These articulations with the fingers are the metacarpophalangeal joints known as the knuckles. Caning on the knuckles or shoulders is much less common. Primates can walk on their hands in other ways than on their knuckles. The attached blade protruded between the knuckles of the user. Lucia notices bruises on Jacky's knuckles and suspects he is responsible. Pain may occur in the palm of the hand or knuckles. His knuckles were nearly touching the ground. Sonic and Tails travel the island hindered by Knuckles and Robotnik. Upon being defeated by Super Sonic, Tails, and Knuckles, he reverts to his traditional appearance. "Rise of Lyric" sees players alternate control between Sonic, Tails, Knuckles and Amy. He has also been depicted using spiked knuckles. Brass knuckles are pieces of metal shaped to fit around the knuckles. Fossil remains have shown thick, developed front knuckles. DJs Frankie Knuckles and Joe Smooth performed regularly. He also has the words "stay gold" tattooed on his knuckles.