16 April 2015

What's your diagnosis? - Case 7: swollen knee

In this week's case we meet a very concerned mother with a five year old boy who presents with a swollen knee after falling off of his bike. Grab your patella hammer and help solve this week's case.


A very concerned Mrs B took her five year old son, child A, to the GP with a painful, swollen right knee. The boy had fallen off his bike the day before and has been unable to walk since the swelling started.

According to Mrs B, the child has had no fever episodes since the injury and had no previous episodes of painful joints.  Except for the odd bruise here and there, seasonal colds and flu, and the occasional nosebleed, Child A is generally healthy and has never had any hospitalisation or surgeries.

On examination, the GP found a swollen, painful right knee which was warm to the touch. He was very concerned as he thought there might be an infection in the knee (septic arthritis).

The doctor admitted the boy to hospital for evaluation but, on admission, he struggled to place an intravenous line. He became particularly concerned when he noticed that the sites where he attempted to place the drip would not stop bleeding.

What is your diagnosis?

What’s your diagnosisJoin the guesswork on our Facebook page, or comment below. 

NOTE: Health24's on-site GP Dr Owen Wiese will reveal new cases on Thursdays. We'll post the answer with the story on Mondays, or you can get it via the Daily Tip – sign up here.

Previously on What's Your Diagnosis

What's your diagnosis? -  Case 1: vomiting and weight loss

What's your diagnosis? -  Case 2: eye pain

What's your diagnosis? -  Case 3: strange behaviour and a bullet in the back

What's your diagnosis? -  Case 4: seeing odd things

What's your diagnosis? - Case 5: mysterious lungs

What's your diagnosis? - Case 6: runner with seizures


Read Health24’s Comments Policy

Comment on this story
Comments have been closed for this article.

Live healthier

Watch out! »

Gross fungal infections you can pick up at the gym

You go to gym to exercise. But make sure the only thing you pick up is a dumbbell and not one of these gross fungal infections.

Holiday health »

Your 10-step asthma holiday checklist

Don’t let asthma ruin your summer holiday. Whether you are travelling or embracing the summer at home, make sure you plan ahead.