Knee Pain on Outside of Joint: Four Reasons Why

Aug 12, 2022 | Knee Pain

knee pain on the outside of joint lateral osteoarthritis

Do you have pain on the outside or outer side of your knee joint? Learn about the four common causes and what you can do about them.

IT Band Syndrome

Causes & Symptoms

This chronic injury is the bane of many runners, causing a sharp painful sensation where the iliotibial (IT) band inserts onto the outside of the shin bone. The repetitive motion of the fibrous IT band rubbing over other knee structures causes excessive friction leading to inflammation. Typically symptoms intensify over time particularly during periods of greater physical activity. The precise cause of the ITBS is currently unclear – bow leggedness, excessive foot supination, overtraining and weak hip muscles have been shown to contribute to the disorder, albeit not consistently.1

it band syndrome cause of outer knee pain on the outside

Did You Know?  IT Band pain is the most common knee disorder diagnosed in recreational runners with knee pain on the outside of their joint.2


Standard treatment for ITBS consists primarily of strengthening and mobility exercises.3 Many therapists hypothesize that hip instability, characterized by Trendelburg’s Sign, places extra tension on the IT Band causing increased friction and pain on the outside of the knee.4 Isolated strengthening of the Hip External Rotators, Gluteus Maximus, Gluteus Medius and loosening the Tensor Fasciae Latae (TFL) may help decrease IT band tension thereby reducing symptoms.

Lateral Collateral Ligament (LCL) Sprain or Strain

Causes & Symptoms

The Lateral Collateral Ligament (LCL) connects the outside of your thigh bone to your fibula, a narrow long bone outside of your lower leg. The injury occurs when a large force presses on the inside of the knee, pushing the joint laterally outwards (bowing). The LCL resists against this pressure, however, if it is significant enough the fibers of the ligament begin to tear away resulting in pain and instability.

knee pain on outside lateral collateral ligament lcl tear injury


An LCL strain can be suspected given pain on the outside of the knee after receiving a traumatic contact force to the inside of the knee. Your physician may order diagnostic imaging (MRI or X-ray) to assess the full extent of the damage. In cases of a complete tear, surgery may be required. Generally, symptoms resolve with rest and activity modification. However, depending on the severity, recovery times may vary – A grade 1 tear taking 2-3 weeks, and a grade 3 tear taking 3-6 months.

  • Grade I: The LCL has been overstretched, while there is no major damage, its function will be compromised until it has healed.
  • Grade II: The LCL has been partially torn and may require surgery to repair depending on the extent of the damage.
  • Grade III: A complete tear of the LCL requiring surgery to reconstruct the ligament.

Ligaments don’t only act as “chains” connecting bones together, they also are extremely receptor-rich tissues. Embedded within fibers are small cells that sense changes in joint position (proprioception). When ligaments tear the sensitivity of these cells is also disrupted – less information about knee joint position reaches the brain. This can create joint instability, losses in balance, and diminish muscle reflexes. For these reasons, after the pain subsides, balancing exercises are often used to build the joint’s sense of position back up.

Lateral Meniscus Tear

Causes & Symptoms

The meniscus acts as your knee’s shock absorber, stopping bones from contacting one another directly. Sudden twisting or torsion related movements can cause fissures and tears to develop. Injuries to the lateral (outside) meniscus makeup 3.66% of serious knee injuries – much less than medial (inside) meniscus (10.76%).5 Other than pain, another common symptom of meniscal tears is a sudden loss in mobility. It can feel like there is pressure in your knee joint limiting your ability to fully bend and straighten it.

outer knee pain lateral collateral ligaments meniscus


Treatment varies depending on the type of tear, symptoms and activity level of the patient. For most, standard physiotherapy consisting of exercises, stretching and pain management works well. Where conservative rehabilitation fails, surgery may be needed in the form of a meniscectomy. During this procedure, damaged parts of the meniscus are cut out and completely removed. While this can provide tremendous relief in the short term, there are studies to suggest that meniscus removal increases the risk of arthritis later in life.6

Lateral Knee Arthritis

Causes & Symptoms

Arthritis disproportionally effects those over the age of 508 The cartilage that normally protects the bony surfaces of your joints erodes away leaving painful bone on bone pressure. The result is an increase in internal joint friction eventually leading to the development of bone spurs. Symptoms include grinding sensations, stiffness and pain. There are four grades of knee arthritis (I-IV) which can be diagnosed using x-ray imaging.

lateral knee osteoarthritis cause of outer knee pain


In lateral knee osteoarthritis, the damage is confined to the lateral side (outside) of your knee only, meaning that the medial and patellofemoral compartments on the inside of the knee and kneecap may still be quite healthy. There are many treatment options at your disposal. Pharmaceutical, exercise, diet, knee braces, injections, and surgery are all viable options. If you are suffering from severe knee arthritis, surgery may be considered a last resort – most doctors recommended exhausting your conservative treatment options first.9 For eligible patients, full knee replacement surgery can provide dramatically improve the quality of life and reduce painful symptoms. That being said, not everyone is happy with the final results from their surgery, the recovery is lengthy, and the procedure itself is extremely invasive.

Resources for Knee Pain on the Outside

Hopefully, this information has provided you with some insight as to what could be causing the pain on the outside of your knee. For more information on knee pain treatments visit our Complete Guide to Knee Pain

If knee arthritis is the underlying cause of your knee pain check out:

Try a FREE exercise program for knee OA with the Knee Boost Home Workout.

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  1. Pegrum, J., Self, A., & Hall, N. (2019). Iliotibial band syndrome. BMJ, l980. doi:10.1136/bmj.l980
  2. Lavine, R. (2010). Iliotibial band friction syndrome. Current reviews in musculoskeletal medicine, 3(1-4), 18-22
  3. Falvey, E. C., Clark, R. A., Franklyn-Miller, A., Bryant, A. L., Briggs, C., & McCrory, P. R. (2010). Iliotibial band syndrome: an examination of the evidence behind a number of treatment options. Scandinavian Journal of Medicine & Science in Sports, 20(4), 580–587.doi:10.1111/j.1600-0838.2009.00968.x
  4. Baker, R. L., Souza, R. B., & Fredericson, M. (2011). Iliotibial Band Syndrome: Soft Tissue and Biomechanical Factors in Evaluation and Treatment. PM&R, 3(6), 550–561.doi:10.1016/j.pmrj.2011.01.002
  5. .Frizziero, A., Ferrari, R., Giannotti, E., Ferroni, C., Poli, P., & Masiero, S. (2012). The meniscus tear: state of the art of rehabilitation protocols related to surgical procedures. Muscles, ligaments and tendons journal, 2(4), 295.
  6. Englund, M., Roos, E. M., & Lohmander, L. S. (2003). Impact of type of meniscal tear on radiographic and symptomatic knee osteoarthritis: A sixteen‐year followup of meniscectomy with matched controls. Arthritis & Rheumatism: Official Journal of the American College of Rheumatology, 48(8), 2178-2187.
  7. Arthritis By The Numbers (2018). Arthritis Foundation v2; 4100.17.10445
  8. Crawford, D. C., Miller, L. E., & Block, J. E. (2013). Conservative management of symptomatic knee osteoarthritis: a flawed strategy?. Orthopedic reviews, 5(1)
  9. K.S. Al-Obaedi, O. Shah, M. (2018). Prevalence of Compartmental Osteoarthritis of the Knee in an Adult Patient Population: A Retrospective Observational Study. EC Orthopaedics