hi welcome to HCM
as per discussion it seems that your son have jumper`s knee disorder
which is a – inflammation of the band of tissue that connects the kneecap (patella
) to the shin
only treatment is RICE METHOD.
E-elevation of affected leg
with painkillers.severe injury
may require immobilization splint/brace/cast
. You son may also need to do regular exercises to strengthen the muscles surrounding the knee
. Knee pads and shinguard will help to protect your son from injury.
i think this give you answer