Fat Pad Impingement
What is fat pad impingement?
Also known as Hoffa syndrome, fad pad impingement is exactly what it sounds like: a pad of fat gets impinged upon, or affected, in some way. This particular fat pad is located behind the kneecap tendon and in front of the connective tissue of the knee joint (synovium). It has a rich supply of nerves, so when it is damaged, you will feel it.
(Why Hoffa? Albert Hoffa was a prominent German surgeon, orthopedist, and physiotherapist who lived in the late nineteenth century.)
If you have a sharp or chronic pain just under your kneecap that gets worse when you stand for too long, or hyperextending your knee, it is most likely because of fat pad impingement. There may be obvious swelling below and to both sides of the knee, and squatting or hyperextending your knee will cause pain. The area may feel warm, or full, as well.
Series of kicks that hyperextend your knee, standing for prolonged periods of time, or walking are simple causes of this condition. Women who wear high heels are also more liable to develop these symptoms.
Your physician will do a thorough physical exam, and will do some joint manipulation as well. “One test, called Hoffa’s Test, is to see if you can fully extend your knee while the tendon is being pressed on; patients with fat pad impingement will not be able to accomplish this because it will be too painful,” says John Dundon, MD, an orthopedic physician at OINJ. “Obviously we don’t push you to the point of pain, but this is an indicator as to what the underlying condition is that is causing it. To pinpoint the diagnosis, we may want to x-ray the area, or have you get an MRI.”
“Generally, ice — a lot of ice — will help bring down the swelling that results from the impingement. Rest, over-the-counter anti-inflammatories, and strength-building and stretch exercises are also usually advocated. Sometimes, the area can be taped so that the fat pad is not impinged on. If the condition does not resolve itself after these kinds of conservative methods, surgery may be an option,” says Dr. Dundon.
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John M. Dundon, MD – Orthopedic Physician
Board eligible with the American Board of Orthopedic Surgery, Dr. Dundon has expertise in hip and knee replacements, minimally invasive hip and knee arthroplasty, hip and knee arthroscopy, hip and knee preservation surgery, and rapid rehabilitation, short stay, and outpatient total joint arthroplasty.
Dr. Dundon completeda fellowship in adult reconstructive surgery with New York University and Insall Scott Kelley at the Hospital for Joint Diseases in New York City. He did his residency at, and received his medical degree from, Wright State University in Dayton, Ohio. His undergraduate degree was earned at the Ohio State University in Columbus.
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