Injury to the ulnar collateral ligament of the metacarpophalangeal joint trips off the tongue more agreeably as gamekeeper's thumb.
手掌指骨的尺侧副韧带受的伤，通俗的说就是猎场看护人手指。
2
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.