ABNORMALITIES OF THE KNEE AND LOWER LEG ABNORMALITIES OF THE KNEE AND LOWER LEG Many knee problems in children or adolescents are self-limiting. Others require surgical consideration to reduce the risk of later degenerative change. ABNORMALITIES OF THE KNEE AND LOWER LEG Many knee problems in children or adolescents are self-limiting. Others require surgical consideration to reduce the risk of later degenerative change. ABNORMALITIES OF THE KNEE AND LOWER LEG Many knee problems in children or adolescents are self-limiting. Others require surgical consideration to reduce the risk of later degenerative change.