Why Does One Knee Hurt More Than the Other? Dr. Mayur Rabhadiya Explains
- Dr. Mayur Rabhadiya
- 6 days ago
- 12 min read
By Dr Mayur Rabhadiya, Orthopedic & Joint Replacement Surgeon in Mumbai
Why Does One Knee Hurt More Than the Other?
Many patients experience pain in both knees but notice that one knee is consistently more painful than the other. In some cases, both knees show arthritis on an X-ray, yet only one side significantly affects walking, stair use, sleep, or daily activities.
This difference is common.
Knee pain is not determined by an X-ray alone. It is influenced by joint alignment, inflammation, muscle strength, previous injury, cartilage wear, meniscus condition, walking pattern, activity level, and individual pain sensitivity.
This is why both knees should be assessed separately. Even when arthritis is present in both knees, the two joints may not require the same treatment.
For a detailed overview of arthritis assessment and staged treatment, read:
Why Can One Knee Be More Painful Than the Other?
The knees may look similar from the outside, but they do not always experience the same amount of loading, wear, injury, or muscular support.
One knee may have:
More advanced arthritis
Greater cartilage loss
More inflammation
Worse bow-leg or knock-knee alignment
Weaker supporting muscles
A previous injury
Greater meniscus damage
More patellofemoral wear
Reduced movement
Higher mechanical stress during walking
As a result, one knee may become painful earlier or cause greater functional limitation than the other.
The correct treatment depends on identifying which of these factors is primarily responsible for the symptoms.
Arthritis May Be More Advanced in One Knee
Knee osteoarthritis develops when the smooth cartilage covering the joint surfaces gradually deteriorates.
As cartilage becomes thinner, patients may experience:
Pain while walking
Stiffness after sitting
Swelling
Difficulty climbing stairs
Reduced knee movement
Grinding or crepitus
Increasing bow-leg or knock-knee deformity
Arthritis does not necessarily progress at the same rate in both knees.
One knee may have greater joint-space narrowing, more cartilage loss, more bone spur formation, or greater deformity. This knee may therefore cause more pain during weight-bearing activities.
However, arthritis severity on an X-ray does not always directly match the amount of pain experienced by the patient.
This is why knee arthritis treatment should be based on the combination of symptoms, function, examination findings, alignment, and imaging.
Learn more about the available stages of knee arthritis treatment in Mumbai:
Similar X-Rays Do Not Always Mean Similar Pain
Two knees may show a similar degree of arthritis on an X-ray but still produce very different symptoms.
This happens because an X-ray mainly shows:
Joint-space narrowing
Bone alignment
Bone spurs
Deformity
Changes in the bone around the joint
An X-ray does not fully show every factor that contributes to knee pain.
Symptoms may also be influenced by:
Synovial inflammation
Joint fluid
Bone stress
Meniscus irritation
Muscle weakness
Patellofemoral overload
Soft-tissue sensitivity
Altered pain processing
One knee may therefore be much more painful even when the radiological appearance of both knees is similar.
Treatment decisions should not be based on the X-ray alone.
The aim is not simply to treat what is visible on the image. The aim is to understand why one knee is causing more pain, instability, stiffness, or loss of function.
Knee Alignment May Be Worse on One Side
Alignment affects how body weight passes through the knee joint.
When the leg is normally aligned, weight is distributed relatively evenly across the knee. When alignment changes, greater pressure may pass through one part of the joint.
Bow-Leg Alignment
Bow-leg alignment is also known as varus alignment.
In this condition, greater pressure commonly passes through the inner part of the knee.
This may contribute to:
Inner knee pain
Medial compartment arthritis
Uneven cartilage loss
Reduced walking tolerance
Progressive deformity
Difficulty standing for long periods
If one leg has more pronounced bow-leg alignment than the other, that knee may become more painful.
Knock-Knee Alignment
Knock-knee alignment is also known as valgus alignment.
In this condition, greater pressure commonly passes through the outer part of the knee.
This may contribute to:
Outer knee pain
Lateral compartment arthritis
A feeling of instability
Uneven cartilage wear
Difficulty walking
Difficulty climbing stairs
One knee may have more advanced alignment changes even when both knees have arthritis.
Alignment is therefore an important part of evaluating patients with unequal knee pain.
One Leg May Be Weaker Than the Other
The quadriceps muscles at the front of the thigh are essential for knee control.
They help with:
Standing from a chair
Walking
Climbing stairs
Descending stairs
Maintaining balance
Controlling knee movement
Preventing sudden knee buckling
When one leg is weaker, the knee may experience poorer control and increased strain.
Patients may notice:
Pain while rising from a chair
Difficulty using stairs
Faster fatigue in one leg
Reduced confidence while walking
A feeling that the knee may give way
Unequal weight distribution
Weakness often develops because the painful knee is used less.
This can create a cycle:
Knee pain reduces activity.
Reduced activity causes muscle weakness.
Weakness reduces knee control.
Poor control increases pain and instability.
The patient avoids activity further.
The opposite knee may also become overloaded because it compensates for the weaker or more painful side.
This is why physiotherapy should assess both legs rather than focusing only on the side that hurts more.
A Previous Injury May Affect One Knee More
A previous injury may cause one knee to deteriorate faster than the other.
Relevant injuries may include:
Meniscus tears
Ligament injuries
Patellar dislocation
Cartilage injuries
Fractures around the knee
Previous sports injuries
Repeated occupational strain
Even an injury that occurred many years earlier may affect present-day knee function.
For example:
An old ligament injury may contribute to instability.
A previous meniscus injury may reduce shock absorption.
A fracture may change knee alignment.
Cartilage damage may accelerate arthritis.
Inadequate rehabilitation may leave one leg weaker.
These changes can contribute to post-traumatic arthritis in the affected knee.
Patients should therefore mention all previous knee injuries during an orthopedic assessment, even when the injury occurred several years or decades earlier.
Meniscus Damage May Be Greater in One Knee
The menisci are fibrocartilage structures located inside the knee.
They help:
Distribute body weight
Absorb shock
Improve joint stability
Protect the cartilage
Support smooth movement
A meniscus may become damaged because of:
A twisting injury
Age-related degeneration
Repeated squatting
Existing knee arthritis
Previous trauma
Meniscus-related symptoms may include:
Pain along the joint line
Swelling
Catching
Locking
Pain while twisting
Difficulty fully bending the knee
Difficulty fully straightening the knee
If one knee has greater meniscus damage, that side may become more painful.
However, a degenerative meniscus tear may coexist with knee arthritis. The tear should not automatically be assumed to be the only cause of pain.
Treatment depends on:
The patient’s age
The pattern of symptoms
The degree of arthritis
The presence of locking or catching
Examination findings
Functional limitation
Response to non-surgical treatment
Not every meniscus finding on an MRI requires surgery.
Inflammation May Be Greater in One Knee
Arthritic pain is not caused only by cartilage loss.
Inflammation inside the joint may be much greater in one knee.
A more inflamed knee may develop:
Swelling
Warmth
Stiffness
Pain after walking
Pain after prolonged standing
Restricted movement
Pain during the first few steps
Increased discomfort at night
Inflammation may fluctuate from day to day.
Patients may notice worsening pain after:
Increased walking
Travel
Prolonged standing
Repeated stair climbing
A sudden increase in exercise
Long periods of inactivity
This explains why one knee may become significantly more painful even when the structural arthritis appears similar in both knees.
Treatment may need to focus first on reducing inflammation before progressing to strengthening or other interventions.
Patellofemoral Problems May Affect One Knee More
The patellofemoral joint is the joint between the kneecap and the thigh bone.
Pain from this area is commonly felt at the front of the knee.
It may worsen during:
Stair climbing
Stair descent
Squatting
Rising from a chair
Prolonged sitting
Driving
Sitting with the knee bent for a long time
One kneecap may track less smoothly than the other because of:
Muscle imbalance
Knee alignment
Hip weakness
Anatomical differences
Previous injury
Patellofemoral arthritis
Patellofemoral wear may also be more advanced in one knee.
In many cases, treatment begins with:
Activity modification
Quadriceps strengthening
Hip muscle strengthening
Flexibility exercises
Weight management
Medication when appropriate
Movement correction
Walking Pattern May Overload One Knee
Patients often change how they walk because of pain.
They may:
Lean away from the painful side
Take shorter steps
Keep one knee stiff
Rotate one foot outward
Place more weight on the opposite leg
Avoid bending one knee
Spend less time standing on the painful leg
These compensations may temporarily reduce discomfort in one knee but increase stress on the other.
Over time, the opposite knee, hip, ankle, or lower back may also become painful.
A gait assessment can help identify whether one knee is being overloaded because of:
Muscle weakness
Joint stiffness
Deformity
Pain avoidance
Reduced balance
Compensation for the opposite knee
Correcting the walking pattern may therefore be an important part of treatment.
Daily Activities May Load One Knee More
Many everyday habits are asymmetrical.
Examples include:
Using the same leg first while climbing stairs
Standing mainly on one leg
Carrying weight on the same side
Using one leg more during exercise
Leading with the same leg while standing up
Repeatedly using one foot to operate pedals
Sitting with one leg folded
Turning repeatedly toward the same side
These habits may increase unequal loading, especially when arthritis, deformity, or weakness is already present.
Patients are often unaware that they repeatedly depend on the same leg during daily activities.
A clinical assessment may reveal these movement patterns and help guide appropriate correction.
Pain Sensitivity May Differ Between the Knees
Pain is influenced by both the knee joint and the nervous system.
Some patients experience considerable pain despite moderate changes on X-ray. Others may have advanced radiographic arthritis but relatively manageable symptoms.
Pain may be influenced by:
Joint inflammation
Muscle weakness
Sleep quality
Stress
Physical deconditioning
Long-standing pain
Reduced confidence
Nervous system sensitivity
This does not mean the pain is imaginary.
It means that pain is biologically complex and cannot be measured only by looking at an X-ray.
The patient’s symptoms and functional limitations remain important when selecting treatment.
Does More Pain Mean More Damage?
Not always.
More severe pain may be related to:
Greater arthritis
More inflammation
Muscle weakness
Meniscus irritation
Bone stress
Patellofemoral overload
Joint stiffness
Increased pain sensitivity
Conversely, a knee with advanced arthritis on an X-ray may sometimes cause less pain than expected.
The clinical importance of knee pain depends on how it affects:
Walking distance
Stair use
Sleep
Work
Exercise
Balance
Independence
Quality of life
Treatment should therefore focus on symptoms and function rather than the radiological grade alone.
How Is Unequal Knee Pain Evaluated?
A proper orthopedic assessment should examine both knees.
Medical History
The doctor may ask:
Which knee hurts more?
Where exactly is the pain?
When did it begin?
Was there a previous injury?
Is the pain worse while walking?
Is the pain worse on stairs?
Is there swelling?
Does the knee lock or catch?
Does the knee buckle?
Is there pain at night?
How far can the patient walk?
Which treatments have already been tried?
Clinical Examination
The examination may assess:
Knee alignment
Swelling
Tenderness
Range of movement
Quadriceps strength
Ligament stability
Meniscus-related signs
Patellar movement
Hip strength
Walking pattern
Balance
Both knees should be compared directly.
Weight-Bearing X-Rays
Weight-bearing X-rays may help assess:
Joint-space narrowing
Bone spurs
Alignment
Deformity
Compartment-specific arthritis
Patellofemoral changes
Weight-bearing images are important because they show how the joint behaves while supporting the patient’s body weight.
MRI
MRI may be considered when symptoms are not fully explained by the X-rays or when a clinically important meniscus, ligament, cartilage, or other soft-tissue problem is suspected.
MRI is not automatically required for every patient with knee pain.
Should Both Knees Receive the Same Treatment?
No.
Each knee should be treated according to its own:
Symptoms
Examination findings
Arthritis stage
Alignment
Muscle strength
Functional limitation
Response to previous treatment
For example:
One knee may need strengthening.
The other may need inflammation control.
One knee may improve with physiotherapy.
The other may benefit from an injection in a selected situation.
One knee may have significant deformity.
The other may have only early cartilage wear.
One knee may require surgical evaluation.
The other may remain manageable without surgery.
Treating both knees in exactly the same way simply because both show arthritis may lead to unnecessary or inadequate treatment.
Non-Surgical Treatment Options
Many patients can initially be treated without surgery.
The treatment plan may differ for each knee.
Activity Modification
Patients may be advised to temporarily reduce activities that repeatedly increase pain, such as:
Deep squatting
Repeated stair climbing
Long-distance walking during an active flare
High-impact exercise
Prolonged standing
The aim is not complete inactivity.
Appropriate movement remains important for joint mobility, circulation, muscle function, and confidence.
Physiotherapy
A structured physiotherapy program may include:
Quadriceps strengthening
Hip muscle strengthening
Flexibility exercises
Balance training
Gait correction
Functional training
Improving knee movement
The exercise program may differ between the two legs depending on pain, weakness, stiffness, and alignment.
Weight Management
When relevant, weight management may reduce the mechanical load passing through both knees.
Reducing excess weight may help improve:
Walking tolerance
Stair use
Exercise capacity
Pain control
Overall mobility
Medication
Pain-relieving or anti-inflammatory medication may be considered depending on:
Age
Medical history
Kidney function
Stomach health
Heart condition
Other medicines
Medication should be individualized and should not be taken continuously without appropriate medical guidance.
Injection-Based Treatment
Selected patients may be considered for injection-based treatment.
Suitability depends on:
The diagnosis
Arthritis stage
Degree of inflammation
Patient age
Symptom severity
Previous treatment
Functional goals
GFC therapy may be considered in selected patients with suitable-stage knee arthritis.
However, no injection should be promoted as a universal solution or as a guaranteed method to regrow severely lost cartilage.
When Is Knee Replacement Considered?
Knee replacement may be considered when one knee has:
Advanced arthritis
Persistent pain despite appropriate treatment
Major difficulty walking
Severe stair limitation
Pain disturbing sleep
Progressive deformity
Significant loss of function
Reduced quality of life
Consultation with a knee replacement surgeon does not mean that surgery will automatically be advised.
The purpose of the consultation is to determine:
Whether the arthritis is truly advanced
Whether symptoms match the imaging findings
Whether non-surgical options remain reasonable
Whether partial or total knee replacement is appropriate
Whether surgery is likely to provide meaningful functional improvement
Learn more about knee replacement evaluation in Mumbai:
One knee may require replacement while the other continues to be managed without surgery.
Can Only One Knee Be Replaced?
Yes.
When one knee has advanced arthritis and severe functional limitation, while the other knee remains manageable, only the more symptomatic knee may require surgery.
The decision should be based on:
Pain severity
Walking limitation
Deformity
Arthritis stage
Response to conservative treatment
Patient health
Patient priorities
The presence of arthritis in the opposite knee does not automatically mean that both knees require replacement.
For information about knee replacement planning and available techniques, visit:
Does the Less Painful Knee Also Need Treatment?
The less painful knee may still benefit from preventive care.
This may include:
Strengthening
Weight management
Maintaining flexibility
Avoiding repeated overload
Monitoring deformity
Treating inflammation
Correcting gait where possible
However, treatment should always be proportional to symptoms and functional limitations.
An abnormal X-ray alone is not a reason to perform surgery.
When Should You Consult an Orthopedic Specialist?
You should consider an orthopedic evaluation when:
One knee remains persistently more painful
Pain is gradually worsening
Walking distance is reducing
The knee repeatedly swells
There is locking or catching
The knee gives way
Sleep is disturbed
Stairs are becoming difficult
The knee is becoming bowed or knock-kneed
Pain started after an injury
Home treatment has not helped
Daily independence is being affected
Prompt assessment is particularly important when there is:
Severe swelling
Inability to bear weight
Fever
Redness
Major trauma
A locked knee
Frequently Asked Questions
Why Does My Right Knee Hurt More Than My Left Knee?
The right knee may have more arthritis, inflammation, weakness, alignment abnormality, meniscus damage, previous injury, or mechanical overload.
A clinical examination is required to identify the main cause.
Can Both Knees Have the Same Arthritis Grade but Different Pain?
Yes.
Two knees can show a similar degree of arthritis on X-ray but cause very different symptoms.
Inflammation, muscle strength, alignment, walking mechanics, meniscus involvement, and pain sensitivity may differ between the knees.
Should Both Knees Be Injected Together?
Not automatically.
Each knee should be assessed separately. The indication, expected benefit, and suitability of an injection may differ between the two sides.
Can One Knee Need Replacement While the Other Does Not?
Yes.
One knee may have advanced, symptomatic arthritis while the other remains manageable with physiotherapy, activity modification, medication, or selected injections.
For further information about surgical assessment, visit:
Can the Less Painful Knee Become Worse Because I Depend on It More?
Yes.
Compensating for a painful knee may increase stress on the opposite side.
Strengthening, gait correction, weight management, and appropriate treatment of the more painful knee may help reduce this imbalance.
Does More Knee Pain Always Mean More Arthritis?
No.
Pain may also be influenced by inflammation, muscle weakness, meniscus irritation, alignment, joint stiffness, and pain sensitivity.
X-rays should therefore be interpreted together with symptoms and examination findings.
Conclusion
One knee may hurt more than the other because the two joints may differ in arthritis severity, alignment, inflammation, muscle strength, previous injury, meniscus condition, and mechanical loading.
Even when X-rays appear similar, symptoms may be very different.
The correct approach is to evaluate each knee separately and match treatment to the actual cause of pain and functional limitation.
One knee may improve with physiotherapy, activity modification, medication, or a selected injection. The other may require more advanced treatment if arthritis is severe and daily function is significantly affected.
The goal is not to treat both knees identically.
The goal is to understand why each knee hurts and choose the most appropriate treatment for that individual joint.
For more information about knee arthritis treatment:
For knee replacement assessment in Mumbai:
About Dr Mayur Rabhadiya
Dr Mayur Rabhadiya is an Orthopedic and Joint Replacement Surgeon in Ghatkopar, Mumbai, with a focused clinical practice in:
Knee arthritis assessment and staged treatment
Non-surgical knee arthritis care
GFC therapy in selected patients
Robotic and conventional knee replacement
Partial knee replacement
Revision knee replacement
Hip replacement surgery
📞 8424-903-913 | 9611-3300-63
This article is intended for patient education and does not replace an individual medical consultation.
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