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Prosthetic replacement with modular implants has become the most common reconstructive tech¬nique of bone loss of the lower limb after tumour resection. The use of the megaprosthesis in bone metastasis, silver-coated megaprosthesis and the use of Trevira tube are not uniform and represent an "open question" about the use of megaprosthesis. The following paper aims to review the current literature in this topic.

Cephalomedullary nailing (CMN) currently represents the best surgical technique for the treatment of intertrochanteric hip fractures. Although the success of CMN in terms of functional recovery and fracture healing, in clinical practice there are many complications. Later femur fracture following treatment of trochanteric fracture with CMN is not a very frequent complication but, when it occurs, its treatment is the most complex, because of the increase of peri-operative mortality. There are studies in literature, which have demonstrated that the incidence of this complication is about 0.5-3%. Diagnosis and classification are made with standard radiographs, using the AO classification and the modified Vancouver classification. In the actual literature, to determinate the predisposing factor to the secondary fractures, the authors focused their attention on patient-related and surgical related risk factors. The treatment is variable and it depends on the type and characteristics of fracture and device. Outcomes analyzed in literature were mortality and bone healing. The aim of this manuscript is to provide an overview of this topic and to describe the state of the art of the secondary fracture after surgical treatment with intramedullary nailing.

Müller-Weiss (MW) disease is a spontaneous osteonecrosis of the tarsal navicular bone in adults. It is a rare cause of chronic medial midfoot pain and deformity characterized by the collapse of the dorso-lateral part of the navicular, progressive navicular fragmentation and talonavicular joint destruction. This study provides a review of the literature about the epidemiology, etio-pathogenesis, clinical, radiological findings and therapeutic alternatives.

Pelvic fractures are quite uncommon, they represent only 2-8% of all fractures. Osteosynthesis with percutaneous trans-Iliosacral screw is recognized as one of the standard procedures for the treatment of unstable posterior pelvic ring lesions. Because of the high number of complications associated with the conservative treatment of these kind of lesions such as pain, limb heterometry, difficulty in walking and sexual disability, percutaneous fixation with trans-iliosacral screw has found wide use and has become very popular among orthopedic surgeons. This technique is indicated for the treatment of dislocations of the sacro-iliac joint, some types of sacral and iliac fractures or combinations of these lesions.