What is Hoffas Fat Pad Impingement?

Knee pain can be confusing for runners because it comes in many forms. One lesser-known source is Hoffa's fat pad impingement, which affects the soft tissue just below the kneecap. This fat pad normally cushions the front of the knee, but when it becomes irritated or pinched, it can create sharp, localized pain that feels very different from general soreness after a run.

Runners often describe the discomfort as pain directly beneath or on either side of the kneecap, especially when the leg is fully straightened. The symptoms may worsen when running downhill, standing with the knee locked out, or after long runs that place repetitive stress on the front of the joint. Some also notice swelling, tenderness when pressing just below the patella, or a feeling of fullness at the front of the knee.

Because the fat pad is highly sensitive, irritation can linger if ignored. Unlike conditions such as patellar tendon pain, Hoffa's fat pad impingement tends to feel sharper and more pinching in nature. Recognizing these symptoms early can help runners better understand the cause of their knee pain and avoid setbacks in training.

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