A new test method has been developed to measure the resistance of dynamic fracture initiation in brittle materials under combined mode I/I loadings. The Brazilian disks with center-cracks have been fractured under oblique impact loadings in diarnetral-compression. The dynamic stress intensity factors of mode I and H are evaluated from the superposition integrals of the step response functions f...

Bisphosphonates are a class of drugs that prevent bone loss by decreasing bone resorption. They represent a major treatment for osteoporosis and other metabolic bone diseases. Recent reports suggest that a potential complication of long-term bisphosphonate therapy may be atypical insufficiency fractures of the femur. Concern exists about delayed union after fracture stabilization in patients ta...

BACKGROUND Percutaneous vertebroplasty (PVP) and percutaneous kyphoplasty (PKP) are effective procedures for the treatment of vertebral compression fractures (VCFs). However, recent studies have reported that secondary VCFs develop in patients after PVP or PKP treatment. This study aimed to investigate the clinical characteristics and management of secondary fractures after PVP or PKP. MATERI...

BACKGROUND Several factors are known to influence osseous union of femoral neck fractures. Numerous clinical studies have reported different results, hence with different recommendations regarding treatment of Pauwels III fractures: femoral neck fractures with a more vertically oriented fracture line. The current study aimed to analyze biomechanically whether this fracture poses a higher risk o...

Objective: The purpose of this study is to identify incidence of recurrent vertebral compression fracture after kyphoplasty and vertebroplasty in patients with osteoporotic vertebral compression fracture. Methods: We retrospectively reviewed medical records and radiographic findings including magnetic resonance imaging (MRI) of all consecutive patients who underwent kyphoplasty (21 patients had...

During revision surgical fixation of clavicle fractures and fracture nonunions, compression of the prominent neurovascular structures of the thoracic outlet can be an important potential complication. In this report, we describe the case of a manual laborer who had iatrogenic compression of the thoracic outlet of his dominant arm by fracture callus during revision surgery after multiple subacut...

Received March 5, 1984; accepted May 18, 1984. On physical examination, there was tenderness in the L 1 area. Neurologic examination was normal. Initial radiographs (fig. 1A) of the lumbosacral spine revealed a compression fracture of the L 1 vertebra; subsequent myelography demonstrated an extradural block at the same level. At surgery, a standard posterior exposure of the dorsal arches of T10...

We compared the outcome of closed intramedullary nailing with minimally invasive plate osteosynthesis using a percutaneous locked compression plate in patients with a distal metaphyseal fracture in a prospective study. A total of 85 patients were randomised to operative stabilisation either by a closed intramedullary nail (44) or by minimally invasive osteosynthesis with a compression plate (41...

Two Types of Fracture There' are roughly two main types of fracture of the waist of the carpal scaphoid. In type I there is a crack in the bone with negligible or no displacement, whilst in type II fractures there is an appreciable gap and some degree of displacement. The prognosis is best in type I and frequently the cartilage over the fracture line is intact. McLaughlin (1954) decided to trea...