31st January 2024

A 13-year-old presents to A&E with a red, hot, tender, swollen knee.

A 13-year-old presents to A&E with a red, hot, tender, swollen knee. He reports that he knocked it on the banister at home 2 hours ago. This is his 6th presentation to A&E this year with injuries following seemingly minor injuries, but he develops significant bruises, which have caused a safeguarding investigation in the past, which was closed without any concerns. He has 3 sisters who are well, and his mum and stepfather are well and seem to be genuinely worried about him. He is otherwise systemically well.

What is the likely cause of his knee injury?

Select the SINGLE most appropriate option from the list below. Select ONE option only.