Scapholunate Injury occurs when the ligament connecting the scaphoid and lunate carpal bones is torn due to a fall on a hyperextended wrist as can happen in skiing, BMX, skateboarding (full pipes more than street courses), motocross, ATV’s, snowboarding, in-line skating, football or basketball injuries.

Painful partial tears to the scapholunate ligament with no instability indicated can normally be treated with splinting or arthroscopic debridement, while more severe injuries resulting in instability and considerable gapping between the bones may demand arthroscopically assisted surgical pinning, ligament reconstruction, screw fixation or limited wrist arthrodesis.

Video description: The soft bulging tissue above between the lunate, left,
and scaphoid, right, represent a partial tear of the scapholunate
interosseous ligament. The shaver is used to trim and smooth the
surface of the tear. The fractured articular surface of the radius is below.