Knee Pain
PAIN CONDITION
About Knee Joint Pain
The knee is one of the largest joints in the body and takes a lot of daily abuse.[2] Many people experience pain for a variety of reasons from sudden injuries, overuse, or underlying medical conditions like arthritis.[3] Pain may be localized to a specific area, such as the kneecap (patella), or affect the entire joint. It may come and go, feel deep within the joint or radiate to your thigh or calf.[2] Knee pain is usually caused by overuse, injury or arthritis.[2] Some people experience temporary knee pain that goes away with self-care, while others deal with more severe and chronic pain that requires ongoing treatment.
Knee Pain Symptoms
- Swelling [3]
- Stiffness [3]
- Redness and warm to the touch [3]
- Weakness or instability [3]
- Popping or crunching noises [3]
- Inability to fully straighten leg [3]
- Pain behind your knee [2]
- Radiating pain [2]
- Joint pain [2]
- Locking or buckling [4]
- Difficulty bearing weight [4]
Knee Joint Pain Causes
Knee pain can be caused by injury, mechanical problems and other painful conditions such as:
- Injury or accident [3]
- ACL tear [3]
- Torn meniscus [3]
- Kneecap (patella) fracture [3]
- Bursitis [3]
- Patellar tendinitis [3]
- Dislocated kneecap [3]
- IT band syndrome (iliotibial)[3]
- Osteoarthritis [3]
- Rheumatoid arthritis (RA) [3]
- Gout [3]
- Patellofemoral pain syndrome [3]
- Overuse “runner’s knee” [4]
- Aging [4]
- Being overweight [4]
- Baker’s cyst [4]
- Osgood-Schlatter disease [4]
Pain Management Treatments
Treating conditions like arthritis with medications, exercise, non-surgical interventions and lifestyle changes will help slow progression and provide long-term pain relief. For more severe or chronic pain, pain management doctors offer advanced, non-surgical treatments such as viscosupplementation (hyaluronic acid injections), nerve blocks, joint injections and PRP therapy. In some cases, despite comprehensive care, surgery is required.
When to Consult a Knee Pain Care Specialist
Frequently Asked Questions About Knee Pain
What are the most common causes of knee pain?
Knee pain may result from arthritis, ligament or meniscus injury, tendon problems, bursitis, kneecap disorders, fracture, gout, or pain referred from the hip or back. Sudden pain after twisting suggests a different problem from gradual pain with stairs or prolonged activity. The location, swelling pattern, instability, and injury mechanism help guide the diagnosis.[1][2]
When does knee pain require urgent medical attention?
Prompt assessment is appropriate after significant trauma when the knee is deformed, cannot bear weight, locks completely, or rapidly develops major swelling. Fever with a red, hot, swollen joint requires urgent evaluation for infection. A cold, pale, numb foot or new severe calf swelling and shortness of breath also requires immediate care because circulation or a blood clot may be involved.[2][3]
How is knee pain diagnosed?
Diagnosis includes a history of onset and injury, followed by examination of swelling, tenderness, alignment, stability, movement, and gait. X-rays identify fractures and arthritis, while MRI may assess menisci, ligaments, cartilage, and other soft tissues. Ultrasound or joint-fluid testing can be useful in selected cases. Imaging findings are matched to symptoms because some structural changes occur without causing pain.[1][3]
Why does a knee click, pop, or lock?
Painless clicking can occur during normal movement, but painful popping after injury may indicate ligament or meniscus damage. Locking can result from a meniscal tear, loose body, swelling, or kneecap problem. A knee that repeatedly gives way may reflect instability or weakness. Mechanical symptoms that limit movement, follow trauma, or occur with swelling should be evaluated rather than repeatedly forced through.[1][4]
Can exercise improve knee pain?
Appropriate exercise can strengthen the muscles supporting the knee, improve movement, and reduce stress during daily activity. Low-impact aerobic work and progressive hip, thigh, and calf strengthening are often helpful, with modifications based on the diagnosis. Exercise should be adjusted during acute swelling or instability. A therapist can guide safe progression after injury, surgery, or a prolonged period of inactivity.[1][2]
What treatments may help chronic knee pain?
Treatment may combine activity modification, physical therapy, weight management when relevant, medication, bracing, and selected joint or nerve procedures. The best plan depends on whether pain comes from arthritis, a tendon, instability, or another structure. Surgery may be appropriate for certain injuries or advanced joint damage, but many patients benefit from a coordinated nonsurgical approach first.[2][3]
Why does knee pain sometimes continue after an injury heals?
Persistent pain can reflect incomplete rehabilitation, cartilage or meniscus damage, altered movement, muscle weakness, nerve sensitivity, or early arthritis. Swelling and guarding may change how the hip, knee, and ankle share load. Reassessment can determine whether the original diagnosis remains accurate and whether therapy, imaging, medication, or another treatment should be adjusted.[1][4]
When should someone consult a pain specialist for knee pain?
A pain specialist may help when knee pain continues despite appropriate evaluation, therapy, and medication; limits walking or sleep; or may benefit from an image-guided injection or nerve procedure. The specialist coordinates with orthopedics and rehabilitation and considers the patient’s functional goals. Acute deformity, infection signs, or inability to bear weight requires urgent assessment before routine pain care.[2][3]
Resources:
- Knee Pain and Problems. John Hopkins Medicine [Internet]. Published 2020. Accessed September 06, 2024. Available from: https://www.hopkinsmedicine.org/health/conditions-and-diseases/knee-pain-and-problems
- Knee Pain: Causes, Treatment. Cleveland Clinic [Internet]. Accessed September 06, 2024. Available from: https://my.clevelandclinic.org/health/symptoms/21207-knee-pain
- Mayo Clinic Staff. Knee pain – Symptoms and causes. Mayo Clinic [Internet]. Published 2019. Accessed September 06, 2024. Available from: https://www.mayoclinic.org/diseases-conditions/knee-pain/symptoms-causes/syc-20350849
- Vanbuskirk S, Mitchell K. What’s Causing My Knee Pain? WebMD [Internet]. Published December 23, 2016. Reviewed March 18, 20245. Accessed September 06, 2024. Available from: https://www.webmd.com/pain-management/knee-pain/knee-pain-causes