ABOUT 80,000 to 250,000 anterior cruciate ligament (ACL) injuries of the knee occur annually, with many of these injuries affecting individuals between the ages of 15-25 years. I The majority of ACL injuries are noncontact in nature,23 with landing and plantand-cut maneuvers being the most common activities associated with it 4 Females participating in sports that involve jump landing and plant...

CONTEXT Total knee arthroplasty (TKA) is routinely performed in younger patients who desire to be active in fitness and recreational sports. The activities patients can participate in without symptoms and the level of aerobic fitness routinely maintained are important to investigate. OBJECTIVE To determine physical activity (PA) and recreational sports resumed after primary TKA, symptoms or l...

This study inventoried the types of developmental and negative experiences that youth encounter in different categories of extracurricular and community-based organized activities. A representative sample of 2,280 11th graders from 19 diverse high schools responded to a computer-administered protocol. Youth in faith-based activities reported higher rates of experiences related to identity, emot...