What Causes Runner?s Knee?
Runner?s Knee is an overuse injury caused by excessive & repetitive strain. Or simply put, doing too much, too soon, too frequently.
It is important to note that unlike many other sporting injuries, there is no actual tissue damage associated with Runner?s Knee pain. No bones are broken, no tendons are torn and no cartilage is damaged. The pain you feel is instead coming from inflamed tissues that surround the knee cap, particularly fat, bursa and synovial membrane.
These tissues work to lubricate the knee joint and provide extra cushioning between the bones. When there is an unusually high level of stress on the knees, these tissues get irritated & inflamed. This inflammation acts as a warning of potentially more serious tissue damage if the stress continues.
Every tissue in the body (bone, cartilage, fat, tendon, muscle, etc.) has a certain level of stress that it?s used to handle. This stress tolerance develops over many years and is determined by your lifestyle ? what your body needs to do on a regular basis. Professional athletes, for example, develop a much higher tolerance for repetitive physical stress than sedentary office workers because they condition their body to handle intense amounts of exercise.
Overuse injuries, like Runner?s Knee, occur when repetitively high levels of stress are placed on a joint that go beyond what those tissues have adapted to handle.
For most people, getting Runner?s Knee is simply a sign that they need to slow down their training and better prepare their body to handle the stress of long-distance running.
Runner?s Knee is an overuse injury caused by doing too much, too soon. It?s a sign that your body wasn?t ready for that much running.
A Common Misconception
?It?s Caused By Bad Knee Alignment?
One of the most common myths about Runner?s Knee is that it happens because of kneecap ?maltracking?. This idea that the kneecap moves ?out of alignment? and rubs against the tibia bone of the shin.
For a long time, doctors and physiotherapists believed this bone-on-bone rubbing caused the pain and wore down cartilage. However, we now have a lot of evidence to show this isn?t the case, bad knee alignment does not cause Runner?s Knee.
People have kneecaps of many different shapes and sizes, and it is common for kneecaps to move at slightly different angles as the knee bends. We now see that these anatomical variations are not a fault in some people but rather, normal human structure.
Research studies have proven that people who have ?less than ideal? alignment (who we would have expected would get Runner?s Knee) are no more likely to develop the injury than people who have textbook ?perfect? knees.
(1) Physiotherapy Exercise
The most effective treatment for Runner?s Knee is exercise rehabilitation. Strengthening the hip and knee muscles is proven to significantly reduce pain and improve function, allowing runners to return to normal physical activity within 6?12 weeks of treatment.
A study released in 2016 also showed that 73% of runners who completed a course of exercise rehabilitation remained pain-free three years after their initial injury.
An exercise rehabilitation program should focus on hip and knee exercises, as well as core strength and balance.
Exercises should be performed 2?3 x per week with a gradual progression in the difficulty.
**Get an 8-Week Runner?s Knee Rehab Program Here
(2) Foot Orthotics
There is some good research to suggest that foot orthotics can be effective in reducing the pain of Runner?s Knee.
(3) Taping and Bracing
K-tape, sports tape, and knee braces can help reduce knee pain while running.
These modalities work by offloading some of the stress on the knee. They?re a good option for runners who are racing (or training) with mild Runner?s Knee. However, tapes and braces do not access the cause of the injury and are therefore not long term solutions.
Gulati et al. 2018,Current Clinical Radiological, and Treatment Perspectives of Patellofemoral Pain Syndrome,British Journal of Radiology, 91, p.1086 Dutton et al. 2016,Patellofemoral Pain,Physical Medicine and Rehabilitation Clinics in North America, 27, p. 31?52
Dye. S 2005,The Pathophysiology of Patellofemoral Pain,Clinical Orthopedics and Related Research,436, p. 100?110
Neal et al. 2019,Risk Factors for Patellofemoral Pain: a Systematic Review and Meta-Analysis,British Journal of Sports Medicine, 53, p. 270?281
Esculier et al. 2016,Effects of Rehabilitation Approaches for Runners with Patellofemoral Pain: Protocol of a Randomised Clinical Trial Addressing Specific Underlying Mechanisms,BMC Musculoskeletal Disorders,17, p. 5
Earl-Boehm et al. 2018,Treatment Success of Hip and Core or Knee Strengthening for Patellofemoral Pain: Development for Clinical Prediction Rules,Journal of Athletic Training, 53, p. 545?552
Bolga et al. 2016,Pain, Function and Strength Outcomes for Males and Females with Patellofemoral Pain who Participate in Either a Hip/Core or Knee Based Rehabilitation Program,International Journal of Sports Physical Therapy,11,p. 926?935
Keays et al. 2016, Three-Year Outcome After a 1-Month Physiotherapy Program of Local and Individualized Global Treatment for Patellofemoral Pain Followed By Self Management, Clinical Journal of Sports Medicine, 26 (3), pp 190?198
Alina Kennedy is an Australian Physiotherapist, Strength & Conditioning Specialist and avid runner. She works exclusively with runners in injury rehabilitation, prevention, and performance improvement. Learn More Here
Originally published at https://sprintrehab.com.