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
a
ac
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b
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).