12yr old boy knee pain

[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