What are the usual causes of having a foreign body in the knee joint?

Question:

BF knocked knee badly and has been diagnosed with the above - they are going to drain it out (presumably under local anaesthetic?) next week. He banged it badly. Is the foreign body likely to be a piece of dislodged bone or tissue? Or something else? He didn't cut it, so it doesn't seem that anything (like a wood splinter for example) went in at the time. Being a chap he was in great pain and didn't ask too many questions at the time - so grateful for any medical advice :)

Answers:
Will undoubtedly be a piece of torn cartilage. The op is minor - small incisions no bigger than 7mm to take small endoscopic camera & 1 or 2 small hooks via other holes, to manipulate what needs to be removed or cut out. The surgeon watches the proceedings on a TV monitor - anything floating is washed out, anything torn is trimmed. Fluid inserted during surgery is then drained & a bandage applied. Take things easy for a few days depending on actual advice given after.

Sounds like a bone chip, unless he's been playing with a nail gun.

how can i take you seriously with a Muppet avatar.

.doo-doo-do-do do! phenomenon.

Usually a piece of dislodged cartilege, rarely a piece of chipped bone.

Dog "N"2 Cats, Is spot on!
I've had 2 arthroscopy operations, under general anaesthetic.
takes a couple of hours, no pain. up and driving the next day.
but i should'nt have!

What are the usual causes of having a foreign body in the knee joint?

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