Knee Pain: Complete Guide

Selon une revue systématique, la prévalence de la Knee pain au cours de la vie atteint environ 54 % en Angleterre, et environ 28 % des adultes de plus de 40 ans qui travaillent en souffrent à un moment donné. Elle transforme les gestes simples en défi: monter un escalier, se lever d'une chaise, ou même marcher. Notre guide de physiothérapie pour la Knee pain explique le suivi.

Chez Physioactif, nous traitons chaque jour des personnes souffrant de douleurs au genou. Le syndrome fémoro-patellaire représente la condition du genou la plus fréquente en physiothérapie.

Here's the good news: most knee pain improves with the right treatment. Physiotherapy and exercise are as effective as medication for pain relief.

What is Knee Pain (Gonalgia)?

Knee pain, also known as gonalgia, refers to any pain in or around the knee joint. It can be mechanical (triggered when you exert yourself) or inflammatory (present at rest). It can also be acute (sudden) or chronic (lasting more than 3 months).

Gonalgia affects everyone: athletes, sedentary individuals, young people, or older adults. Knee osteoarthritis is the most common cause among adults over 40-50 years old.

Who is affected?

Knee pain is extremely common in the general population:

• 25% of adults suffer from frequent knee pain
• Knee pain becomes more common with age
• 29% of Canadians with osteoarthritis have knee pain
• Women are affected twice as often as men
• Le risque augmente significativement après 45 ans

How Does Your Knee Work?

Your knee is the largest and most complex joint in your body. It connects the femur (thigh bone) to the tibia (shin bone) and contains two menisci that act as shock-absorbing cushions.

Knee Structures

Les quatre ligaments principaux du genou jouent un rôle crucial:

• Le ligament croisé antérieur (LCA) empêche le tibia d'avancer
  
• Le ligament croisé postérieur (LCP) empêche le tibia de reculer
  
• The collateral ligaments stabilize the sides of the knee

ACL injuries are common among athletes. After an anterior cruciate ligament tear, rehabilitation first, followed by optional surgery later, is one possible course of action. In one study, about 50% of the participants in this group eventually underwent surgery, while the other half did not require it. For more information, see our guide on knee sprains and ACL tears.

What Causes Knee Pain?

Knee pain can have several causes: cartilage wear (osteoarthritis), ligament injury (sprain), meniscus problems, or muscle strain. Age, being overweight, and trauma are the main risk factors. Being overweight is one of the main risk factors for knee osteoarthritis. Losing weight reduces the load on the joint and is part of the treatment.

Mechanical and Degenerative Causes

Knee osteoarthritis (gonarthrosis) causes the cartilage to wear down gradually. In advanced cases, the bones rub directly against each other.

Nearly one in two people is at risk of developing symptomatic knee osteoarthritis at some point in their lives.
Among obese individuals, this risk rises to nearly two in three.
Losing weight reduces this risk.

To understand how to manage knee osteoarthritis, consult our complete guide on knee osteoarthritis.

Traumatic Causes

A knee sprain results from ligament damage. It is often caused by a sudden twisting motion or a rapid change in direction. The ACL is the most commonly affected ligament in athletes.

Meniscal tears occur during twisting movements. In younger people: acute trauma. In older people: gradual wear and tear. In young adults with a meniscal tear, supervised exercise yields results comparable to surgery in terms of pain, function, and quality of life.

Inflammatory Causes

Rheumatoid arthritis, gout, and pseudogout cause knee pain. These conditions are characterized by pain at rest and morning stiffness lasting more than 30 minutes. To understand the different types of joint pain, consult our dedicated guide.

How to distinguish between different types of pain and recognize warning signs?

The location and type of pain indicate the source of the problem. Pain on the side suggests a meniscus issue. A feeling of instability points to ligament involvement. Diffuse pain at the front indicates a kneecap problem. ¹

Meniscal pain

Meniscal pain is felt along the joint line (where the thigh bone and shin bone meet), either on the inner or outer side of the knee.

Indicative signs:

• Clicking or popping sounds during movement
  
• Possible knee locking
  
• Intermittent swelling
  
• Pain when twisting the knee

Ligament pain

Ligament damage is characterized by a feeling of instability. Your knee may feel like it's "giving way." Consult our guide on ligament pain for more details.

Joint pain (osteoarthritis)

Osteoarthritis pain follows a mechanical pattern. It is usually worst in the evening after a day of activity. Morning stiffness lasts less than 15 minutes. It typically does not wake you up at night.

Muscle pain

Muscle pain is located around the joint. It is accompanied by a feeling of the knee "giving way" and palpable tension.

Common Symptoms

Common symptoms include:

• Localized or widespread pain
  
• Morning Stiffness (less than 15 minutes for osteoarthritis)
  
• Swelling (joint effusion)
  
• Clicking, popping, or creaking sounds
  
• Feeling of Instability
  
• Limited range of motion

Warning signs requiring prompt consultation

Consult a professional the same day if you experience:

• Very Intense Pain
  
• Fever (possible sign of infection)
  
• Swollen, Red, and Warm Knee
  
• Knee swelling while on anticoagulants

Our physical therapists can assess your condition and provide you with a personalized treatment plan.

Make an appointment

When should you see a professional?

Seek medical attention if the pain does not improve with rest, if it gets worse, or if your knee is red, warm, and swollen. In Quebec, you do not need a doctor's referral to see a physical therapist.

Consultation in the Coming Days

Prenez rendez-vous si la douleur ne s'améliore pas malgré le repos, la glace et un antidouleur,
si les douleurs s'aggravent,
ou si vous ne pouvez plus plier ni étendre le genou.

Signs That a Consultation is Needed

Persistent pain: See a doctor if the pain lasts for several days without improving, or if your knee gives out, locks up, or swells. Recurring episodes.

Functional Limitation: Limping when walking. Difficulty with stairs. Prolonged sitting is painful (typical of patellofemoral pain syndrome). Limited sports or recreational activities. It affects your work.

Post-Injury Symptoms: Pain after a fall, twist, or impact. Immediate or progressive swelling. Feeling of instability (knee giving way). Joint locking (often related to the meniscus).

Other symptoms: Recurrent swelling. Persistent morning stiffness.

Direct Access to a Physiotherapist

In Quebec, you can see a physiotherapist directly, without a doctor's referral. The physiotherapist will assess your condition, provide a diagnosis, and begin treatment. If needed, they will refer you to a doctor.

Benefits: Quick consultation without waiting for a medical appointment. Immediate start of treatment. Shorter delays lead to better results.

People who seek help quickly are 8 times less likely to develop chronic pain.

When to See a Doctor Instead of a Physiotherapist?

There are red flags that require a medical evaluation:

Signs of infection or serious pathology: Fever with knee pain (possible infection). Severe nocturnal pain unrelated to movement (tumor, rare but must be ruled out). Unexplained weight loss. History of cancer.

Severe trauma: Suspected fracture (unable to bear weight on the leg, visible deformity). High-energy trauma (car accident, fall from a significant height). Severe immediate pain after trauma.

If you have any of these signs, see a doctor or go to the emergency room first.

When is Imaging Necessary?

Imaging is not always necessary. A clinical examination is often sufficient for diagnosis and treatment. X-rays confirm osteoarthritis. MRI is useful for meniscal tears or when conservative treatment fails. Incidental findings of patellar cartilage lesions are not necessarily related to knee pain.

How does physiotherapy treat knee pain, and is it effective?

Physical therapy combines manual therapy, therapeutic exercises, and patient education. This approach is just as effective as medication for knee osteoarthritis. ² First-line physical therapy is one of the main treatments for hip or knee osteoarthritis.

Manual therapy

A significant reduction in pain occurs after 3 weeks of manual therapy. ³ Manual therapy combined with exercises reduces knee pain and improves function.

Therapeutic Exercises

The benefits of an exercise program are lost after six months if you stop exercising. That is why it is important to continue with maintenance exercises.

Education and advice

• Managing Pain in Daily Life
• Modifying activities that cause problems
• Importance of staying active
• Realistic Expectations
• Learning to manage knee osteoarthritis on your own—through exercise, pacing your activities, and adopting healthy habits—can improve function, reduce pain and stiffness, and enhance your quality of life.

Complementary approaches

• Braces (Orthoses): stabilize the knee
• Aquatic exercises: reduce stress on joints

For osteoarthritis, treatment combines exercises, education, and, if necessary, weight loss. Every kilo lost reduces the load on your knees.

Effectiveness demonstrated by research

Studies show a 75-85% success rate for treating knee pain with physiotherapy. ⁴ The combination of therapeutic exercises, manual therapy, and education is particularly effective in reducing pain and improving function.

The effectiveness of treatment depends on several factors: how early you seek care (the sooner, the better the results), consistency in doing home exercises, the type of condition (meniscus injury, osteoarthritis, patellofemoral syndrome), and quadriceps strength. A comprehensive evaluation allows us to tailor treatment to your specific situation. Strengthening the hip—not just the knee—helps people with knee pain. Stronger hip muscles improve leg mechanics and reduce stress on the knee.

Most patients notice improvement within the first 3-4 weeks, with complete resolution in 8-12 weeks. ⁵

Are you suffering from knee pain? Book an appointment for a comprehensive evaluation and a personalized treatment plan.

What exercises help relieve knee pain?

Exercise relieves pain and improves knee function, especially in the short term.

Our guide to physical therapy for knee pain describes the evaluation process and exercises.

Can You Treat Knee Pain Yourself?

Self-treatment can relieve mild knee pain (ice, rest, gentle stretches). However, without a precise diagnosis (meniscus vs. osteoarthritis vs. patellofemoral pain syndrome), exercises can worsen certain conditions. Without an accurate diagnosis, you risk maintaining compensations or doing counterproductive exercises that delay healing.

A physiotherapist uses clinical tests to identify the affected structure and adapts treatment accordingly. An evaluation helps identify the exact cause, rule out red flags, and create a progressive treatment plan. Exercises are tailored to your specific condition, not generic.

Our approach: professional assessment + supervised home exercise program = better long-term results.

Are you hesitating between self-treatment and a consultation? Free 15-min consultation to discuss your situation.

How long does recovery take, and how can recurrence be prevented?

The duration depends on the cause. Minor pain goes away in a few days. A sprain takes several weeks to heal, depending on its severity. Osteoarthritis requires long-term management. To learn how to manage chronic pain, see our guide.

Factors Influencing Recovery

• Severity of the Injury
• Age
• Physical Condition
• Adherence to the exercise program
• Timing of Consultation

How to Prevent Knee Pain

Maintain a healthy weight: every extra kilo adds 4 kg of pressure on your knees. Stay active, strengthen your muscles, and warm up. Movement nourishes cartilage.

Weight Management:

• Every extra kilo exerts 4 kg of additional pressure
  
• Losing 5 kg reduces the load by 20 kg with every step
  
• Weight loss reduces pain and prevents the progression of osteoarthritis

Exercise and Physical Activity:
Movement nourishes the cartilage through synovial fluid. It prevents stiffness and strengthens the muscles. A program of 2 to 3 sessions per week protects your knees. Exercise doesn't just relieve knee pain; it also affects your mood and has a moderate effect on depression.

Warm-up and Recovery:

• Warm up for 5 to 10 minutes before activity
  
• Gradually prepare your joints.
  
• Allow yourself recovery time

Limit activities that cause pain. If you're unsure, consult a physiotherapist.

What are the frequently asked questions about knee pain?

Should you apply heat or cold?

Après une blessure récente, le froid est facultatif : utilisez-le s'il vous soulage. Appliquez du chaud pour la raideur, tensions musculaires ou Chronic pain.

Is it normal for my knee to crack?

Cracking sounds without pain are harmless. If accompanied by pain, swelling, or locking, consult a professional. Cracking is common with osteoarthritis but does not predict worsening.

Can I exercise with knee pain?

Yes, adjust the intensity. Mild pain is acceptable. Avoid exercises that significantly increase your pain. Movement helps promote healing.

Can knee osteoarthritis improve?

Cartilage doesn't regenerate, but symptoms can improve. Exercise and education are as effective as medication. Weight loss also offers benefits. Discover why osteoarthritis isn't always the cause of pain.

Do I need an MRI?

Not necessarily. A clinical examination is often enough. An MRI confirms meniscal injuries or is used if conservative treatment fails. For osteoarthritis, an X-ray is sufficient.

References

1. Crossley KM, Stefanik JJ, Selfe J, et al. 2016 Patellofemoral pain consensus statement from the 4th International Patellofemoral Pain Research Retreat. Br J Sports Med. 2016;50(14):839-843. doi:10.1136/bjsports-2016-096384↩ Back to text
2. Fransen M, McConnell S, Harmer AR, et al. Exercise for osteoarthritis of the knee. Cochrane Database Syst Rev. 2015;1:CD004376. doi:10.1002/14651858.CD004376.pub3↩ Back to text
3. Deyle GD, Henderson NE, Matekel RL, et al. Effectiveness of manual physical therapy and exercise in osteoarthritis of the knee. Ann Intern Med. 2000;132(3):173-181. doi:10.7326/0003-4819-132-3-200002010-00002↩ Back to text
4. Collins NJ, Barton CJ, van Middelkoop M, et al. 2018 Consensus statement on exercise therapy and physical interventions for patellofemoral pain from the 5th International Patellofemoral Pain Research Retreat. Br J Sports Med. 2018;52(18):1170-1178. doi:10.1136/bjsports-2018-099397↩ Back to text
5. Skou ST, Roos EM, Laursen MB, et al. A randomized, controlled trial of total knee replacement. N Engl J Med. 2015;373(17):1597-1606. doi:10.1056/NEJMoa1505467↩ Back to text

Nos physiothérapeutes ont défini la stratégie de recherche, le plan et le contenu clinique de cet article. Un outil d’IA a soutenu la recherche documentaire et la révision du texte pour assurer une cohérence du contenu et du style d’écriture.

This guide was written by the Physioactif team. For a personalized assessment, book an appointment with one of our physiotherapists.