You did a great job clearly summarizing the claim and backing it up with credible evidence. Your use of both Johns Hopkins and Harvard Medical School adds strong reliability, since both are respected medical institutions. You also effectively included the author’s credentials, which strengthens your evaluation of credibility. One area to improve would be to briefly explain why people often believe cracking knuckles causes arthritis — for example, to show how this myth contrasts with the scientific evidence. Overall, your paragraph is clear, factual, and well-supported, showing strong critical thinking and source evaluation.