Question

Patient aged 4-10 years old with insidious-onset hip or knee pain and an antalgic gait:

a) Osteosarcoma
b) Juvenile idiopathic arthritis (JIA)
c) Legg-Calvé-Perthes disease
d) Slipped capital femoral epiphysis (SCFE)

Answer 1

A patient aged 4-10 years old with insidious-onset hip or knee pain and an antalgic gait most likely has Legg-Calvé-Perthes disease, a condition resulting from avascular necrosis of the proximal femoral head.

Step-by-step explanation:

A patient aged 4-10 years old with insidious-onset hip or knee pain and an antalgic gait is most likely suffering from Legg-Calvé-Perthes disease (c). This condition, also known as Perthes disease, is idiopathic avascular necrosis of the proximal femoral head due to interruption of the blood supply. Other conditions mentioned, such as osteosarcoma, juvenile idiopathic arthritis (JIA), and slipped capital femoral epiphysis (SCFE), typically present differently or occur in different age groups. Perthes disease primarily affects children between 4 and 10 years of age and is characterized by limping and pain referred to the ipsilateral knee or anterolateral thigh.