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Hoffa Impingement: Causes, Symptoms and Treatment

Hoffa Impingement is an irritation of the infrapatellar fat pad in the knee joint, causing pain and swelling. It is typically caused by overuse or direct trauma.

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Things worth knowing about "Hoffa Impingement"

Hoffa Impingement is an irritation of the infrapatellar fat pad in the knee joint, causing pain and swelling. It is typically caused by overuse or direct trauma.

What is Hoffa Impingement?

Hoffa Impingement, also known as Hoffa Syndrome or infrapatellar fat pad impingement, is a painful condition involving irritation or entrapment of the infrapatellar fat pad (also called the Hoffa fat pad). This fatty tissue is located just below the kneecap (patella), between the patellar tendon and the underlying bone. It acts as a natural shock absorber within the front of the knee joint.

When this fat pad is repeatedly pinched between the bones of the knee, it becomes inflamed and painful. The condition was first described by German surgeon Albert Hoffa in 1904.

Causes

Hoffa Impingement develops due to mechanical irritation or entrapment of the fat pad. Common causes include:

Overuse from repetitive knee movements, such as in sports or physical labor
Acute trauma such as a fall onto the knee or a direct impact
Altered knee mechanics due to muscle weakness or imbalance
Anatomical factors that reduce the space available for the fat pad
Post-surgical changes following knee procedures
Degenerative changes associated with knee osteoarthritis

Symptoms

Typical symptoms of Hoffa Impingement include:

Pain below the kneecap, especially when fully extending the knee
Swelling in the front of the knee
Tenderness to the touch on either side of the patellar tendon
Increased pain when standing for long periods, climbing stairs, or during physical activity
An occasional sensation of catching or locking in the knee

Diagnosis

Diagnosis is typically made by an orthopedic specialist or sports medicine physician using a combination of clinical examination and imaging.

Clinical Examination

The Hoffa Test is a key diagnostic maneuver: the examiner applies pressure on both sides of the patellar tendon while the patient actively extends the knee. Pain during this test is a strong indicator of Hoffa Impingement.

Imaging

MRI (Magnetic Resonance Imaging): The gold standard for visualizing the fat pad and identifying edema, scarring, or inflammation
Ultrasound: Useful for detecting swelling and changes in the fat pad
X-ray: Used to rule out bony abnormalities

Treatment

Treatment depends on the severity of symptoms and typically begins with conservative (non-surgical) measures.

Conservative Treatment

Rest and activity modification to reduce stress on the knee
Ice application during acute flare-ups
Physiotherapy: Strengthening surrounding muscles and correcting movement patterns
Anti-inflammatory medications (e.g., NSAIDs such as ibuprofen)
Corticosteroid injections into the affected area for persistent symptoms
Taping or bracing to offload the kneecap

Surgical Treatment

If conservative treatment is unsuccessful, arthroscopic surgery may be recommended. During this minimally invasive procedure, the inflamed or scarred portion of the fat pad is partially removed (partial fat pad resection). Results are generally favorable, with most patients returning to full activity.

Prognosis

With timely treatment, the prognosis for Hoffa Impingement is generally good. Many patients respond well to conservative management. Following surgery, most individuals are able to return to sports and daily activities. Consistent physiotherapy plays a key role in long-term recovery and prevention of recurrence.

References

Hoffa A. - Influence of the adipose tissue with regard to the pathology of the knee joint. JAMA, 1904.
Dragoo JL, Johnson C, McConnell J. - Evaluation and treatment of disorders of the infrapatellar fat pad. Sports Med. 2012;42(1):51-67.
Osti L, Buda M, Soldati F, Del Buono A, Osti R, Maffulli N. - Arthroscopic resection of the infrapatellar fat pad. Br Med Bull. 2016;117(1):39-51.

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