Pes Anserine Bursitis: Managing Inner Knee Pain in the UK

Pes Anserine Bursitis, also known as pes anserinus pain syndrome (PAPS), is a common condition characterised by inflammation of the bursa located between the shinbone (tibia) and the three tendons of the sartorius, gracilis, and semitendinosus muscles. These three muscles join together in a shape that resembles a goose's foot, which is where the Latin term 'pes anserinus' originates.

A bursa is a small, fluid-filled sac that acts as a cushion to reduce friction between tissues such as bone and tendon. When this sac becomes irritated or inflamed, it can cause significant discomfort and swelling on the medial (inner) aspect of the knee. In the UK, this is a frequently observed condition in both athletes—particularly runners—and older adults with pre-existing knee issues.

Recognising Pes Anserine Bursitis early can help prevent chronic irritation. The primary symptoms include:

• Inner Knee Pain: A burning or aching sensation on the inner side of your knee, usually two to three inches below the joint line.
• Tenderness to Touch: Significant sensitivity when pressing on the upper part of the shinbone.
• Aggravation with Activity: Pain that worsens when climbing stairs, rising from a chair, or during exercise.
• Night Pain: Discomfort that makes it difficult to sleep, especially when one knee rests on top of the other.
• Localised Swelling: A small lump or puffiness over the inner shin area.

Unlike a meniscus tear or collateral ligament injury, the pain isn't usually felt 'inside' the joint itself, but rather just below it. This distinction is vital for accurate diagnosis and management.

According to NICE (National Institute for Health and Care Excellence) clinical knowledge summaries, چندین factors can contribute to the development of this syndrome. In the UK, common triggers include:

Overuse and Repetitive Strain

Athletes, particularly distance runners and cyclists, are at higher risk due to the repetitive motion of the knee. Sudden increases in training intensity or poor technique can overwhelm the bursa.

Osteoarthritis

Many patients in the UK with knee osteoarthritis also develop pes anserine bursitis. The change in joint mechanics and inflammation within the knee often spreads to the surrounding bursae.

Biomechanical and Structural Issues

Those with 'knock-knees' (genu valgum) or flat feet (pes planus) often experience increased tension on the medial tendons, putting extra pressure on the bursa. Obesity is also a significant risk factor as it increases the mechanical load on the knee joint.

Most cases of Pes Anserine Bursitis respond well to conservative management at home. The 'RICE' protocol is the standard first-line approach recommended by the NHS:

• Rest: Avoid activities that aggravate the pain. Switch to low-impact exercises like swimming if necessary.
• Ice: Apply an ice pack (wrapped in a towel) for 15–20 minutes several times a day to reduce inflammation.
• Compression: A light tubular bandage may help if there is visible swelling.
• Elevation: Keep the knee raised when sitting to help fluid drain.

Over-the-counter medications such as paracetamol or non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen gel or tablets can be effective for symptom relief. Always consult a pharmacist before starting new medication to ensure it is suitable for you.

If your knee pain does not improve after two to three weeks of dedicated self-care, it is advisable to seek medical advice. Speaking to an online GP is a convenient way to discuss your symptoms and receive a professional assessment without leaving home.

During a GP consultation online, the doctor can review your clinical history, assess the location of your pain via video link, and provide guidance on the next steps. They can assist with:

• Prescription medication: Stronger anti-inflammatories if over-the-counter options aren't helping.
• Referrals: Directing you to NHS or private physiotherapy services for strengthening exercises.
• Differential Diagnosis: Ensuring the pain isn't caused by a stress fracture or a medial collateral ligament injury.
• Sick Notes: Providing documentation if your role involves heavy lifting or standing that you cannot currently perform.

Long-term recovery from pes anserine bursitis focuses on addressing the underlying cause. Physiotherapy is often the most effective route, focusing on stretching the hamstrings and strengthening the quadriceps. This balances the forces acting on the knee joint.

Preventative measures include wearing supportive footwear—especially if you have flat feet—and warming up thoroughly before exercise. For those with osteoarthritis, weight management can significantly reduce the frequency of bursitis flare-ups. In rare, recalcitrant cases where physiotherapy and rest fail, a GP may refer you for a corticosteroid injection into the bursa to settle the inflammation.