. X-rays will show healing callus in an injury which is more than four weeks old, while doubters may respond to ultrasound testing by a physiotherapist – it causes real discomfort if positive!What else could it be?Few injuries show crescendo pain apart

.Medical investigations These are needed to eliminate other causes. If you’re old or have already suffered injury from contact sports, early osteo-arthritis may show up on an x-ray. Additionally, blood tests can reveal generalised diseases such as ankylosing spondylitis

. You may well have been a rugby or football player in the past, and have suffered previous knee injury.SignsYour doctor will be able to demonstrate your knee tenderness and find swelling. The McMurray test involves flexing and extending the knee slowly