Scapholunate ligament laxity on radiography without and with clenched fist (ie, power grip​)

An AP radiograph of the wrist following trauma (A) shows a scapholunate interval (arrow) of 1.1 mm. Image B is a radiograph performed during a power grip and shows an increase in the distance of the scapholunate interval (arrow) to 2.1 mm corresponding to stretching of the scapholunate ligament.