Randomized controlled trials (RCTs) are essential to evidence-based medicine, providing a trustworthy method for evaluating medical interventions. Primarily focused on drug therapies, RCTs now include surgical procedures, physiotherapy, and various other treatments. Their key feature is the random allocation of participants to treatment groups, which guarantees unbiased outcome comparisons. In orthopedics and sports medicine, RCTs inform best practices, significantly affecting patients’ quality of life. This chapter discusses the principles of RCTs, their historical development, and their status as a methodological gold standard. Important aspects of RCT design involve formulating research questions using the PICO framework (Population, Intervention, Comparison, Outcome), maintaining methodological rigor, and adhering to reporting standards such as the CONSORT guidelines to promote transparency and reproducibility. Successful RCT design requires a clearly defined research question, careful selection of the control group, and identification of relevant outcomes. Preregistering trial protocols in public registries enhances transparency and reduces bias. Adhering to established guidelines strengthens reporting standards and study reliability. Challenges faced in orthopedics and sports medicine RCTs include patient recruitment, ethical considerations, and long-term follow-up. Future directions focus on refining methodologies, incorporating emerging technologies, and addressing implementation challenges. By enhancing design and execution, RCTs will continue to advance clinical practice and patient care in these fields.