12yr old boy knee pain

[arunja]

I think you should think laterally than confined to the joint alone. Is there any injury to Qceps , may be a contusion may precipitate the same symptoms. We cannot also neglect the possibility of sup and inf bursae. MRI is good , so you can easily rule out the structure at fault.

[andyakers]

Have you considered Sindig-Larrson-johansson disease ?

This is similar to Osgood-Schlatters but occurs at the inferior pole of the patella. treatment is very similar.

MRI would be useful to confirm the presence of the condition.

[wutti]

hi, concerning to the fall on the knee, it might be infrapatellar bursitis and also hoffers fad pad might be inflamed. if tibial tuberosity is painfull, osgood schlatter might be the reason.
if you want to check lig (ACL) use lachmann test, you only need about 30 to 40 degrees od knee flex. Pcl gravity sign might be useful.

cheers