Is running bad for your knees?

Humans are bipedal creatures designed to move forward on two feet. It seems odd that the most efficient way of moving our bodies from point A to point B would be bad for our joints, yet running receives a lot of criticism. Running has historically been criticized by the general public and even some medical professionals for “putting too much stress on the joints” leading to pain, injury, and osteoarthritis.

 

Evidence does not support that running is associated with increased risk of osteoarthritis (OA). There is evidence that suggests decreased physical activity is associated with increased incidence of osteoarthritis.

 

Over the past century our culture has become more and more sedentary.  A recent study1 found the prevalence of knee osteoarthritis among individuals over 50 years old in the early industrial era (late 1800s to early 1900s) was 6% compared to 16% of individuals in the post-industrial era (late 1900s to early 2000s).  After controlling for age and BMI, the data indicates the prevalence of knee OA has increased by 2.1-fold over the last century.

 

Osteoarthritis is not a disease of wear and tear. Sedentary lifestyles, obesity, and chronic inflammation are more likely to contribute to developing osteoarthritis than running. 

 

This progressive disorder is characterized by inflammation and loss of cartilage that lines the ends of bone. Running is an effective form of activity to control weight, manage BMI, and reduce systemic inflammation. The repetitive movement and force within the joint stimulates repair and maintenance mechanisms to maintain healthy cartilage. Running may actually decrease your risk of developing OA, while inactivity may increase your risk. This does not account for trauma disrupting ligaments or cartilage that occurs with running.

 

The cartilage in our knees functions as a shock absorber. Articular cartilage does not have a blood supply. Rather it gets its oxygen and nutrients from the surrounding joint fluid. Repeated compression of the joint allows water to flow in and out of the cells delivering nutrients to the tissue. The weight that bears down on your joints when you exercise forces water molecules out of the cartilage like a sponge. When the weight is lifted, water flows into the cells bringing oxygen and nutrients the joint.

 

Still think running is bad for your knees?

Let’s look at the research that indicates running does not cause damage to the knees or increase risk of developing osteoarthritis.

 

A study by Eliza4 compared 45 long distance runners to 53 non-runners with a mean age of 58 over the span of 20 years. Radiographic evidence showed no difference in prevalence of knee osteoarthritis between the two groups.

 

Another study by Kessler5 looked at the short-term effects that long distance running has on cartilage and meniscus. Cartilaginous volume was measured by MRI in 48 runners before a 20 km run, immediately after the run, and after a one hour recovery. Decrease in cartilage volume was found immediately after the run but was no longer significant after one hour. The recovery of cartilage and meniscal volumes suggests that these tissues are able to adapt to the loads caused by running.

 

Krampla7 conducted a 10-year study looking at the changes in knee joints of marathon runners. No adverse long-term consequences were observed in six of the seven active runners at the 10- year MRI follow up.

 

A longitudinal study by Sohn8 compared 504 former college cross-country runners with 284 former college swimmers. The subjects were observed for an average period of 25 years.  They found that moderate long-distance running (average 25.4 miles per week) was not associated with higher incidence of osteoarthritis of the hip or knee.

 

A study by Kujala9 looked at the prevalence of knee OA among former athletes of varying sports. The prevalence of knee OA determined by radiographic examination was 3% in shooters, 29% in soccer players, 31% in weightlifters, and 14% in runners. This study does not control for knee joint trauma contributing to the development of osteoarthritis; however, it does not support the idea that running is worse for your knees than other forms of physical activity.

 

Lane10 performed a study including 33 matched pairs of long-term, long-distance runners and non-runners over the age of 50. The study showed no difference in the incidence of osteoarthritis in runners and nonrunners. The results remained the same at a 9-year follow up.

 

 Our bodies are designed to move, and our joints are designed to withstand the demands of running. The repetitive movement that occurs with running facilitates the delivery of nutrients to the knee joints and stimulates repair mechanisms to maintain healthy cartilage. There are limitless forms of physical activity to optimize health and fitness. Running may not be for you, but please stop telling other people it is bad for them. The evidence indicates running is not bad for your knees and does not increase your risk of developing osteoarthritis.


If you are interested in running and do not have previous experience, come see one of our Doctors of Physical Therapy for a complete movement analysis. We will assess your mobility and strength and provide you with the tools to safely begin a running program. 

 

If you run, you are a runner. It doesn’t matter how fast or how far. It doesn’t matter if today is your first day or if you’ve been running for twenty years. There is no test to pass, no license to earn, no membership card to get. You just run. – John Bingham

 

Written by Hannah Sweitzer, DPT, OCS

 

References

  1. Ian J. Wallace, Steven Worthington, David T. Felson, Robert D. Jurmain, Kimberly T. Wren, Heli Maijanen, Robert J. Woods, Daniel E. Lieberman. Knee osteoarthritis has doubles in prevalence since the mid-20th century. Proceedings of the National Academy of Sciences Aug 2017, 114 (35) 9332-9336; DOI: 10.1073/pnas.1703856114
  2. Sophia Fox AJ, Bedi A, Rodeo SA. The basic science of articular cartilage: structure, composition, and function. Sports Health. 2009;1(6):461-468. doi:10.1177/1941738109350438
  3. Tamer TM. Hyaluronan and synovial joint: function, distribution and healing. Interdiscip Toxicol. 2013;6(3):111-125. doi:10.2478/intox-2013-0019
  4. Eliza F. Chakravarty, Helen B. Hubert, Vijaya B. Lingala, Ernesto Zatarain, James F. Fries. Long Distance Running and Knee Osteoarthritis: A Prospective Study, American Journal of Preventive Medicine, Volume 35, Issue 2, 2008, Pages 133-138, ISSN 0749-3797, https://doi.org/10.1016/j.amepre.2008.03.032.
  5. Kessler, MA , Glaser, C. , Tittel, S. , Reiser, M. , Imhoff, AB Volume changes in the menisci and articular cartilage of runners: an in vivo investigation based on 3-D magnetic resonance imaging. Am J Sports Med. 2006;34(5):832–836.
  6. Kessler, MA , Glaser, C. , Tittel, S. , Reiser, M. , Imhoff, AB Recovery of the menisci and articular cartilage of runners after cessation of exercise: additional aspects of in vivo investigation based on 3-dimensional magnetic resonance imaging. Am J Sports Med. 2008;36(5):966–970.
  7. Krampla, W.W., Newrkla, S.P., Kroener, A.H. et al. Changes on magnetic resonance tomography in the knee joints of marathon runners: a 10-year longitudinal study. Skeletal Radiol 37, 619–626 (2008). https://doi.org/10.1007/s00256-008-0485-9
  8. Sohn RS, Micheli LJ. The effect of running on the pathogenesis of osteoarthritis of the hips and knees. Clin Orthop Relat Res. September1985:106 –109
  9. Kujala UM, Kettunen J, Paananen H, Aalto T, Battie MC, Impivaara O, et al. Knee osteoarthritis in former runners, soccer players, weight lifters, and shooters. Arthritis Rheum. 1995;38:539 –546.
  10. Lane NE, Michel B, Bjorkengren A, Oehlert J, Shi H, Bloch DA, et al. The risk of osteoarthritis with running and aging: a 5-year longitudinal study. J Rheumatol. 1993;20:461 –468
  11. Cymet, Tyler Childs and Sinkov, Vladimir. “Does Long-Distance Running Cause Osteoarthritis?” Journal of Osteopathic Medicine, vol. 106, no. 6, 2006, pp. 342-345. https://doi.org/10.7556/jom_2006_06.0004

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