset of pain and/or tightness on the back of the knee
  • Possible pain on the lateral aspect of the knee
  • Generalized stiffness or tightness of the knee

What Causes Popliteus Tendinopathy?

Popliteus Tendonopathy is an example of a repetitive strain injury.  Unlike a traumatic injury which is caused abruptly following a trauma or accident, repetitive strain injuries (referred to as an RSI for short) are associated with very small amounts of tissue stress and damage that, if not addressed, can accumulate slowly over time and lead to pain.

Here’s how this works….

As the popliteus is stressed and over-used it can lead to small scale damage in the muscle and/or popliteus tendon.  This damage is referred to as ‘micro-trauma. Although only small this damage still needs to be repaired.  The body does this by forming new tissue in and around the injured tissue.  This new tissue, often referred to as scar tissue or soft tissue adhesions, is very sticky and acts to ‘glue’ the damaged tissues back together.  For an analogy, think of a big rubber band with a pinprick in it.  This pin-prick does not affect the rubber band much, but we still want to repair it so we put a little dab of glue over the area.

If the overload at the popliteus continues (this is almost always associated with biomechanical problems at the hip or foot, see below) there will be ongoing micro-trauma and subsequent repair of this micro-trauma. Overtime, this scar tissue will build up and will start to interfere with the normal strength and flexibility of the popliteus.  Going back to our analogy, think of this as more and more pinpricks in that rubber band, followed by a big build-up of glue around the area.  This will, in turn, make the rubber band stiffer and weaker.  As scar tissue builds-up in the popliteus, it cannot stretch or contract as well.  At this point pain and in the back of the knee (or in some cases on the lateral aspect of the knee) will develop.

Why the Hip and Foot are Important with Popliteus Tendinopathy

It is important to realize that many cases of patellar tendinopathy are actually caused by a problem at the hip or foot.  If the muscles around these segments are not working properly it will force the popliteus to contract harder than normal during activities such as walking, running, climbing stairs, or with exercises at the gym.  With this scenario the popliteus is essentially forced to compensate for these problematic muscles.  (“Do you want to know if your knee pain is linked to a problem at your hip or foot?  Try a squat test, 1 leg squat test, or lunge test). If these issues are not resolved the knee pain will not fully resolve, and will likely come back in the future.

Treatment – Resolving PopliteusTendinopathy

The proper treatment of popliteus tendinopathy must not only address pain and tissue damage at the popliteus itself, but MUST correct any biomechanical problems at the hip or foot as well (remember, these factors are often what is creating the overload at the popliteus in the first place).

For treatment to be effective we have found that there are certain steps that must be followed, and these steps must be performed in the right order if we are to expect the right results.  Here is our approach when treating popliteus tendinopathy in our clinic….

Step 1 – Resolve scar tissue adhesions and facilitate healing

Perhaps the most critical step is to treat the scar tissue adhesions.  These adhesions are a sign that the popliteus (or muscles around the hip or foot) is not healthy, and unhealthy tissue will not respond as well to traditional stretches and exercises – think of trying to stretch out that rubber band caked with glue. Resolving scar tissue adhesions is a critical step in resolving popliteus tendinopathy, but it is often a missed or underappreciated step as many practitioners do not have the clinical skills to address this problem.

Scar tissue adhesions do not resolve with stretching or traditional massage or soft tissue methods, but instead must be treated with specialized techniques.  One of the most effective methods is to use a technique known as Active Release Techniques (ART). For those who are unfamiliar with this treatment method, ART is a new and highly successful hands-on treatment method that was specifically designed to identify and address scar tissue adhesions that are interfering with the normal movement of the body.

During an ART treatment, the practitioner will first shorten the muscle, tendon, ligament, or joint capsule and then apply a very specific tension with their hands as they stretch and lengthen the tissues.  As the tissue lengthens the practitioner is able to assess the texture and tension of the tissue to determine if the tissue is healthy or contains scar tissue that needs further treatment.  When scar tissue adhesions are felt the amount and direction of tension can be modified to treat the problematic area.

Step 2 – Correct strength and flexibility

Simply treating the scar tissue adhesions will make the damaged tissue healthier, and will often result in a significant reduction in pain.  In fact, it is not uncommon to see a significant improvement in just a few visits.  However, although addressing the scar tissue makes the muscles healthier, they may still be somewhat tight or weak.  When this is the case-specific stretches or exercises can be incorporated into a home exercise/rehabilitation routine to help support in-office care. Initially, the focus is on correcting local muscle deficiencies (i.e., at the knee, hip, or foot).

Step 3 – Re-Train Functional Movement Patterns

The final stage with treatment is to ensure proper alignment and movement coordination of the foot, knee, hip, and trunk with functional movement patterns.  This ensures movement of the hip, knee, and foot are coordinated and working together as a unit.  This is what is required during real-life activities such as running, walking, cycling, and climbing stairs (the key functional movement patterns with respect to popliteus tendinopathy include the squat, 1 leg squat, and lunge).

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