This practical text presents the most up-to-date information on the evaluation and management of all aspects of complex and revision shoulder arthroplasty, divided into three thematic section. Chapters in part I focus on the diagnosis and management of complex primary shoulder arthroplasty, including evaluation of humeral and glenoid bone deformity, computer-assisted surgical planning, stemless arthroplasty, anatomic and reverse TSA for severe glenoid erosion, post-traumatic sequalae and deltoid deficiency. The next section describes the diagnosis and management of failed replacements, including hemiarthroplasty, anatomic and reverse total shoulder arthroplasty. These chapters will focus on the initial evaluation and management, including imaging, laboratory work-up and the role of biopsies, covering the diagnosis and revision of a failed hemiarthroplasty; diagnosis and revision of a failed total shoulder arthroplasty; diagnosis and management of the failed reverse shoulder arthroplasty; management of the unstable TSA or RSA; diagnosis and management of the infected arthroplasty; treatment of periprosthetic fractures; salvage options (resection and arthrodesis) for failed arthroplasty. Part III presents specific surgical techniques utilized during revision shoulder arthroplasty, including surgical exposure, removal techniques for failed humeral components, revision of glenoid and humeral defects with bone grafts and augments, and the role of arthroscopic procedures.