An adolescent child complains of night pain in the knee. It could be due to –a) Juvenile rheumatoid arthritisb) Idiopathic growth painc) Osteosarcomad) Paget's diseasee) Osteomyelitis
Causes of knee pain in adolescence 

Time of the knee pain helps in the diagnosis of the disorders : -

Night pain indicates
i) Inflammatory disorder → Juvenile rheumatoid arthritis.
ii) Bursitis, sinusitis
iii) Tumour → Osteosarcoma
Pain at the end of the day and after activity indicates
i)  Mechanical pain due to injury
Continuous pain present day and night indicates
i) Infection → Osteomyelitis, Septic arthritis
ii) Idiopathic adolescent anterior knee pain syndrome (Chondromalacia patella).
a
ac
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b