What Is Knee Pain?
Knee pain is a symptom rather than a diagnosis. The knee is the largest joint in the body. It is formed where the thigh bone (femur), shin bone (tibia) and kneecap (patella) meet. Its stability depends on a network of ligaments, including the cruciate and collateral ligaments. The menisci, meanwhile, act as shock absorbers, and the articular cartilage provides a smooth gliding surface. Surrounding muscles, tendons and bursae help the knee move and absorb load. Pain can arise from any of these structures. It can also come from the hip or lower back, referring discomfort down towards the knee.
Because so many structures are involved, knee pain behaves differently from person to person. It may be acute, appearing immediately after an injury. Or it may be chronic and gradually progressive, as often happens with osteoarthritis. Some people experience recurring episodes triggered by activity, with quieter periods in between. Others notice a slow decline in walking distance or an increasing reluctance to use stairs.
Establishing an accurate diagnosis matters because treatment differs considerably. A meniscal tear, patellar tendinopathy and early osteoarthritis can all cause pain on the inner or front of the knee. Yet each is managed in a different way. A careful assessment helps avoid unnecessary interventions and directs attention to the treatments most likely to help.
Common Symptoms
Symptoms can vary depending on the underlying cause, the structures involved and how long the problem has been present. Common symptoms may include:
- Aching, sharp or burning pain around the front, inner, outer or back of the knee
- Swelling, either immediately after an injury or fluctuating with activity
- Stiffness, particularly first thing in the morning or after sitting for long periods
- Difficulty fully straightening or bending the knee
- Clicking, grinding or catching sensations during movement
- A feeling of instability, giving way or lack of confidence on uneven ground
- Pain on stairs, when kneeling, squatting or rising from a chair
Some patients experience secondary effects such as disturbed sleep, altered walking pattern or reduced thigh muscle strength. Others notice discomfort in the opposite knee, hip or lower back as the body compensates. Symptoms often change with activity. Inflammatory and degenerative problems tend to ease with gentle movement but worsen after prolonged standing or heavy loading. Mechanical problems, such as a loose cartilage fragment, may cause sudden locking or catching.
The functional impact is often what prompts people to seek advice. Struggling to keep up on a walk, avoiding sport or finding work uncomfortable are all reasonable reasons to have the knee assessed. Relying regularly on painkillers is another.
Possible Causes and Risk Factors
Possible causes of knee pain include:
Degenerative and inflammatory conditions
- Osteoarthritis, in which the articular cartilage gradually thins and the joint becomes stiff and painful. Guidance from NICE emphasises exercise, weight management and education as core treatments for osteoarthritis.
- Inflammatory arthritis, such as rheumatoid arthritis, which may affect several joints and cause prolonged morning stiffness.
- Gout or pseudogout, which can cause sudden, intensely painful, swollen joints.
Injury and mechanical problems
- Meniscal tears, often from twisting, or degenerative tears that occur with less obvious trauma
- Ligament injuries, including anterior cruciate ligament and medial collateral ligament injuries
- Cartilage or bone injury following impact, including fractures
- Patellofemoral pain, tendinopathy of the patellar or quadriceps tendon, and bursitis
- Patellar instability or dislocation, sometimes linked to the shape and alignment of the joint
Risk factors
Risk factors can include increasing age, previous knee injury or surgery, and carrying additional body weight. Other factors include occupations involving heavy lifting, kneeling or repeated squatting, and sports with cutting, pivoting or jumping demands. Family history, leg alignment (bow legs or knock knees) and reduced muscle strength may also contribute. A rapid increase in training load is another factor. Occasionally, knee pain is referred from the hip, so both joints are usually considered together during assessment.
When to Seek Medical Advice
You should seek medical advice if symptoms are persistent, worsening, or following an injury. It is reasonable to arrange an assessment if:
- Pain has lasted more than a few weeks despite rest, activity modification and simple pain relief
- The knee is swollen, hot or red, or you feel generally unwell or feverish
- You cannot put weight on the leg, or the knee gives way or locks
- Symptoms are limiting work, sleep, exercise or independence
- Physiotherapy or other conservative treatment has not produced the improvement you hoped for
Urgent assessment is advised after significant trauma with obvious deformity, or an inability to move the joint. The same applies to a rapidly swelling and severely painful knee, as described in NHS guidance. These situations are uncommon, but they are worth acting on promptly.
How Knee Pain Is Diagnosed
Diagnosis begins with a conversation. Your clinician will ask how the pain started, where it is felt, and what makes it better or worse. They will also ask whether the knee swells or gives way, and how symptoms affect daily activities and work. Previous injuries, operations, medication and general health are all relevant.
A physical examination follows. This typically involves looking at leg alignment and walking pattern, assessing range of movement, and checking for fluid within the joint. It also involves palpating specific structures, and performing ligament and meniscal tests. Muscle strength and hip movement are often examined too, since weakness or hip pathology can influence knee symptoms.
Investigations are used selectively rather than routinely. Weight-bearing X-rays help assess joint space and alignment in suspected arthritis. An MRI scan may be considered when a soft tissue injury such as a meniscal or ligament tear is suspected. It may also help when the diagnosis remains unclear. Blood tests can help if inflammatory arthritis or infection is a possibility. Ultrasound, meanwhile, may be used for tendon or bursal problems. The purpose is always to confirm or refine the working diagnosis. Findings should then be explained to you in plain language alongside the realistic options.
Treatment Options and Management
Treatment depends on the cause and severity of symptoms, your age, activity level and personal goals. Most people begin with non-surgical care, and many improve without ever needing an operation. Options may include:
- Activity modification and load management: temporarily reducing aggravating activities while maintaining general fitness through cycling, swimming or walking on level ground.
- Physiotherapy-led rehabilitation: structured strengthening of the quadriceps, hamstrings and hip muscles, plus balance and flexibility work. Exercise therapy has good supporting evidence for knee osteoarthritis and patellofemoral pain, as summarised in reviews available through the Cochrane Library.
- Weight management: where appropriate, reducing load through the joint can lessen pain and improve function.
- Pain relief: your GP or consultant may discuss simple analgesia or topical anti-inflammatory preparations. This involves weighing benefits against possible side effects and other medical conditions.
- Injections: corticosteroid injections may provide temporary relief of inflammation in selected cases. They are usually combined with rehabilitation rather than used alone.
- Bracing, footwear or orthotics: occasionally helpful for instability or alignment-related pain.
- Surgery: considered when symptoms remain significant despite appropriate non-surgical treatment. It may also be considered when there is a structural problem unlikely to settle on its own. Options range from knee arthroscopy and cartilage preservation procedures to partial or total knee replacement, and in some cases revision surgery. Further background is available from the British Orthopaedic Association and Arthritis UK.
Surgery is not always needed and is never the automatic answer. Where it is discussed, the risks, expected recovery and likely benefits should be set out clearly. This helps you make an informed choice. Mr Shanmugasundaram Rajkumar uses ODEP 10A-rated hip and knee implants. He also records joint replacement outcomes through the National Joint Registry, supporting long-term monitoring of results.
Living With and Managing Knee Pain
Many knee problems are manageable long term with consistent self-care. Helpful measures include:
- Keeping the thigh and hip muscles strong with regular, progressive exercise rather than complete rest
- Pacing activity, building up gradually and avoiding sudden spikes in training
- Using supportive footwear and considering low-impact alternatives during flare-ups
- Applying ice or heat for short periods, whichever you find more comfortable
- Keeping a simple symptom diary noting pain levels, swelling and triggers, which is useful at review appointments
- Maintaining a healthy weight and staying generally active for overall joint and cardiovascular health
Flare-ups can happen even when the knee is well managed. Returning for review is sensible if symptoms change in character, or if swelling becomes persistent. It is also worth review if the joint starts giving way, or if your function declines despite doing your rehabilitation.
Why Choose Mr Shanmugasundaram Rajkumar?
Mr Shanmugasundaram Rajkumar is an experienced Consultant Trauma and Orthopaedic Surgeon. His practice specialises in hip and knee surgery, joint replacement and complex trauma care. With more than 16 years of consultant experience, he has particular expertise in total and partial knee replacement and hip replacement. His expertise also covers revision joint surgery, knee arthroscopy and cartilage preservation.
- Fellowship-trained in lower limb arthroplasty and knee surgery
- Honorary Senior Clinical Lecturer at the University of Glasgow
- College Tutor/Regional Surgical Advisor for the Royal College of Physicians and Surgeons of Glasgow
- Previous experience at Wrightington Hospital, a worldwide recognised centre for joint replacement surgery
- Experienced in day-case joint replacement and cartilage preservation surgery
- Active researcher involved in randomised controlled trials and UK and European multicentre studies, with publications in peer-reviewed orthopaedic journals
- Reviewer and consulting editor for international orthopaedic and surgical journals
- National lecturer and medical educator in Trauma & Orthopaedics
Consultations focus on a thorough, personalised assessment and an honest discussion of evidence-based options. This includes the choice not to operate where that is the more appropriate path.
Location and Areas Served
Patients can access specialist knee assessment with Mr Shanmugasundaram Rajkumar in Glasgow. Support is also available for people travelling from Renfrewshire and other surrounding parts of the west of Scotland. and across Scotland.
Frequently Asked Questions
What causes knee pain?
Knee pain may be caused by osteoarthritis, meniscal or ligament injuries, tendon problems or patellofemoral pain. It can also be inflammatory arthritis, gout or, less commonly, pain referred from the hip. An assessment helps identify which structures are involved.
Can knee pain get better on its own?
Often, yes. Many episodes settle within a few weeks with relative rest, gradual return to activity and strengthening exercises. Pain that persists, recurs or is associated with swelling or instability is worth having reviewed.
When should I see a specialist?
Consider a specialist opinion if symptoms have not improved after several weeks of conservative treatment, or if the knee locks or gives way. It is also worth an opinion if swelling keeps returning, or if pain is limiting work, sleep or exercise.
How is knee pain diagnosed?
Diagnosis is based on your history and a physical examination, supported where necessary by X-rays, MRI, ultrasound or blood tests. Investigations are chosen according to the suspected cause rather than ordered routinely.
Is surgery always needed?
No. Most people are managed successfully without an operation. Surgery is generally considered only when symptoms remain significant despite appropriate non-surgical treatment. It may also be considered when there is a structural problem that is unlikely to settle on its own.
Can knee problems come back after treatment?
Symptoms can recur, particularly with degenerative conditions or after a return to high-impact activity. Ongoing strengthening, sensible load management and periodic review help reduce the likelihood and severity of flare-ups.
Treatments for this condition
Seeing Mr Rajkumar
New Consultation
£180
Follow-up
£110
Clinics
Ross Hall Hospital, Glasgow
Referral
GP, insurer or self-referral
Get your knee assessed
An unhurried consultation with examination, imaging and a clear explanation.