(1) Bridgman's Observational Results.-It was observed by Bridgman' that there is a linear relationship between the hydrostatic pressure p and the natural strain at fracture, i.e., the ductility, in tensile tests on steel cylinders, and that this relationship persists regardless of the type of fracture which occurs. A theoretical explanation of the foregoing result has been given in an earlier p...

BACKGROUND Occult femoral neck fractures associated with femoral shaft fractures are frequently missed and may lead to adverse outcomes. CASE PRESENTATION A 46-year old female presented to our institution with increasing groin pain one month after antegrade intramedullary nailing of a femoral shaft fracture at an outside hospital. Radiographic evaluation revealed a displaced ipsilateral femor...

BACKGROUND CONTEXT Although innumerable studies have analyzed the multiple aspects of osteoporotic vertebral fractures, no study has focused on the clinical features related to spine pain in patients with recent osteoporotic vertebral compression fractures (VCFs). PURPOSE To determine whether the assessment of pain-related behavior (P-RB) of patients with osteoporotic VCFs of recent onset may...

Based on the field measurements of the physical properties of fractured rocks, the anisotropic properties of hydraulic conductivity (HC) of the fractured rock aquifer can be assessed and presented using a tensor approach called hydraulic conductivity tensor. Three types of HC values, namely point value, axial value and flow direction one, are derived for their possible applications. The HC valu...

The use of increasingly precise, intelligent neurosurgery instruments that allow intraoperative accuracy, visualization, surgical access, has led to mastery of surgical techniques and the transformation of prognosis, the Mayfield three-pin skull clamp was designed to rigidly affix a patient's head to the operating table during craniotomy drilling and delicate microneurosurgery. However, these i...

Sixty-three fractures of the femur occurring in Paget’s disease of bone have been studied to elucidate the mechanism of fracture and to compare methods of treatment and results with those of other series. Although Paget’s disease is commonly symptomless, fracture, particularly of the femur, is one of the most frequent complications (Brailsford 1938, Lake 1951). Many small series offractures hav...

M e t h o d s Design: Prospective cohort study. Setting: 40 clinical centers in the United States. Participants: 40 657 women 65 to 79 years of age who did not have Parkinson disease and did not take medication for Parkinson disease or depression and were expected to survive and live in the same area for ≥ 3 years. Risk factors: Frailty, defined as having ≥ 3 of 5 frailty components: muscle wea...

RESULTS During the eleven-year period 1957-1967, the case records of 495 patients with fracture of the femoral neck were available for study. There were 120 male and 376 female cases; one female patient had fractures of both femora at different times and therefore there were 496 fractures included in the series. The diagnosis was confirmed radiologically in all cases. Fig. 1 shows the age distr...