The third section tackles broader themes like biotribology, regulatory aspects of joint replacements, examines noteworthy case studies like metal-on-metal hips, and addresses joint replacements not easily categorized in the previous sections, such as spinal total disc replacements. This book offers a critical assessment of the diverse and evolving design concepts currently in use, ranging from established metal-on-polymer joints to innovative biomimetic solutions. This book is designed to swiftly equip readers with a deep understanding of contemporary joint replacements and the immediate and long-term challenges they present.