NET
6 Then all the color drained from the king’s face and he became alarmed. The joints of his hips gave way, and his knees began knocking together.
Darby
6 Then the king's countenance was changed, and his thoughts troubled him, and the joints of his loins were loosed, and his knees smote one against another.
KJV
6 Then the king's countenance was changed, and his thoughts troubled him, so that the joints of his loins were loosed, and his knees smote one against another.