This patient had suffered a fall and developed sudden anterior knee pain and inability to straight leg raise. Interesting just how much you can see on the plain films and how closely it correlates to the US findings.

Dr Jon Sharpe works at Yorkshire Radiology, who can be found on twitter @YorkshireRad

Further articles of interest

Sonography of Partial-Thickness Quadriceps Tendon Tears With Surgical Correlation (2003) Journal of Ultrasound in Medicine, 22:1323–1329