Understanding Runners Knee
November 12th, 2009 by adminIts no surprise that the most commonly injured structure in runners is the knee. At a running pace, ten times our body weight is transferred to the knee joint. Knee injuries account for over half of all running injures. One such condition is Iliotibial Band Syndrome (ITBS), also called Runners Knee.
What is Iliotibial Band Syndrome (ITBS)?
The ITB is essentially an enlarged tendon that connects from the Gluteus and Tensa Fascia Latea (TFL) muscles of the hip and runs down the outer thigh and attaches to outer (lateral) portion of the knee. ITBS presents as a unilateral burning pain on the outside of the knee. It can also cause pain to radiate up the side of thigh and/or the hip. Early on in the injury cycle, pain occurs most often at the end of the run (i.e. >45 minutes into a run). As the injury progresses, the symptoms become more pronounced in severity, occur at earlier frequencies (i.e. 10 minutes into a run) and can begin to affect both knees. Changes in your running program (either increases in total distance, or speed) are most often the mechanism of injury. Other factors can also contribute to the process including: running on hard surfaces, running on the crowned surfaces of paved roads, hill running (both up and downhill), asymmetric arches of the feet (over pronation or supination), leg length inequality (both structural and functional) and muscle imbalances of the hip/thigh. The ITB is long, strong, and prone to tightening. Recently it has been discovered that, like many conditions, it is a multi-factor injury that occurs as a sequence of events.
Stage 1 – Deconditioning
Deconditioning is another way of saying “out of shape” or “weak”. Two major events can arise as a predictor of ITB Syndrome: ITB tightening and Gluteus Medius weakness. In ITB tightening, faulty running biomechanics can place increased strain on the ITB causing it to tighten, and thicken. Tightness or uncoordinated movements in a single muscle can change the way the body moves. Altered running patterns create a less elastic ITB that is more prone to be injured. For this reason, a proper treatment plan always begins with an analysis of your running gait.
With Gluteus Medius weakness, faulty running mechanics are once again to blame. The Gluteus Medius is a small muscle designed to stabilize the hip while the leg is in contact with the ground. As it weakens, the body begins to recruit larger muscles to stabilize the hip. Surprisingly, this weakness leads to a chronic low-grade spasm of this muscle. The end result is an unstable hip which then transfers more strain onto the ITB itself. Gluteus Medius strengthening must be a part of any rehabilitation program.
Stage 2 – Secondary Effects
As the body’s usage of the ITB changes, increased “friction” arises between the structures surrounding the ITB. These alterations are the ultimate cause of the pain associated with ITB Syndrome. However, a true fix always goes beyond what causes the symptoms and addresses the root of the problems as well (the deconditioning).
There are three components to ITB Syndrome: ITB Bursitis, ITB Tendonosis, and Soft-Tissue Adhesions.
ITB Bursitis: Because of the tightening of the ITB, a compressive force is applied to the ITB bursa causing bursitis. ITB Bursa are small fluid filled sacs located just beneath the IT Band and are designed to lubricate areas of high friction between tendons and bones. They are highly prone to inflammation, and when irritated, cause pain and limitation of movement. This condition is especially resistant to therapy and the traditional approach of management is rest from running. However, new research highlights the importance of resolving the true cause by releasing the excessive tension of the ITB through effective soft tissue therapies.
ITB Tendonosis: The tightening of the ITB also causes it to rub on the bone of the lateral knee. This friction causes an irritation and breakdown of the tendon’s tissue at the cellular level. The body lays down adhesions within the tendon to compensate making it less elastic and thicker. As the tension increases, it deteriorates faster than the body can repair it. Over time, the adhesions cause more pain due to the inability to stretch. Gradually the symptoms increase and your runs become less and less enjoyable. In some cases, this can last for years and/or become episodic.
Soft-tissue Adhesions: This is quite often overlooked by many healthcare providers treating ITBS. Adhesions develop between the ITB and the Quads/Hamstrings. Essentially the IT Band sticks to the surrounding muscles causing further complications in regards to ITB function. Without releasing the soft-tissue adhesions in the surrounding muscles, resolution is incomplete and the condition is more likely to recur.
With all the possible factors, and involved structures, a thorough evaluation is the foundation upon which your recovery is built. To prevent a temporary solution, decreased performance or even a premature retirement from running, it is impertative that all these factors be considered when adressing this type of injury. An experienced profesional will be able to identify and correct these structural issues leading to a more enjoyable, even an enhanced, running career.
Carolina Spine & Sports is the premier provider of Chiropractic and Soft Tissue Treatment in Uptown Charlotte. The office focuses on providing an accurate, thorough diagnosis in combination with state of the art treatment and rehabilitation of disc, joint, and muscle injuries of the spine and extremities, as well as performance enhancement.