What causes small hard lump under the knee?
Patient: I have a small hard lump (feels like bone) directly below my right kneecap.  It's not under or behind the kneecap, but below.  It does not hurt all all when I touch it, however, last night i felt intermittent pain sensations in the area as I laid in bed.  Also, I can only feel the hard lump when I bend me knee.Any thoughts would be greatly appreciated!  Thanks Doctor: Hi.Thanks for your query and an elucidate history.This can be problem with the tendon. There can be a fibrous band or a calcification of the tendon.This is confirmed by X-ray / Ultrasonography. Take an opinion of the Orthopedic Surgeon and follow his advise.