What happened to Jacob's hip when God touched him during the wrestling?

When God touched the hollow of Jacob's thigh during the wrestling match, the thigh was put out of joint. He crippled Jacob, and Jacob walked with a limp for the rest of his life. The context states this happened as they wrestled until daybreak.

Les explains that God literally came down in a theophany in the form of a man and wrestled with Jacob. When God saw that He did not prevail against Jacob, He touched the hollow of Jacob's thigh, and it was out of joint as he wrestled him. In other words, He crippled him, and Jacob walked with a limp for the rest of his life. Yet the important part is Jacob's response: he would not let go unless God blessed him, recognizing that without this God of Isaac and Abraham, he was destitute—unlike Esau, who was destitute of faith.

Genesis 32:25

And when he saw that he prevailed not against him, he touched the hollow of his thigh; and the hollow of Jacob’s thigh was out of joint, as he wrestled with him.

Why did God put Jacob's hip out of joint during the wrestling?

When God saw that He did not prevail against Jacob in the wrestling, He touched the hollow of Jacob's thigh, putting it out of joint and crippling him. The context stresses the important issue was not the resulting limp but Jacob's refusal to let go without receiving a blessing.