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Hoffa Syndrome: Causes, Symptoms and Treatment

Hoffa syndrome is an inflammation or irritation of the infrapatellar fat pad located beneath the kneecap, causing knee pain, swelling, and limited movement.

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Things worth knowing about "Hoffa syndrome"

Hoffa syndrome is an inflammation or irritation of the infrapatellar fat pad located beneath the kneecap, causing knee pain, swelling, and limited movement.

What is Hoffa Syndrome?

Hoffa syndrome (also known as infrapatellar fat pad syndrome or Hoffa disease) is an inflammatory condition affecting the infrapatellar fat pad (Corpus adiposum infrapatellare), a specialized fatty tissue located beneath the kneecap (patella) inside the knee joint. This fat pad acts as a natural shock absorber and stabilizer for the knee. When it becomes irritated, impinged, or inflamed, it causes the characteristic pain and discomfort associated with Hoffa syndrome. The condition was first described by the German surgeon Albert Hoffa in 1904.

Causes

Hoffa syndrome can develop due to a variety of causes:

Acute trauma: A direct blow or fall onto the knee can injure the fat pad and trigger inflammation.
Chronic overuse: Repetitive knee movements common in running, cycling, or jumping can cause ongoing irritation of the fat pad.
Impingement: During certain knee movements, the fat pad can become pinched between the femur (thigh bone) and tibia (shin bone) or beneath the patella.
Malalignment of the knee: Structural issues such as knock knees or bowlegs increase the risk of fat pad impingement.
Post-surgical changes: After knee surgery, such as anterior cruciate ligament (ACL) reconstruction, the fat pad may develop scar tissue, sometimes referred to as a cyclops lesion.
Knee osteoarthritis: Degenerative joint disease can secondarily affect the infrapatellar fat pad.

Symptoms

Common signs and symptoms of Hoffa syndrome include:

Pain below the kneecap that worsens when the knee is fully extended
Swelling and tenderness on either side of the patellar tendon
Stiffness and pain after prolonged sitting or resting (start-up pain)
Discomfort when climbing stairs or walking downhill
Reduced ability to fully straighten the knee in severe cases
Occasional clicking or catching sensation in the knee during movement

Diagnosis

The diagnosis of Hoffa syndrome is based on a combination of clinical examination and imaging studies:

Clinical examination: The physician checks for tenderness below the kneecap and performs the Hoffa test, in which pressure is applied to the fat pad on both sides of the patellar tendon while the knee is extended.
Magnetic Resonance Imaging (MRI): MRI is considered the gold standard for diagnosis, reliably identifying edema, fibrosis, scarring, and signs of inflammation within the fat pad.
Ultrasound: Ultrasound examination can visualize swelling and structural changes in the fat pad and is a useful complementary tool.
X-ray: Conventional radiographs are primarily used to exclude bony abnormalities or calcifications within or around the fat pad.

Treatment

Conservative Treatment

In the majority of cases, Hoffa syndrome can be managed successfully without surgery:

Rest and activity modification: Reducing or modifying activities that aggravate knee pain is an important first step.
Ice therapy: Regular application of ice to the knee helps reduce swelling and pain.
Physiotherapy: Targeted strengthening of the quadriceps muscle and stretching exercises reduce load on the fat pad and improve joint stability.
Anti-inflammatory medications (NSAIDs): Medications such as ibuprofen or diclofenac can provide short-term relief from pain and inflammation.
Corticosteroid injections: In persistent cases, a guided injection of a corticosteroid into the fat pad can effectively reduce inflammation.
Patellar taping or bracing: Specific taping techniques or knee braces help to centralize the patella and reduce pressure on the fat pad.

Surgical Treatment

If conservative measures fail to provide sufficient relief after several months, surgical intervention may be considered:

Arthroscopic resection: During knee arthroscopy, the enlarged or scarred portion of the fat pad is removed through minimally invasive surgery. This procedure is generally associated with a high success rate and rapid recovery.

Prognosis

The prognosis for Hoffa syndrome is generally favorable when diagnosed and treated early. Many patients achieve full relief from symptoms through conservative management alone. Following arthroscopic surgery, most patients are able to return to normal activities within a few weeks. Early diagnosis and avoidance of aggravating activities are key factors in a successful outcome.

References

Hoffa A. - Influence of the adipose tissue with regard to the pathology of the knee joint. Journal of the American Medical Association, 1904.
Saddik D., McNally E.G., Richardson M. - MRI of Hoffa's fat pad. Skeletal Radiology, 2004; 33(8): 433-444.
Jacobson J.A. - Fundamentals of Musculoskeletal Ultrasound. 3rd edition, Elsevier, 2018.

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