<prompt> An adolescent child complains of night pain in the knee. It could be due to a Juvenile rheumatoid arthritisb Idiopathic growth painc Osteosarcomad Pagets diseasee Osteomyelitisaacadb  <response>: Causes of knee pain in adolescence Time of the knee pain helps in the diagnosis of the disorders : -Night pain indicatesi Inflammatory disorder Juvenile rheumatoid arthritis.ii Bursitis, sinusitisiii Tumour OsteosarcomaPain at the end of the day and after activity indicatesi Mechanical pain due to injuryContinuous pain present day and night indicatesi Infection Osteomyelitis, Septic arthritisii Idiopathic adolescent anterior knee pain syndrome Chondromalacia patella. 