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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Pain In Knee And Lump Beneath Kneecap?

Please help.my 18 yo son has a very painfull knee.there is a pea sized lump that you can feel just beneath the knee cap which you can move around to the top of the cap. He has to push it to the side and the lump dissapears that reappears....this is ruining his chance at football academy....I ve taken him doctors and hospital all they say is do stretching exercises which is stupid as he s in so much pain. I do not know what to do....
Mon, 2 Mar 2015
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Pathologist and Microbiologist,  's  Response
Hi! when a person comes to me with any kind of knee pain with mobile lump under the knee cap, I usually get following possibilities as per imaging studies, clinical examination and needle biopsy experience:

1. recurrent patellar dislocation 30%

2. synovitis, tendinitis or bursa cyst 30%

3. benign tumors like chondromatosis, osteochondroma etc. 20%

4. loose bodies and forgotten old tears/fracture 10%

5. synovial herniation or vascular tumors 10%

Therefore, he needs rest of the knee involved and please see an orthopedic surgeon for an urgent opinion but please don't worry as this is benign, infective /inflammatory only and never malignant!

regards,
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What Causes Pain In Knee And Lump Beneath Kneecap?

Hi! when a person comes to me with any kind of knee pain with mobile lump under the knee cap, I usually get following possibilities as per imaging studies, clinical examination and needle biopsy experience: 1. recurrent patellar dislocation 30% 2. synovitis, tendinitis or bursa cyst 30% 3. benign tumors like chondromatosis, osteochondroma etc. 20% 4. loose bodies and forgotten old tears/fracture 10% 5. synovial herniation or vascular tumors 10% Therefore, he needs rest of the knee involved and please see an orthopedic surgeon for an urgent opinion but please don t worry as this is benign, infective /inflammatory only and never malignant! regards,