Kids Health  Words to Know (Sports Medicine Glossary)  Words to
Know (Sports Medicine Glossary)    Abrasion: the wearing away of
something, as happens to skin when it gets scraped.  Anterior
cruciate ligament (ACL): a ligament that helps give the knee
stability — one of the four main ligaments in the knee joint
that connect to the shinbone and thighbone.  Achilles tendon: a
band of tissue that connects muscles to the heel bone.  Acute: a
rapidly developing condition. An acute medical condition comes
on quickly and often causes severe symptoms, but lasts only a
short time.  Acute traumatic injury: in sports, these injuries
usually involve a single blow from a single application of
force, like getting a cross-body block in football.    Buckle or
torus fracture: when one side of the bone bends, raising a
little buckle, without breaking the other side.    Chronic: a
condition that someone has for a long time or one that goes away
and keeps coming back. Diabetes and juvenile rheumatoid
arthritis, for example, are