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Pes Anserinus – Anatomy and Syndrome Explained

The pes anserinus is an anatomical structure at the inner knee where three tendons converge on the tibia. Inflammation in this area causes characteristic medial knee pain.

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Things worth knowing about "Pes anserinus"

The pes anserinus is an anatomical structure at the inner knee where three tendons converge on the tibia. Inflammation in this area causes characteristic medial knee pain.

What is the Pes anserinus?

The pes anserinus (Latin: goose foot) is an anatomical structure located on the medial (inner) side of the knee joint. It takes its name from the fan-shaped, webbed appearance of three tendons that converge and insert together onto the upper medial surface of the tibia (shinbone), resembling the foot of a goose. Two variants are distinguished: the pes anserinus superficialis (superficial goose foot) and the pes anserinus profundus (deep goose foot).

Anatomy

The pes anserinus superficialis is formed by the tendons of three muscles:

Sartorius muscle
Gracilis muscle
Semitendinosus muscle

These muscles originate from the pelvis and thigh and insert together at the medial tibia. The pes anserinus profundus refers to the insertion area of the medial collateral ligament (MCL) at the same bony landmark. Between the superficial tendons and the MCL lies a fluid-filled sac called the anserine bursa, which reduces friction during knee movement.

Clinical Relevance: Pes Anserinus Syndrome

Pes anserinus syndrome (also known as pes anserinus bursitis or insertional tendinopathy) refers to a painful inflammatory condition affecting either the tendon insertions (tendinopathy) or the bursa (bursitis) in this region.

Causes

Overuse from activities such as running, cycling, or frequent stair climbing
Knee osteoarthritis (gonarthrosis), which is strongly associated with this condition
Obesity, which increases mechanical load on the medial knee
Diabetes mellitus, a recognized metabolic risk factor
Biomechanical malalignment such as genu valgum (knock knees) or flat feet
Direct trauma or repetitive microtrauma to the area

Symptoms

Pain on the inner side of the knee, typically 2–5 cm below the joint line
Tenderness on palpation of the tendon insertion
Pain aggravated by stair climbing, rising from a chair, or physical activity
Occasional swelling or local warmth over the affected area
Nighttime pain, especially in bursitis

Diagnosis

Diagnosis is primarily clinical, based on a thorough patient history and physical examination including targeted palpation of the medial tibial area. The following imaging studies may be used as supplements:

Ultrasound: Visualization of bursal fluid or tendon changes
MRI (magnetic resonance imaging): Detailed assessment of soft tissue structures, especially in unclear cases
X-ray: Used to rule out bony pathology or to assess the degree of knee osteoarthritis

Treatment

Conservative Treatment

The vast majority of patients respond well to conservative management:

Rest and activity modification to reduce mechanical stress on the affected area
Ice application to reduce local inflammation and pain
Physical therapy: Stretching and strengthening of the relevant muscles, and correction of biomechanical factors
Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac for pain relief and inflammation control
Corticosteroid injections into the bursa in cases of significant bursitis
Weight management in overweight or obese patients
Orthotic insoles to correct biomechanical malalignment

Surgical Treatment

Surgery is rarely required and is only considered in refractory cases that do not respond to conservative therapy. The procedure typically involves surgical removal of the inflamed bursa (bursectomy).

Prognosis

With consistent conservative treatment, the prognosis for pes anserinus syndrome is generally favorable. Most patients experience significant improvement within weeks to months. Addressing underlying conditions such as osteoarthritis or obesity is key to long-term recovery.

References

Rennie WJ, Saifuddin A. Pes anserine bursitis: incidence in symptomatic knees and clinical presentation. Skeletal Radiol. 2005;34(7):395–398.
Lowe W. Pes Anserine Bursitis and Tendinopathy. In: Orthopedic Massage. Elsevier, 2009.
Kang I, Han SW. Anserine bursitis in patients with osteoarthritis of the knee. Southern Medical Journal. 2000;93(2):207–209.

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