Patellofemoral Pain Syndrome (Runner’s Knee): Causes and Treatment in the UK

Patellofemoral Pain Syndrome (PFPS), commonly referred to as 'Runner’s Knee', is one of the most frequent causes of knee pain in the UK. It is characterised by a dull, aching pain at the front of the knee and around the patella (kneecap). Despite its nickname, it does not only affect athletes; it is common among office workers, teenagers, and people who have recently increased their activity levels.

The condition occurs when the patella does not glide correctly in the trochlear groove of the femur (thigh bone). This misalignment causes increased pressure and friction on the cartilage behind the kneecap, leading to irritation and inflammation. In line with NHS evidence, PFPS is a 'clinical diagnosis', meaning a healthcare professional can usually identify it based on your symptoms and a physical history without the immediate need for expensive scans.

The pain associated with PFPS usually develops gradually rather than following a specific injury. You might notice the following:

• Pain during activity: A sharp or dull ache when running, jumping, or squatting.
• Stair climbing: Pain that is noticeably worse when going up or down stairs.
• The 'Movie Theatre Sign': Stiffness and aching after sitting for long periods with your knees bent.
• Crepitus: Gritting, grinding, or clicking sounds when bending the knee.
• Mild swelling: Occasional puffiness around the kneecap, though significant swelling is rare and may indicate a different issue.

PFPS is often a multi-factorial condition. According to UK clinical guidelines, the most common drivers include:

1. Overuse and Training Errors

Sudden increases in running mileage, intensity, or hill work can overload the patellofemoral joint before the muscles have time to adapt.

2. Muscle Imbalances

Weakness in the quadriceps (front of the thigh) or the hip abductor muscles (gluteus medius) can cause the kneecap to pull slightly out of alignment—a process known as 'maltracking'.

3. Biomechanics

Flat feet (overpronation) or high arches can change how the force of your step travels up to your knee, placing extra stress on the joint. High-heeled shoes can also exacerbate this issue by shifting the body's centre of gravity forward.

Most patients in the UK can manage Runner’s Knee effectively with conservative treatment. The primary goal is to reduce inflammation and correct the underlying mechanical cause.

• Relative Rest: You do not need to stop all movement, but you should avoid activities that provoke the pain until it settles.
• Ice: Applying a cold pack to the knee for 15 minutes after activity can help reduce local inflammation.
• Pain Relief: Over-the-counter paracetamol or non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen can be used for short-term relief, as per NICE guidance.
• Footwear: Ensure your trainers are not worn out and provide adequate arch support. Some patients find relief with orthotic insoles.

Physiotherapy is considered the 'gold standard' treatment for PFPS in the UK. A physiotherapist focuses on strengthening the 'VMO' (vastus medialis obliquus)—the inner part of the quadriceps—and the hip stabilisers. This helps to 'pull' the kneecap back into its correct groove. Stretching tight structures like the hamstrings, calves, and the iliotibial (IT) band is also vital for long-term recovery.

If your knee pain is persistent, preventing you from working, or failing to improve after two weeks of rest, it is advisable to speak to a GP online. An online consultation is a convenient way to discuss your symptoms from home.

A UK-registered doctor can help by:

• Providing a clinical assessment to rule out other conditions like meniscus tears or bursitis.
• Prescribing stronger anti-inflammatory medication if appropriate.
• Issuing a private sick note if your job involves heavy lifting or standing that you cannot currently perform.
• Referring you to a specialist physiotherapist or for imaging (like an MRI) if there are 'red flags' or if the pain is chronic.