This book addresses the background and significance of the factors potentially influencing the clinical and biological outcomes of metal-on-metal hip implants. Metal-on-metal bearings were introduced and evaluated as an alternative to other bearing couples, particularly metal-on-polyethylene, due to their enhanced wear resistance as determined in laboratory testing. Initially, reports of short-term clinical outcomes were favorable and an increasing number of metal-on-metal prostheses were implanted. Subsequently, isolated case findings describing adverse tissue responses around the articulation became the harbinger of an increasing number of reports describing pseudotumors and other significant lymphocytic-based responses associated with metal-on-metal prostheses. Questions have been raised as to whether this is an implant, design, or patient-specific response. The reasons why some patients have a negative biological response and pathology while others do not remain to be determined, but tens of thousands of patients in the US, the UK, and around the world are considered to be at risk. Leading researchers and clinicians describe the issues related to the nature of the biological and pathological responses and the protocols that should be followed to determine if an adverse response is occurring. This book is essential reading for researchers, engineers, and orthopaedic surgeons who are involved in the design, evaluation, and implantation of metal-on-metal prostheses.

This book addresses the background and significance of the factors potentially influencing the clinical and biological outcomes of metal-on-metal hip implants.Metal-on-metal bearings were introduced and evaluated as an alternative to other bearing couples, particularly metal-on-polyethylene, due to their enhanced wear resistance as determined in laboratory testing.Initially, reports of short-term clinical outcomes were favorable and an increasing number of metal-on-metal prostheses were implanted. Subsequently, isolated case findings describing adverse tissue responses around the articulation became the harbinger of an increasing number of reports describing pseudotumors and other significant lymphocytic-based responses associated with metal-on-metal prostheses. Questions have been raised as to whether this is an implant, design, or patient-specific response. The reasons why some patients have a negative biological response and pathology while others do not remain to be determined, but tens of thousands of patients in the US, the UK, and around the world are considered to be at risk. Leading researchers and clinicians describe the issues related to the nature of the biological and pathological responses and the protocols that should be followed to determine if an adverse response is occurring. This book is essential reading for researchers, engineers, and orthopaedic surgeons who are involved in the design, evaluation, and implantation of metal-on-metal prostheses."

This special issue will deal with various current, state-of-the-art, as well as novel approaches for the management of osteonecrosis. There are original research and review articles about this disease in the hip and knee ranging from cell-based therapies, bone grafting, osteotomies, to the use of pharmacologic agents such as bisphosphonates and iloprost and various prosthetic devices. In addition, better ways to learn about this disease and monitor outcome measurements will be reviewed. More difficult to recognize and treat diseases such as subchondral hip insufficiency fractures, bone marrow edema syndrome, and spontaneous osteonecrosis are also featured.

Osteonecrosis is a disease caused by reduced blood flow to bones in the joints, including the hip, knee, shoulder, and ankle. The disease, which is usually progressive and leads to joint failure, occurs in young adults aged from their twenties to their fifties. The pathogenesis of osteonecrosis is still unclear, and treatment remains controversial. This textbook provides up-to-date and comprehensive information on the pathophysiology, etiology, diagnosis, classification, and treatment of osteonecrosis. The role of various imaging modalities is considered, and both non-surgical and surgical treatment approaches are clearly explained. The contributions, all from experts in the field, are based on presentations at leading international meetings during the past 10 years and on peer-reviewed papers. The book will be of interest not only to clinical practitioners but also to those engaged in basic research.