Management of Spinal Trauma; Clinical Instability of Spine; The Occipital-Atlantoaxial Articulation; Cervical Spine Injuries; Toracolumbar Spine Injuries; Lumbar spine fractures; Pyogenic infections of the spine; Tuberculosis of the spine; Cervical spine rheumatoid arthritis; Surgical Treatment of Ankylosing Spondylitis in the Vertebral Spine; Diagnosis of Cervical Spine Tumors; Tumors of the thoracic and lumbar spine; Local Restitution of Pelvis; Pelvic Osteotomies for Dysplastic Hip Disease in Young Adults; Pelvic Ring Fractures; Hip dislocations and acetabular fractures; Intracapsular Fractures of the Femur; Prosthetic hip replacement for femoral neck fractures; Intertrochanteric fractures; Subtrochanteric fractures; Femur Axis Fractures; Surgical approaches to hip articulation; Diagnosis and Treatment of Ischemic Necrosis of Femoral Head; Osteotomies of the Hip; Intertrochanteric Osteotomy; Hip Arthrodesis; Femoral Head and Neck Excision Arthroplasty; Total hip replacement; Total hip arthroplasty: cemented operative techniques; Total hip reconstruction; Total hip arthroplasty: uncemented operative techniques; Hip Arthroplasty in Elderly Patients with Hip Dysplasias; Acetabular reconstruction in total hip replacement; Revisional Hip Arthroplasty; Total revision hip arthroplasty: Non-cemented; Special Prosthetic Replacement; Pelvic and Proximal Femoral Respiratory Surgery and Allograft Replacement; Hip Surface Replacement: The Porous Surface Replacement System.