The starting point for the treatment of hip disease depends on how we can preserve the natural hip joint and on steps leading to regeneration of the diseased, injured, or destroyed joint. Preservation and regeneration treatments following traditional and theoretical methods do not need to use expensive materials such as the artificial joints used in arthroplasty. On the other hand, these treatments are difficult to perform and require a long rehabilitation period. The result has been a move away from traditional methods, denying the surgeon experience and knowledge of the benefits associated with the most biologically appropriate treatment. This book, a selection of the papers presented at the 32nd Japanese Hip Society (JHS) Congress, includes the latest knowledge on preservation and regeneration treatments as well as arthroplasty, and is an invaluable source of reference for all who work in the field of orthopedic surgery.