I have just noticed a lump under my left kneecap, its very hard and its feels like some bone is sticking out, its about the size of a marble, not painfull but sore!
If anyone has ever had one of these I would be grateful to know what it is.

I don't know how you can detect a lump under your kneecap. A very hard cap to penetrate. Do you mean somewhere near your kneecap ?

Tick

I dont know how you can detect a lump under your kneecap. A very hard cap to penetrate. Do you mean somewhere near your kneecap ?

tick

Well just below the patella and at the top of the fibia

I can detect a small protrubence just below my kneecap, at the top of my tibia. It is an unusual place to be tender as it is not connected with a tendon or ligament. I suggest you go to your doctor, and possibly an x ray to see what this is.

tick

It might be the meniscus (below, not under, your kneecap) --

File:Knee diagram.svg - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/File:Knee_diagram.svg)

It might be the meniscus (below, not under, your kneecap) --

File:Knee diagram.svg - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/File:Knee_diagram.svg)

Yes, good call. Unfortunately trouble with that bone is big time and requires attendance. One of my clients has had it done at least twice with poor results. I am not glooming and dooming, but if this is the case OP should nip this in the bud before trouble starts.

Tick

Here's more information about the meniscus (tough cartilage), what the symptoms are if you tear it, and what can be done --

Meniscus Tear - Torn Cartilage (http://orthopedics.about.com/cs/meniscusinjuries1/a/meniscus.htm)