Finger (IMAGE) University of Alberta Caption Static images revealed normal metacarpophalangeal joints with the expected lack of any gaseous cavity prior to joint distraction [Figure 2]. Following the cracking event, static imaging with the addition of MCP distraction yielded a dark intra-articular void [Figure 2].) Credit University of Alberta Usage Restrictions Photo credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.