Upper extremities is radius and ulna it's your hand bone.
It’s normal,puberty,you can wax it professionally if you would like,it’s nothing bad
Answer:
It means when 2 bones grow closer to each other and causes pain. This procedure fuses, or “welds,” together the two bones that make up your aching joint. It causes the bones to become one solid bone, and it can lessen your pain.
Explanation: