In case of a child presenting with knee pain exacerbated by activity, what should be monitored aside from duration of pain?

Monitoring the range of motion of the knee is crucial in a child presenting with knee pain that worsens with activity. Assessing the range of motion helps identify any limitations or restrictions that may indicate underlying conditions such as a ligament injury, meniscal tears, or joint effusion. It is important to establish whether the child can fully extend or flex the knee, as a reduction in range of motion can provide valuable diagnostic information and guide further evaluation and management.

While the other factors like family medical history, frequency of physical activity, and participation in sports can provide helpful context regarding the child's overall health and lifestyle, they do not directly assess the mechanical function of the knee joint, which is central to understanding the nature and cause of knee pain in this scenario. By focusing on the knee's range of motion, a more precise understanding of the problem can be achieved, aiding in determining the appropriate treatment path or necessary referrals, such as imaging studies if indicated.