Knee Pain: Causes, Symptoms, Exercises and Physiotherapy Treatment
Knee pain is a common musculoskeletal problem that can affect people of different ages. It may occur after an injury, sports activity, repetitive stress, prolonged inactivity, or as a result of changes in the knee joint over time.
Knee pain can make everyday activities such as walking, climbing stairs, sitting down, standing up, or exercising difficult. Some people experience pain only during activity, while others may have stiffness, swelling, or discomfort even at rest.
Physiotherapy can play an important role in the assessment and rehabilitation of many knee problems. Depending on the cause and individual assessment, treatment may include education, exercise therapy, strengthening, mobility work, activity modification, and progressive rehabilitation.
This article explains the common causes and symptoms of knee pain, the role of physiotherapy, exercises, and when professional medical assessment is recommended.
Medical Disclaimer: This article is intended for general educational purposes only. It does not replace an individual examination, diagnosis, or treatment plan from a qualified healthcare professional.
What Is Knee Pain?
Knee pain refers to discomfort felt in or around the knee joint.
The knee is a complex joint that allows us to perform activities such as:
Walking
Running
Climbing stairs
Squatting
Sitting and standing
Jumping
Changing direction
Because the knee is involved in many daily and sporting activities, problems affecting the muscles, tendons, ligaments, cartilage, bones, or joint structures can sometimes cause pain.
The location and nature of knee pain can provide useful information, but a proper assessment is often needed to determine the likely cause.
Common Causes of Knee Pain
There are many possible causes of knee pain.
1. Knee Osteoarthritis
Osteoarthritis is a common joint condition that can cause knee pain, stiffness, and difficulty with movement.
Symptoms may become more noticeable during activities such as walking, climbing stairs, or prolonged standing.
Exercise and physical activity are important components of conservative management for many people with knee osteoarthritis.
2. Sports Injuries
Athletes and physically active individuals may develop knee injuries during running, jumping, twisting, or contact sports.
Common sports-related knee injuries include:
ACL injury
Meniscus injury
MCL injury
Patellar tendon problems
Knee sprain
The appropriate treatment depends on the type and severity of the injury.
3. Meniscus Injury
The menisci are structures inside the knee that contribute to load distribution and joint function.
A meniscus can be injured during twisting or other movements, particularly during sports activities.
Symptoms may include pain, swelling, clicking, or difficulty with certain movements.
4. Ligament Injuries
The knee contains several important ligaments that provide stability.
The anterior cruciate ligament (ACL) is particularly important in sports involving jumping, landing, sudden stopping, or changes of direction.
ACL injuries may require structured rehabilitation and, in selected cases, surgical management followed by rehabilitation.
5. Patellofemoral Pain
Pain around or behind the kneecap may occur in some individuals, particularly during activities such as:
Squatting
Running
Climbing stairs
Prolonged sitting
The causes can be multifactorial, and treatment should be based on an individual assessment.
6. Tendon Problems
Tendons around the knee can become painful when exposed to repeated or excessive loading.
For example, patellar tendinopathy can cause pain around the tendon below the kneecap and is commonly associated with jumping and sporting activities.
7. Muscle Weakness or Reduced Physical Capacity
Reduced strength or conditioning of the muscles around the hip and knee may contribute to difficulty performing certain activities.
A physiotherapist can assess strength and functional capacity and develop an appropriate progressive exercise programme.
8. Trauma
Falls, accidents, direct blows, or twisting injuries can cause different types of knee problems.
Significant trauma, severe swelling, inability to bear weight, or obvious deformity requires appropriate medical assessment.
Symptoms of Knee Pain
Knee problems may produce different symptoms depending on the underlying condition.
Common symptoms include:
Knee pain
Stiffness
Swelling
Difficulty bending or straightening the knee
Pain while climbing stairs
Pain during squatting
Difficulty walking
Clicking or other sensations
Feeling of instability or giving way
Reduced ability to participate in sports
The combination of symptoms and the circumstances in which they occur are important when assessing knee pain.
When Does Knee Pain Need Professional Assessment?
You should consider professional assessment when:
Pain persists or keeps returning
Knee pain is affecting daily activities
You are having difficulty walking
You cannot comfortably bend or straighten the knee
The knee repeatedly feels unstable
Swelling keeps returning
Pain is preventing you from participating in work or sports
A qualified physiotherapist or doctor can assess the problem and determine whether physiotherapy, further investigation, or referral is appropriate.
How Is Knee Pain Diagnosed?
Diagnosis starts with a detailed history and physical examination.
A healthcare professional may consider:
How the injury or pain started
Location of pain
Swelling
Range of movement
Muscle strength
Joint stability
Walking pattern
Functional activities
Previous injuries
Sporting or occupational demands
Imaging such as X-rays or MRI may sometimes be appropriate, depending on the suspected condition and clinical findings.
Imaging should be interpreted alongside the person's symptoms and examination rather than being considered in isolation.
Physiotherapy Treatment for Knee Pain
Physiotherapy treatment depends on the underlying condition, symptoms, physical capacity, and rehabilitation goals.
1. Assessment and Individualized Treatment
A physiotherapist can assess movement, strength, flexibility, function, and other relevant factors.
The rehabilitation programme should be individualized rather than based on a one-size-fits-all approach.
2. Exercise Therapy
Exercise is an important component of rehabilitation for many knee conditions.
Depending on the condition, exercises may target:
Quadriceps strength
Hamstring strength
Hip strength
Calf strength
Balance
Knee movement
Functional strength
Overall physical conditioning
Exercises should be progressed gradually according to the individual's response.
3. Quadriceps Strengthening
The quadriceps muscles play an important role in knee function.
Depending on the individual's condition, exercises such as controlled knee extensions, sit-to-stand movements, or progressive resistance exercises may be included.
4. Hip Strengthening
Hip muscle strength and control can be relevant to lower-limb movement and function.
Exercises may include appropriate forms of:
Hip abduction
Hip extension
Squats
Step exercises
The exercise selection should depend on the patient's assessment and goals.
5. Balance and Proprioception
Balance exercises can be particularly relevant during rehabilitation after certain injuries.
They may help an individual progressively regain confidence and control during functional activities.
6. Mobility Exercises
Some people may benefit from exercises designed to maintain or improve appropriate knee and lower-limb mobility.
The choice of exercises depends on the underlying problem.
7. Activity Modification
Temporary modification of activities that significantly aggravate symptoms may be useful.
However, prolonged complete inactivity is generally not the goal of rehabilitation.
The objective is usually to gradually restore normal activity and physical capacity.
8. Manual Therapy
Manual therapy may be used as an adjunct in selected cases.
It should be considered as part of an overall rehabilitation programme rather than as a replacement for active exercise and functional rehabilitation.
Exercises for Knee Pain
The most appropriate exercises depend on the cause of knee pain.
Some commonly used exercise categories include:
Straight Leg Raise
This can be used in some rehabilitation programmes to work the quadriceps without requiring substantial knee movement.
Sit-to-Stand
Controlled sit-to-stand exercises can help develop functional lower-limb strength.
Mini Squats
When appropriate, controlled partial squats can progressively challenge the muscles around the knee and hip.
Step-Ups
Step exercises can be introduced progressively to improve functional strength.
Glute Strengthening
Exercises targeting the hip and gluteal muscles can form part of rehabilitation for selected patients.
Calf Strengthening
Calf raises may be incorporated when appropriate to improve lower-limb strength and functional capacity.
Important: These exercises are examples, not a universal treatment programme. Exercise selection should take into account the diagnosis, symptoms, age, physical capacity, previous injuries, and rehabilitation goals.
If an exercise produces significant pain, swelling, instability, or other concerning symptoms, stop and seek professional advice.
Knee Pain While Climbing Stairs
Many people notice knee pain while climbing stairs.
Stair climbing places significant demands on the muscles and knee joint.
Pain during stairs can occur with different conditions, including osteoarthritis, patellofemoral pain, muscle weakness, or other knee problems.
Rather than assuming that one particular structure is responsible, a proper assessment can help identify contributing factors and guide rehabilitation.
Knee Pain During Squatting
Squatting requires coordinated movement of the ankle, knee, hip, and trunk.
Knee pain during squatting may be influenced by:
Strength
Mobility
Training load
Previous injury
Technique
Joint condition
Physical capacity
A physiotherapist can assess the movement and modify the exercise appropriately.
Knee Pain and Weight Management
Body weight can influence the mechanical load experienced by the knee during daily activities.
For people with knee osteoarthritis who are overweight or living with obesity, weight management may form part of an overall health and treatment strategy.
A sustainable approach involving appropriate physical activity, nutrition, and professional support can be considered when relevant.
Knee Pain After Exercise
Some muscle soreness after starting a new exercise programme can be normal.
However, persistent or significantly worsening knee pain, substantial swelling, repeated giving way, or loss of function should not simply be ignored.
A physiotherapist or doctor can help determine whether the exercise programme needs to be modified or whether further assessment is needed.
When Should You See a Physiotherapist?
A physiotherapy assessment may be useful if:
Knee pain is affecting your daily activities
You have difficulty walking or climbing stairs
You are unable to return to sports
You have reduced knee strength
You have stiffness or movement limitations
You have recurring knee pain
You are recovering from a knee injury or surgery
You need a structured rehabilitation programme
Physiotherapy can help restore strength, movement, function, and confidence through an individualized rehabilitation plan.
When Should You Seek Urgent Medical Attention?
Seek prompt medical assessment if knee pain is associated with:
Major trauma
An obvious deformity
Inability to bear weight after a significant injury
Severe or rapidly increasing swelling
A hot, very swollen knee with fever or feeling significantly unwell
Rapidly worsening symptoms
Significant neurological symptoms
The appropriate response depends on the circumstances, and urgent assessment may be required.
Frequently Asked Questions About Knee Pain
1. Can physiotherapy help knee pain?
Physiotherapy can help many people with knee problems by improving strength, movement, physical capacity, and function. The treatment depends on the underlying condition.
2. Which exercise is best for knee pain?
There is no single best exercise for every knee condition.
The appropriate exercises depend on the diagnosis, symptoms, physical capacity, and rehabilitation goals.
3. Is walking good for knee pain?
Walking can be an appropriate form of physical activity for many people, particularly when introduced at a comfortable and manageable level.
However, the appropriate amount depends on the individual's condition.
4. Can weak muscles cause knee pain?
Muscle weakness can contribute to difficulty with certain activities and may be one of several factors associated with knee problems.
A proper assessment is needed to determine the relevant factors in an individual patient.
5. Is knee pain always caused by arthritis?
No.
Knee pain can result from injuries, tendon problems, patellofemoral pain, ligament or meniscus injuries, osteoarthritis, and other conditions.
6. Do I need an MRI for knee pain?
Not necessarily.
The need for imaging depends on the symptoms, history, physical examination, suspected condition, and whether imaging would change management.
7. Can knee pain be treated without surgery?
Many knee conditions can initially be managed with non-surgical approaches such as exercise-based rehabilitation and activity modification.
However, some injuries or conditions may require surgical assessment.
The appropriate treatment should be determined after individual evaluation.
8. Can physiotherapy help after knee replacement?
Yes. Physiotherapy is an important part of rehabilitation following knee replacement surgery.
The programme may focus on:
Knee movement
Strength
Walking
Functional activities
Swelling management
Gradual return to daily activities
The rehabilitation programme should follow the surgical team's and physiotherapist's recommendations.
Conclusion
Knee pain can have many different causes, ranging from sports injuries and tendon problems to osteoarthritis and other joint conditions.
The most effective approach depends on identifying the factors contributing to the symptoms and addressing them appropriately.
Physiotherapy can play an important role through assessment, patient education, exercise therapy, strengthening, mobility training, balance work, activity modification, and progressive rehabilitation.
The goal of rehabilitation is not simply to reduce pain but also to improve strength, movement, physical capacity, confidence, and participation in everyday activities.
If knee pain is persistent, recurrent, severe, or interfering with your daily life, consult a qualified physiotherapist or appropriate healthcare professional for an individual assessment.
About the Author
Dr. Vijay Guleria, BPT, MPT (Orthopaedics)
Dr. Vijay Guleria is a physiotherapist with more than 20 years of professional experience in physiotherapy and orthopaedic rehabilitation.
He holds a Bachelor of Physiotherapy (BPT) and a Master of Physiotherapy (MPT) in Orthopaedics.
Dr. Vijay Guleria is also a Lifetime Member of the Indian Red Cross Society.
His professional interests include physiotherapy, musculoskeletal conditions, orthopaedic rehabilitation, patient education, and promoting awareness about the role of physiotherapy in healthcare.
Medical Disclaimer
The information provided in this article is for general educational and informational purposes only. It is not intended to replace a personal consultation, diagnosis, or treatment plan from a qualified healthcare professional.
Every patient is different. Exercises and treatment approaches that are appropriate for one person may not be appropriate for another.
If you have severe pain, significant swelling, inability to bear weight after an injury, an obvious deformity, fever with a hot and swollen knee, or other concerning symptoms, seek appropriate medical attention promptly.
References
National Institute for Health and Care Excellence (NICE) — Osteoarthritis in over 16s: diagnosis and management
National Institute for Health and Care Excellence (NICE) — Rehabilitation after traumatic injury
World Health Organization (WHO) — Musculoskeletal health
Author: Dr. Vijay Guleria, BPT, MPT (Orthopaedics)
Professional Experience: 20+ Years
Membership: Lifetime Member, Indian Red Cross Society
