'Joints' in the Bible

But a man drew his bow without taking special aim and struck the king of Israel through the joints of his armor. So he said to his charioteer, “Turn around and take me out of the battle, for I am badly wounded!”

But a man drew his bow without taking special aim and struck the king of Israel through the joints of his armor. So he said to the charioteer, “Turn around and take me out of the battle, for I am badly wounded!”

his face turned pale, and his thoughts so terrified him that his hip joints shook and his knees knocked together.